Product introduction and application examples

2024-01
EC-Z658

There are two types of building air-conditioning
systems, i.e., the individual air-conditioning systemused for medium-scale buildings (with a capacity of
10,000 m2 or less) and the highly automated central
heating, ventilation, and air-conditioning system(central HVAC control system for short) used forlarge-scale buildings (in excess of 10,000 m2).

This catalog explains installations that
constitute the central HVAC control
system and control devices thatproperly control the installations tocreate a comfortable living space.

Some products in this catalog are only available in Japanese market. Please contact us for further information.
MG CO., LTD.
(formerly M-System Co., Ltd.)
www.mgco.jp

6-0030Rev.

2

Introduction
Instrumentation devices developed for process automation (PA) have also been applied to factory automation(FA) and have greatly expanded the use of automation. They are now widely used for building automation(BA), including central HVAC control systems.
We developed the BA-dedicated Direct Digital Controller (DDC) and solved common problems to a great
extent in the general-purpose programmable logic controller (PLC).
Furthermore, we have prepared remote I/O modules specialized for building control and is convinced that its
instrumentation devices have come to the point where they can serve well for the design labor saving of every
BA system integrator (SI) and the systematic maintenance of BA.
We would like to recommend each SI to consider the adoption of our open network DDC and remote I/O
products.

Table of Contents
Chapter 1

Building Automation System (BAS) and Central HVAC Control

1-1

Building Automation System (BAS)

1-2

Central HVAC Control System

Chapter 2

Page 3
Page 4 to 5

Main Units Comprising Central HVAC Control

2-1

AHU (Air Handling Unit)

Page 6

2-2

VAV (Variable Air Volume)

Page 7

2-3

FCU (Fan Coil Unit)

Page 82-4Heat Source System

Page 9Chapter 3

Open Network for Air-conditioning Control System

3-1

Modbus Network Configuration

Page 10

3-2

LONWORKS Network Configuration

Page 113-3

BACnet Network Configuration

Page 11

Chapter 4

BA Components

4-1

Open Network DDC with Full of Useful Unique Functions Unavailable toGeneral-purpose PLCs

4-2

VAV-dedicated Open Network Controller (Model: BA9x-VAV)

Page 18

4-3

FCU-dedicated Open Network Controller (Model: BA9x-FCU)

Page 19

4-4

I/O Modules Dedicated to BA are Available for Remote I/O R3 Series

4-5

Remote I/O Compatible with BACnet Building Automation Network

Page 26

4-6

Open-network-dedicated Controllers (Multi-function PID Controller and Temperature Controller)

Page 27

4-7

Compact Linear Motion Electric Actuators MSP Series

Page 284-8Signal Conditioners and Other Products Generally Used for Air-conditioning Control

2Page 12 to 17

Page 20 to 25

Page 29 to 31

Chapter 1

1-1

Building Automation System (BAS) and Central HVAC Control

Building Automation System (BAS)You can make future
operation plans fromcollected data.

Example for Large-scale Building

Smartphone

Operation
Management
SystemBuilding Energy Management
System (BEMS)

Billing system• Abnormality report• Measurement data

PrinterInternet

The actual
operation of the
BAS is done
here.

LAN

Consolidated
Management
SystemServerWork station

PrinterWork station

Web server

LAN

Each installation
has a management
subsystem.

Field
Subsystem

Air
conditioning
Heat source
AHU
VAV
FCU
•
•

Electricity

Sanitary

Incoming
Water supply
and transforming and sewerage
Power board
Water pumping
Distribution board Toilet facilities••

Lighting
ONOFF
Dimming••••

A subsystem is provided to each of theinstallations of a large-scale building, including
the air-conditioning equipment, electric
equipment, and sanitation equipment, and theconsolidated management system is in control of
all the subsystems of the entire building.
In the case of
medium-scale or smaller buildings, it iscommon to use a system to control all the
installations, including air-conditioning
equipment, electric equipment, andsanitary equipment, grouped together.

3

Security

Disasterprevention

Door opening/closing Smoke extraction
Fire shutters
Locking
Sprinklers
Entry/Departure•
Security cameras•••

Explanations about thecentral HVAC control
system and theautomatic control of it
are provided from thefollowing page.

1-2

Central HVAC Control System

The central HVAC control system is an air-conditioning system, in which a heat source system, including boilers,chillers, and conveying pumps concentrated in one place, produces and sends chilled water, hot water, or steam
to the heat exchangers, e.g., air handling units and fan coil units (FCUs) on each floor, thus performing the coolingor heating of the entire building.
The central HVAC control system requires the initial cost and maintenance cost of the heat source system, andalso requires an installation space (usually on a basement floor). Therefore, it is adopted for relatively large-scale
office buildings, commercial facilities, hospitals, and hotels with a total floor area in excess of 10,000 m2. In urban
areas, the regional heating and cooling system is widely adopted as well, which receives chilled water, hot water,or steam from heat supply facilities (a district heating and cooling plant) and does not have heat source equipmentin the buildings.
In this catalog, the air handling unit is referred to as the AHU, the fan coil unit is referred to as the FCU, and thevariable air volume unit is referred to as the VAV, each of which is individually explained.

Cooling Towers

FCU

Fan Coil Unit

Partitioned meeting rooms
and areas on the windowside easily affected byoutside air are
air-conditioned individuallywith dedicated FCUs.

➞Page 8 Chapter 2 2-3
Hot/Chilled Water Piping
A cooling tower,
often seen on top of a building,is an installation that promotes
the heat dissipation ofcooling water for theunderground chiller.

Ceiling

Individual
Room

Individual
Room

The AHU sends cold air or
hot air to the entire floor.
Sub
MechanicalRoom

Ceiling

Air Ducts

AHU

Large
Space

VAV

Air Handling Unit

Variable Air Volume➞Page 6 Chapter 2 2-1➞Page 7 Chapter 2 2-2
In the case of a large floor space,
the VAV in the ceiling is used toair-condition each zone.

Hot/Chilled Water Piping

BoilerHeat Source System

Main
Mechanical
Room

Boiler➞Page 9 Chapter 2 2-4
Chiller
Most buildings have an
underground heat source system.
Pumps send chilled water andhot water from here to the entire
building.

Chiller4Basic Equipment for Central System[Legend][Glossary]

BACnet/IP
Modbus-RTU and BACnet MS/TP
Individual wiring
Chilled water supply pipe
Chilled water return pipe
Hot water supply pipe
Hot water return pipe
Cooling water supply pipe
Cooling water return pipe

AHU : Air Handling Unit (i.e., Air conditioner) ➞Page 6 Chapter 2 2-1
VAV : Variable Air Volume (Variable air volume unit) ➞Page 7 Chapter 2 2-2
FCU : Fan Coil Unit ➞Page 8 Chapter 2 2-3
DDC : Direct Digital Controller➞Page 12 Chapter 4 4-1

SCADA
BACnet/IP

Open Network DDC for
Gateways➞Page 12 Chapter 4 4-1

B

C

D
Fan

Cooling Towers

Outsideair
Fan

FCU Controller
FCU
Controller➞Page 19 Chapter 4 4-3

FCU

Individual
Room

Room Controller

RoomController
CD

DDC for AHU

VAV Controller➞Page 12 Chapter 4 4-1➞Page 18 Chapter 4 4-2

VAV
Controller

Ceiling

Fan

Hot water coils

FilterTo other rooms

Chilled water coils

Fan

Heat exchanger

Outsideair

Individual
Room

Supply Return➞Page 19 Chapter 4 4-3

Sub
Mechanical
Room

VAV

VAV

SupplyFan

RoomController

Room Controller

Supply➞Page 18 Chapter 4 4-2

AHU

ExhaustReturnMain
Mechanical
Room
Boiler

PA
DDC for Heat Source

Ceiling

FCU

Supply Return

B

ExhaustTo other FCUs

A

Heat exchanger

Modbus-RTU, BACnet MS/TP

Chiller

Chiller

Chiller

P

P➞Page 12 Chapter 4 4-1

5BoilerBoiler

Large
Space

Main Units Comprising Central HVAC Control

Chapter 2

2-1

AHU (Air Handling Unit)
AHU (Air Handling Unit)

Return/OutsideAir

SupplyAir

Supply Air Fan
Humidifier

Heating Coils
Cooling Coils
Air Filter

In order to create a comfortable living space that meets environmental standards, the AHU takes in outside air as well as air
returning from each room, filters the air, performs heat treatment, and supplies treated air for the air conditioning to eachroom.
The AHU is of unit construction with an air filter, air heat exchanger, humidifier, and supply air fan in a metal casing, and isusually installed in a dedicated machine room.

Exhaust damper
ExhaustReturnReturn air
damper

Supply duct

Steam

SupplyC

H

C

Chilled
water
coil
C

Outside air

Outside air
damperChilled water

Return air fan

Filter

SupplyReturnSupplyair fan

Hot
water
coil

Humidification
nozzleAHU

Hot water

There are various AHU control methods depending oneach space to be controlled and the application.

6

2-2

VAV (Variable Air Volume)
VAV

VAV Controller
Damper Motor
Air Duct

Airflow Speed
SensorDamperVAV
SupplySupplySupplySupplyCeiling

Ceiling Outlet Vents

RoomController

The VAV is used to control the temperature inside the room by varying the supply of air volume. It sends the required air
volume that corresponds to the current room temperature to the AHU controller. The AHU controller calculates the totalrequired air volume of each VAV unit and also controls the rotation speed of the air supply fan to minimize motive energy.
The VAV is installed in the ceiling of the room. A single AHU usually requires anywhere from five to twenty VAVs.

There will be no more
complaints about overly
cool areas and the system
also helps to reduce power
consumption.

Air volume: 100%
Air supply duct
Air volume: 50%
Comfortable!
CC

Air volume: 50%

Comfortable!

It’s too cold!

H

C

AHU

Fan rotation speed: 100% (Energy: 100%)

Air volume: 75%
Air supply duct
VAV

VAV

Air volume: 50%

Air volume: 25%

Comfortable!
C

C

Comfortable!

H

C

AHU

Fan rotation speed: 75% (Energy: 42%)

7

Comfortable!

The power consumption of
the motor is proportional tothe cube of the number of revolution.
For instance, if the revolution speedof the air supply fan is reduced from
100% to 75% with the inverter,
the power consumption will be
reduced by 58%.

2-3

FCU (Fan Coil Unit)
FCU

Coils
(heat exchanger)

4-pipe Type FCUFCU Controller
Fan

M
M

FCU
C

H

C

C

Fan

CeilingHeat Exchanger
Ceiling(coils)Supply Air

Supply Air

Return Air

Return Air

Supply Air

The FCU performs air conditioning in areas where temperature control is impossible only with the AHU, such as individuallypartitioned meeting rooms and areas on the window side easily affected by the outside air temperature. The FCU performs
only temperature control and cannot perform humidity control. Furthermore, the FCU circulates only air. The AHU or an
independent ventilator takes in fresh outdoor air.
There are two types of FCUs. One is a 4-pipe type that has independently a chilled water coil and hot water coil. The
other is a 2-pipe type that has a coil that serves for both chilled water and hot water.

Perimeter Zone and Interior Zone
A floor with large square footage is divided into a perimeter zone on the window side susceptible to outside air and an interior zone barely
affected by outside air.
In the perimeter zone, the air conditioning load differs between the south side exposed to sunlight and the north side not exposed to sunlight.
The air-conditioning load also changes greatly in separated rooms, such as meeting rooms, depending on whether they are occupied or not.
The FCU can control the temperature of each zone that cannot be done by an AHU only.

ELV

ELV

ELV

Common area

FCU

Perimeterzone

Separated
roomInterior zone

FCU

FCU

Interior zone
Perimeter FCU
zone
Separated room
Perimeter zone
FCU
FCU

FCU

FCU

8

FCU

FCU

2-4

Heat Source System
supplyHotreturnsupplyChilledreturnHeat
SourceEquipment

supplyHotreturnsupplyChilledreturnSEC SUPPLYHEADER

P

flow

M

P

return temp

bypass valve

SEC
pumps

SEC
pumps
boilerinlet temp

SEC RETURNHEADERPRI SUPPLY HEADER

hot water supply➞

supplypress

SEC SUPPLYHEADER

PRI RETURN HEADERPPPRI RETURN HEADER

Ao
flow

M

P

return temp

bypass valve

Do, Di

SEC RETURNHEADERPRI SUPPLY HEADER

chiller inlet
temp

Ai

BoilerDo, Dichilled water supply➞P

supplytemp

supply press

supply temp

Ai

BoilerP

BoilerP

P

P

ChillerP

ChillerP

Chiller

The central HVAC control system uses chilled water, hot water, or steam as a cooling or heating medium. The heat source
system uses a chiller or boiler to provide chilled water or hot water to be transported to the AHUs and FCUs in the building(if the heat source is steam, it is sent to each AHU through piping after the steam pressure is adjusted with a pressure
reducing valve. In this case, the steam is not sent to the FCUs because the FCUs do not use steam.). There are two typesof air-conditioning water piping for building air conditioning. One is an open piping system and the other is a closed piping
system (the above is an example of a closed piping system). The method of transporting chilled water or hot water varies
with each piping system. Each system performs high energy-saving controls, including control of the number of heat sourcemachines (e.g., chillers and boilers) and pumps, and the inverter-employed control of pump revolutions.

Open piping system

Closed piping system
Surge tank

AHU

AHU
Pressuresustaining valve

F CU
Supply header

Expansion tank

Check valve

F CU

Return header

Check valve

Supply header

Chiller
Pump

Return header
Pump

Chiller

Pump
Heat storage tankIn the case of the open piping system, water drips from the piping if the pump system stops operating. In that case, the pressure sustaining
valve is closed to prevent dripping. In the case of the closed piping system, water always remains in the piping, and no water drips with thesystem stopped.

9

Chapter 3

3-1

Open Network for Air-conditioning Control System
Modbus Network Configuration

SCADA

Modbus is a simple
protocol, and that is why
Modbus can be applied tocommunication withvarious devices.

SCADA

Modbus/TCP

A general-purpose
supervisory control anddata acquisition (SCADA)
can be used as a central
monitoring device.

GR8-EM

This DDC is dedicated to
AHU control.
Function blocks dedicated to air conditioning areavailable, which makes
programming easier.

DDC

I/O

I/O

BA3-CM20

BA3-CE10

Modbus-RTU

These controllers are
dedicated to VAV andFCU control.
They support various types
of VAVs and FCUs.

Dedicated controller
BA9M-VAV

BA9M-FCU
BA-RC2

BA-RC2

Modbus-RTU

We offer many types of
I/O modules dedicatedto BA.

Remote I/O
I/O

R3-NM1

I/O

I/O

R7 Series

R3-NE1

What is Modbus?
Modbus is a communication protocol developed by Modicon (now Schneider Automation International S.A.S.) for PLCs. The
specifications of Modbus are open to the public (*1). Modbus only defines a communication protocol and does not specify physicallayers, such as communication media. There are two Modbus communication methods, i.e., a method in RTU mode using binary
data and the other method in ASCII mode using character data. RS-232 and RS-485 are used as the physical layers of thesemodes. In addition, there is another communication method (Modbus/TCP communication), which incorporates Modbus protocol
messages on the Ethernet network.
Modbus is widely used in the fields of BA, FA, PA, etc. because its protocol specifications are open to the public and very simple.
(*1) For the protocol specification (PI-MBUS-300 Rev.J),
refer to https://modbus.org/.

10

3-2

LONWORKS Network Configuration

SCADA

SCADA

What is LONWORKS?

LNS(LONWORKS Network Services)

GatewayLONWORKS

DDC
I/O

I/O

BA3-CL20

BA40CL1

Dedicated controller
BA9-FCU

BA9-VAV

BA-RC2LONWORKS
allows node-to-nodecommunication freely
without a master.

BA-RCW1L

BA-RC2

Remote I/O

LONWORKS is a networking platform forintelligent distributed network systems anddeveloped by Echelon Corporation, an
American company. It is used in a wide
range of fields all over the world, including
BA, FA, home control, and electric and gas
monitoring.
LONWORKS is characterized by distributed
network systems. Network-connected
nodes, such as sensors and actuators,
have intelligence, and communicate withother nodes on the network and perform
independent control. Therefore, each node
incorporates an intelligent element called aneuron chip, where a control program iswritten.
The communication protocol of LONWORKS
is called LONTALK and it is defined for thephysical layer through to the application
layer. Various dedicated transceivers (LON
chips) are prepared for physical layercompatibility.

I/O

R7L

I/O

R3-NL13-3

BACnet Network Configuration

BACnet is useful forbuilding multi-vendor
systems.

What is BACnet?

SCADA

SCADA

BACnet/IP

Gateway

BACnet router

BACnet MS/TP

DDC
I/O

I/O

BA3-CB10

BA3-CB10

Remote I/O
I/O

BA3-NBI1I/O

BA3-NBM111

I/O

BA8BM-DAC8

BACnet is an ANSI/ISO standard promotedby the American Society of Heating,
Refrigerating, and Air conditioning
Engineers (ASHRAE), and is widely used as
an open communication protocol for BA (*2).
Two communications methods are available,i.e., BACnet LAN (a communication method
using Ethernet, MS/TP, etc.) and BACnet/IP
using Internet Protocol (IP), either of which
is used according to the network layer to be
used.
BACnet is characterized by physical devices(I/O devices) on the network and data thateach device has, which are defined as
objects (a set of abstracted data) andspecifies services (standard procedures)that classify the purposes of accessing theobjects. For this reason, manufacturers’
own interfaces are unnecessary, and theinteroperation of devices of different
manufacturers becomes easy.
(*2) For the latest information on BACnet,
refer to https://bacnet.org/.

Chapter 4

4-1

BA Components
Open Network DDC with Full of Useful Unique Functions Unavailable
to General-purpose PLCs

The DDC is an autonomously distributed controller installed on site and communicates with the host SCADA and other control
devices. Even if the network is shut down, the distributed controller will continue on-site control without being influenced.

LONWORKS DDC

BA Controller
Modbus-RTU DDC

Model: BA3-CL20

BA Controller

BACnet DDC

BA Controller

Model: BA3-CM20

Model: BA3-CB10

Main Functions and Features of Open Network DDC• Mounted onto the base of the remote I/O R3 Series to functions as a DDC exclusively for air conditioning.
• The Remote I/O R3 Series handles many I/O points, with which a wide variety of I/O modules can be used.
Analog input: Up to 256 points

Analog output: Up to 256 points

Discrete input: Up to 1024 points

Discrete output: Up to 1024 points• A programming language adopted conforms to international standard IEC 61131-3.
Recommended: Function Block Diagram (FBD)• Dedicated function blocks are available for air conditioning control.

Open Network DDC

Hardware configuration example using DDC

Power
supplymoduleOpen
network
DDC

Di module

Do module

Ai module

Ao module

Modbus-RTU, Modbus/TCP, LONWORKS, BACnet

Ao

Ai

Do

Di

• Chilled water valve• Hot water valve• Damper(outside air/
exhaust/return air)• Outside air temperature• Outside air humidity• Supply air temperature• Return air temperature• Return air humidity• CO2 concentration• Supply air fan• Return air fan• Outside air/Exhaust fan• Solenoid valve(for humidifier)• Differential
pressure switch(filter alarm)• Supply air fan(status and alarm)• Return air fan(status and alarm)

A DDC model of I/O integrated type is also available.
LONWORKS DDC■ Analog input• DC Voltage : 2 points• RTD (2-wire) : 2 points■ Discrete input : 4 points■ Analog output : 6 points■ Discrete output : 4 points

BA Controller
Model: BA40CL1

12

Feature 1

The Function Block system can be adopted as a programming language.

Can I create a Function Block?

Anyone can easily make one.
We can prepare complicated Function Blocks,
such as those for enthalpy operations
and also PID operations.

What are Function Blocks?
Contributing to efficiency improvements in the development of programs and the reduction of mistakes!
Function Blocks are repeatable programs that consist of blocks of frequently used logic and operations.
They contribute to efficiency improvements in the development of programs and the reduction of programming errors.

Enthalpy Operation
Function BlockDry bulb temperature [°C]rDB

Relative humidity [%RH]rRH

Dewpoint temperatureThis is an example of[°C]
an enthalpy operation block.
This block performs enthalpy operations by entering
the dry bulb temperature and relative humidity or thedry bulb temperature and dew point temperature.
There is no need to enter complicatedoperation formulas.

rDPT

PID Operation
Function Block
Tracking input

rTR

Process input

rPV

Setpoint input

rSP

Proportional bandrPB

Integration time

iTI

Derivative time

iTD

Reset value

rUR

Direct/reverse operation

xDIR

Deviation gap

rGAP

Number of operation skips

iSKP

rVout

rVout

Enthalpy [kJ/kg]

This is a PID operation block.
By entering necessary parameters, such as set values
and proportional band parameters, the block will output
the operation result from the rVout terminal.
There is no need to write complicated control
programs.

Control output

13

Advantages of Function Blocks
Function Blocks greatly reduce the number of steps necessary to write programs.
A ladder program requires aperson to write many steps
and takes time.

In the Function Block method,each block is used repeatedly, reducing
concerns about bugs.
Programming work can also be shared.

The program is easy to read for everyone.

I had to change an existing PLC ladder programfor renovation work, but there was a problem.
I could not figure out the program that someone
else wrote.
A program written using the Function
Block method consists of a
combination of blocks that anyone
can read.

Completed Function Blocks can be used repeatedly.
A ladder program is like a scroll,making it difficult to reuse theprogram that I took time to write.

I always make ladderprograms from the
beginning and they taketime and cost money.

Time-proven Function Blocks do not need debugging.
If engineers share blocks,
they can reuse them for other projects.

14Software assets are accumulated.
Ladder programs do not have block unit
specifications.
It is hard to make devised programs asoftware asset.

Time-proven Function Blocks
are important software assets
for any company.

How do they differ from ladder programs?
A program can be completed by simply connecting Function Blocks with lines.
A function block diagram is created by connecting each terminal of Functions and Function Blocks with wires.
A program flows from left to right and from top to bottom. It has a structure that anyone can understand at a glance.

Program flow

Program flow

15

Feature 2

Convenient function blocks are ready for use.

Example of a Function Block library for operation use
Function
1

Segment linearizer

2

Calorie calculation

3

System basic processing (system function)

4

Cyclic timer

5

Dual delay timer

6

Enthalpy operation

7

First order lag filter

8Comparison with hysteresis

9

Supply air temperature optimization control

Many Function Blocks
dedicated to air conditioning
control are prepared. We
have succeeded in drasticallyreducing the number ofprogramming steps.

10 PID operation
11

Momentary output

12 Rate-of-change limit
13 Writing history records on variables

Open network DDC

14 Pulse counter
15 Acquisition of current date and time
16 Weighted average

Feature 3

The Open Network DDC can use a wealth of I/O points ofRemote I/O R3 Series.
Not many analog I/O
types are available
to the PLC.
A preprocessing converter
is always required, which
results in a cost increase.

Multi-channel, Scalable
Remote I/O

R3 Series

The open network DDC can use a wealth of
I/O points of the Remote I/O R3 Series.
Furthermore, modules for BA,
including the Calorie meter and the Valve positioner
module, are also available.

An amazingly
wide variety
of models
are available.

DC mV, V, mA Input

24 modelsSensor Input

19 modelsPower I/O

16 modelsAnalog Output

7 models

Pulse I/O

13 modelsAlarm

7 models

Discrete I/O

22 modelsBA Control

9 models

For details of the Remote I/O R3 Series,

BCD Code I/O

2 modelssee 4-4 in Chapter 4 on page 20 .

Temperature Control

1 model16Feature 4

Sample programs (*3) for standard AHU control are available.

Sample Programs
The second sample
program can be used
as a template for our
upcoming work.

Seven sample programs for standard AHU control are available.
Using similar instrumentation patterns as templates will reduce engineering
efforts at the time of initial installation and facility remodeling.

No.
1

2

3
4
5
6
7

Equipment configuration

Control contents

Chilled water and hot water (2-coil) system +Indoor temperature control, indoor humidity control,

Total heat exchanger

outside air cooling control, CO2 control, etc.
Supply air temperature control, return air humidity control,

Chilled water and hot water (2-coil) system +Total heat exchanger + VAV

air volume variable control, outside air cooling control,
CO2 control, etc.

Chilled water and hot water (2-coil) system

Indoor temperature control, indoor humidity control, etc.

Chilled water and hot water (2-coil) system +Indoor temperature control, indoor humidity control,

Outside air damper

outside air damper control, etc.

Chilled water and hot water (1-coil) system +Indoor temperature control, indoor humidity control,

Total heat exchanger

outside air cooling control, CO2 control, etc.
Indoor temperature control, indoor humidity control,

Chilled water and hot water (1-coil) systemoutside air cooling control, CO2 control, etc.

Chilled water and hot water (2-coil) system +Indoor temperature control, indoor humidity control,

Outside air damper

outside air damper control, etc.

(*3) When using a sample program, be sure to check the specifications, and perform check work, including debugging. Contact us for sample programs.

Feature 5

Debugging program simulators are available.

Debugging program simulators
The debugging of a developed program on the desk will reduce on-site work and person-hours.
A simulator is available with four RTD output points, a digital/analog I/O simulator with 24 discrete I/O points and 8 analog I/O points,
and a power start/stop simulator.
Our special staff will support you. Please contact Customer Center for details.

Debugging work using a simulator

Power start/stop simulator

17

Digital/Analog I/O simulator

4-2

VAV-dedicated Open Network Controller (Model: BA9x-VAV)

The BA9x-VAV is a VAV-dedicated controller that varies the damper opening and changes the airflow volume, thus controlling theindoor temperature. The BA9x-VAV communicates with the AHU-dedicated open network DDC over the communications networkand performs indoor temperature control in linking with the AHU. The BA9x-VAV is a compact size controller attached to the VAVin the ceiling.
ModbusFunction Diagram
VAV Controller
VAV(Run/Stop, temp and other settings)

Model: BA9M-VAVA
The BA9M-VAVA is premised to be
used in combination with a VAV unitthat can perform air volume control.
Use the BA9M-VAV in the case of a
VAV unit that needs Controlleremployed air volume control.

(RTD)

airflow speed(voltage)Comm
Circuittemp sensor
incorporated
Room Controller(Run/Stop,
temp setting/measuring)

Power input

LONWORKS

supply air temp

Output Driver

Modbus

Input Circuit

Modbus/RTU, LONWORKS,
BACnetMS/TP and other

Control Circuit

Model: BA9M-VAV

Comm
Circuitdamperfull-closed
damperfull-open

Di 1
Di 2

Open DoCOM

M

Close DoPower
SupplyDamper Motor

Model: BA9-VAV
Modbus, LONWORKSLCD Display
airflow speed sensor

VAV
Controller

damper opening control

UP Button

Mode Selector

DOWN Button
Status LED
VAV

RUN/STOP SW

supply supply

return air

Temp Sensor

LONWORKS
Room Controller

Room Controller

supplyreturn air

temp sensor
incorporated

Model: BA-RCW1L

Model: BA-RC2

supplyRoom Controller Room Controller
Model: BA-RC2 Model: BA-RCW1L

For max. 4 zones

1 Temperature Control

2 Airflow Volume Control

The VAV Controller calculates airflow volume demand to adjust room
temperature toward a setpoint.
The demand is then used for airflow volume control as explained below.

The VAV Controller calculates current airflow volume using a speed sensor signal andmanipulates damper opening to minimize airflow volume difference from the demand.
The damper opening is manipulated in five positions.

DEMAND=(Proportional Control Output(Preset Max Volume – Preset+ Integral Control Output) × Min Volume) + Preset Min
Volume100%

damper opening (%)

20

Manipulated value for proportional control is determined by room temperature asshown in the figure below.
MV

MV

COOLING

100%

100%

Y1

Y2

deviation detecting
deviation
detecting(*7)
sensitivity(*4)
sensitivity

25● Proportional Control

deadband15(Y1)HEATING10

dampercontrolsensitivity

5

(*5)

X1
0%

0%

proportional band

set temp

T1

room
temp (°C)

Y1 : MV at room temp T1–40

proportional bandT2

set temp

room
temp
(°C)

Y2 : MV at room temp T2● Integral Control
Difference between setpoint and room temperature is calculated every second andaccumulated. Manipulated value for integral control is determined by dividing theaccumulated value by its integration time as shown in the figure below.
MV

MV

COOLING

100%

100%

Y1

Y2

0%

0%

proportional band

0

X1

integrated
value
time

Y1 : MV at computation result X1

–10

0

10

20

30

40

● Damper Opening and Operating Time
The damper opening is controlled in proportion to a contact closure time
provided by the VAV Controller for each of Open and Close directions.
When the power supply is turned on, the Controller runs the damper fromthe full-open position to the full-closed position to measure its full span timeand calculate opening change by time unit. The damper can be then set to adesired opening position in reference to the full-closed position by thecontact closure.

proportional band

0

[Current Flow − Demand] (l/s)–20

Control action at 5% damper control sensitivity and 10 l/s deviation
detecting sensitivity:
Y1 : Damper control output at [Current Flow − Demand] X1(*4) Deviation detecting sensitivity (l/s) is selectable.
(*5) Damper control sensitivity (%) is selectable.

HEATING

X2–30

integrated
value
time

Y2 : MV at computation result X2

18

4-3

FCU-dedicated Open Network Controller (Model: BA9x-FCU)

The BA9x-FCU is an FCU-dedicated controller that adjusts the room temperature with the starting and stopping of the FCU fan, thehigh-, medium-, and low-speed control of the fan, and the opening control of the chilled and hot water valves. The BA9x-FCU
communicates with the host SCADA unit over the communications network. The BA9x-FCU is a compact controller mounted on
the FCU.
chilled hot
Function Diagram

LONWORKS

M
chilled
water
valve

Room Controller(Run/Stop, temp
setting, airflow
volume setting,set/measure temp)
Power input

Comm
Circuit

Open DoCOM

Output Driver

built-intemp
sensor C

Control Circuit

Input Circuit

Temp Sensor B(RTD) for heating

Model: BA9M-FCU

COM
Close Do

Temp Sensor A(RTD) for cooling

Modbusreturn supply return supply
Open DoComm
Circuit(Run/Stop, temp and other settings)

water

water

FCU Controller

Modbus/RTU, LONWORKS,
BACnetMS/TP and otherM

Close Dohot water valve

External
Power Source

FCU

c

FUSE

H

COM

Power
Supply

L

Do

M

Do

H

Do

FAN

c
c
Heat Exchanger

Model: BA9-FCU(coils)Modbus, LONWORKS
temp sensor A
LCD Display

supply chilled
return water

temp sensor B

Mode Selector
Fan Control
ButtonsupplyreturnUP Button

Do×2 points

DOWN Button

Do×2 points

hot
water

M
M

Do×3 points

Status LED

FCU

RUN/STOP SW

FCU Controller
Temp Sensor

Room Controller

LONWORKS
Room Controller

Model: BA-RC2

Model: BA-RCW1L

built-in temp
sensor C

c

H

c

c

FAN

Heat Exchanger(coils)Room Controller
Model: BA-RCW1L

For max. 4 zones

Ceiling

Room Controller
Model: BA-RC2
return air

supply air

1 Airflow Volume Control

2 Valve Opening Control

High, Medium, Low volume settings and Auto mode are available.
High, Medium or Low is manually switched.
In the Auto mode, the FCU adjusts airflow volume automatically in response to thedeviation of measured room temperature(*6) from setpoint. ‘Fan OFF’ mode, in which
the airflow is turned off when the deviation is within a preset deadband, is also
selectable during automatic control.

The FCU Controller manipulates chilled/hot water valves according to the deviation of
measured room temperature from setpoint.
Either proportional or ON-OFF control strategy is selectable.

● Cooling Mode (proportional control)
The chilled water valve opening is controlled in five steps as in the figure below. (*7)
chilled water valve opening(%) deadband● Cooling Mode

step
temp

100
80

volumedeadbandtemp step

Y1 60

H

40

Y1 M

20
3.5
0
1.0
1.5
2.0 T1 2.5
3.0 deviation (°C)
set temp
Chilled water valve opening with 1.0°C deadband and 0.5°C step temperature
Y1 : Chilled water valve opening at deviation T1

L
Zero
2°C

set temp

4°C

T1

6°C

Deviation (°C)

● Heating Mode (proportional control)‘Fan OFF’ mode

The hot water valve opening is controlled in five steps as in the figure below. (*7)

Airflow volume setting with 2°C deadband and 2°C step temperature
Y1 : Airflow volume at deviation T1

hot water valve opening(%)
step temp
100● Heating Mode

deadband80

volumetemp step

Y1 60

deadband

40

H

20

Y1 M

0
3.5
deviation (°C)

L
Zero
6°C

4°C

T1

2°C

3.0

2.5 T1 2.0

1.5

1.0

set temp

Hot water valve opening with 1.0°C deadband and 0.5°C step temperature
Y1 : Hot water valve opening at deviation T1

Deviation (°C)
set temp‘Fan OFF’ mode(*7) Valve Opening and Operating TimeThe valve opening is controlled in proportion to a contact closure time provided
by the FCU Controller for each of Open and Close directions.
When the power supply is turned on, the Controller runs the valve from thefull-open position to the full-closed position to measure its full span time andcalculate opening change by time unit. The valve can be then set to a desired
opening position in reference to the full-closed position by the contact closure.

Airflow volume setting with 2°C deadband and 2°C step temperature
Y1 : Airflow volume at deviation T1(*6) Measured by temperature sensor of the remote controller

19

4-4

I/O Modules Dedicated to BA
are Available for Remote I/O R3 Series

The Remote I/O R3 Series handles many I/O points and is convenient andsuitable for air-conditioning control.
Multi-channel, Scalable Remote I/O

R3 Series

Varies with the model

The R3 Series is the most substantial remote I/O that responds to various types of networks and I/O modules.

Configuration

Each module handles many input or output points, thus making it possible to configure ahigh-density I/O system at a low cost.
The user can combine only the necessary modules, thus making it possible to build a systemeconomically without waste.
Network module Installation base

Scalable
Remote I/O

This is a modular type remote I/O system
built with a flexible selection of power supply
modules, network modules and input andoutput modules mounted on the base.

Size: H 130 (5.12) × D 120 (4.72) mm (inch)■ Supports many types of network
protocols.
■ I/O modules in a wide variety areavailable.

Power supply
moduleI/O module

Easy and reliable snap-in mountingBase

2 slots - 16 slots

Base, free I/O address

4 slots - 16 slots

Power Continuous output current: 750 mA, single slot
supplymodule Continuous output current: 2 A, double slot

Removable terminal blocks

Each I/O module and network module has a CPU and data is updated in serial
communication with each other.
Therefore, if dual redundant communication system is used, no momentaryinterruption or bumping of analog output will occur even at the time of switching
the system.
Exchanging I/O modules or
Hot-swappable
network modules does notmodules
affect other modules.
The user can replace themwith the power kept turnedon.

Each R3 Series terminal block is of detachable
construction.
This is convenient when checking or changing
the specifications of your system.

Input terminal block

Power supply
terminal block

Supports many types of network protocols

Three types of terminal blocks

Responds to 12 types of networks. (see below)

Connector-type terminal blocks (18 types) and tension
clamp terminal blocks (12 types), as well as screw
terminal blocks, are available.

Economical I/O modules
Each remote I/O module has many input or output
points, thus ensuring high cost performance per point.

Supports dual redundant network and two independent networks

A wide variety of special function modules.

Supports dual redundant power supply and two independent power sources

A wide variety of special function modules are available,
which include a multi-power monitor module for power
calculations and a temperature controller module.

Possible to build a redundancy system with dual power
supply or two power sources at 100 V AC, 200 V AC,
and 24 V DC.

Improves the reliability of data communication.

Types of communications networks
BACnet20

Convenient I/O modules for BA are available, including a one-shot
pulse module used to turn power on and off and a remote control relay
module.
Model

I/O

Application

R3-DA16Discrete input, 16 ch.

Status monitoring, failure monitoring, and alarm
monitoring

R3-DC16Discrete output, 16 ch.

Season switching, status display, and interlocking

R3-DAC16

Discrete I/O(Di 8 ch., Do 8 ch.)Power on/off control (one-shot pulse output)

R3-RR8

Remote control relay
control, 8 ch.

Lighting control (remote control relay control)

R3-PA8

Totalized pulse input,
8 ch., 32 Bits

Pulse totalization (flow rate, power)(with preset function by host equipment)

R3-SV8
R3-SS8DC voltage/DC current
input, 8 ch.

Humidity, CO2, pressure, flow rate, and others

R3-YV8R3-YS4DC voltage output, 8 ch.
Controller, inverter, and others
DC current output, 4 ch.

R3-RS8RTD input, 4 ch.

Temperature measurements (Pt, Ni, Cu)

R3-US4

Universal input, 4 ch.

Temperature, pressure, opening and others

R3-MS8Potentiometer input, 8 ch. Damper opening, and others

R3-CT8A

AC current input, 8 ch.

Current measurement on power equipment

R3-WTU

AC power input(1 system, 2 systems)

Active power, reactive power, power factor,
demand, and others

R3-DS4A

4-20 mA input w/exc.
Power supply to 2-wire transmitters(switch provided),(4 systems).

R3-TS8

Thermocouple input, 8 ch. and others

R3-MEX2

Actuator drive output(2 systems)

R3S-CM2A

Temperature and flow rate Energy management(2 inputs)

Monitoring/ Measurement
controlPower

Totalized
pulse

Guidance 1
Page 22

Guidance 2
Page 22

Guidance 3
Page 23

Temperature measurement on pump bearings,

Direct driving of actuator(electric valve actuator and electric damper actuator)

It is quite troublesome to
input analog values, such as temperature andhumidity values, into a PLC through a ladderprogram because we need to take into consideration
the scaling and timing of the input.

Guidance 4
Page 23

Guidance 5
Page 23

The Remote I/O R3 Series I/O module
preprocesses the troublesome scaling and input timing,
thus greatly alleviating the burden of DDC programming.
It is advantageous that a wide variety of I/O modules areavailable including potentiometer input,
thermocouple input, etc.

21

Guidance 1 Discrete I/O module
Model: R3-DAC16 Discrete I/O (Di 8 points, Do 8 points)
Model: R3-DAC16A Discrete I/O (Di 8 points, Do 8 points,
internal power)

Run/Stop signals
from the central
monitoring
systemCX
relay

Output fromdiscrete I/O
module (run)• Tension clamp terminal blocks are available as well.
For details, see the specification sheet.

TX
relay

Output fromdiscrete I/O
module (stop)

Why is thediscrete I/O
moduleconvenient?

The discrete I/O module
sends one-shot pulses to the CX
relay and the TX relay on a power
distribution board to start up and stop
an air conditioner or pump.

Conventionally, logic
programming was required, but theR3 Series I/O Module processes therequired sequence internally,
which has alleviated the burden ofprogramming!

The discrete I/O module receives run/stop signals from thecentral monitoring system and outputs one-shot startup andstop pulses. This is convenient because it eliminates theneed for writing a run/stop program.

Guidance 2 Remote control relay control module
PLC

Model: R3-RR8

Do 8 points
100 or200 V AC• Tension clamp terminal blocks are available as well.
For details, see the specification sheet.
Remote I/O
R3-RR8

Remote control
transformer

Remote switch

Remotecontrol
relayLighting
equipment

The remote-control relay is a relay unit that is used toturn lighting equipment on and off remotely. You canturn the equipment on and off with low-voltage control
signals (e.g., 24 V AC control signals) without directly
turning the power supply to the equipment on and off.
The R3-RR8 can control remote control relays for eight
circuits.

Lighting control requires
troublesome electrical work
to connect control signals.

22

Guidance 3 Totalized pulse input module
Model: R3-PA8

Pi 8 points, 32 Bits

• Tension clamp terminal blocks are available as well.
For details, see the specification sheet.

What advantage is
expected from the functionthat allows the central
monitoring system to preset
the totalized count value?

The totalized count values of electricity, gas, and water supply are used for billingand indispensable to building management.
The law requires the replacement of billing meters at regular intervals, and it isnecessary to match the reading value of each meter with the corresponding
display value in the central monitoring system at the time of replacement. It isconvenient to use the function that allows the central monitoring system to preset
the integrated values.

Guidance 4 Valve positioner module
Model: R3-MEX2

for 2 systems, buit in SSR• For details, see the specification sheet.

Electric control valve

We still want to use theexisting valve actuator as
it is.

The Valve Positioner
Module can directly drive
existing motorized valves.

Guidance 5 Calorie meter
Model: R3S-CM2A

2 inputs, Tension clamp terminal block• For details, see the specification sheet.
ChillerThis product is available forcalorific value calculation for energy
management and for the control of
the number of heat sources.

23

BoilerMany more convenient and easy-to-use features are available.
I/O circuits are all isolated.

The PLC’s analog input is
non-isolated. Isolators are always
required on the input side.
The cost of a system will increase
for that reason.

The input circuits of all
Remote I/O R3 Series products
are insulated from the field side.
The cost will be reduced
accordingly.

Dual redundancy for power supply
and network is possible.

The R3 Series is an open network system that is
ideal for adding I/O points to existing systems.

The heat source
equipment of heat supply
plants must not stop
working. So, it needs to beabsolutely reliable.

Two power sources

We want to add I/O points
to an existing PLC system,
but we wonder if there is agood way to do this.

Two network lines

Existing PLC
CC-Link/DeviceNet

R3 Series

Commercial
power source
Emergency
power source

I/O

The R3 Series
can be used as remote I/O for an
existing PLC system.
The cost performance will also be
improved greatly.

The R3 Series
supports dual power supply andnetwork lines, which will increase thereliability of the system dramatically.

24

R3 Series

I/O

The lineup of Remote I/O Series includes
the R6, R7, R8, and R9 Series
besides the R3 Series.

Furthermore, a variety of models,
including those of subminiature type,
block type with fewer channels, slice type,multi-channel type, are available so that
customers can choose ones that are mostsuitable to their applications.

R6 Series

R6 Series - Ultra-Slim, Scalable Remote I/O

The R6 Series is an ultra-small combination remote I/O model thatcan make effective use of a small space as much as possible.
This is suitable for applications with relatively few I/O points where signal input and output coexist.
Three types of terminals—Euro, screw, and tension clamp terminals—are available so that
customers can choose the most suitable one.
What is more, a wide variety of network modules and I/O modules are available.

R7 Series

Compact Remote I/O

The R7 Series is a compact, all-in-one remote I/O model.
This economical palmtop remote I/O model of single block construction integrates a network,
power supply, and I/O in one package.
A wide variety of extension modules for contact I/O points are available.
In the case of analog inputs, the R7 Series transmits 0% to 100% data in a resolution of 0 to
10000 of the full-scale range.

R8 Series

Slice Type, Scalable Remote I/O

The R8 Series is a remote I/O model created in
response to customers’ requests.
This is a remote I/O model with no mounting base that can flexibly combine a necessary
number of ultra-thin I/O modules.
Modules with built-in interlocking functions are available. They turn all output signals OFF atonce in response to contact input from a safety device, such as an emergency stop switch.
We will welcome customers’ request to adopt different manufacturers’ terminal blocks andconnectors. Feel free to consult us.

R9 Series

Multi-channel All-in-one Remote I/O

This compact remote I/O model for power calculations
is designed with economic efficiency.
This is a power measurement remote I/O model that calculates various power quantities, suchas active power, reactive power, power factors, and apparent power, and communicates data
via open network.
The model accepts a maximum of eight channels of current input from the same system.
Therefore, the model is suitable for the power monitoring of multiple machines.
By mounting an SD card, the date-linked logging of power quantities, such as current andpower values, is possible.

25

4-5

Remote I/O Compatible with BACnet Building Automation Network

Convenient for building multi-vendor
systems
This Remote I/O model is compatible with BACnet as a defacto standard communication protocol for building
automation.

BTL certification
This product has BTL certification under acertification test service conducted by the BACnet
Testing Laboratory (BTL).

Direct I/O compatible with BACnet

Remote I/O compatible with BACnet

BA8 Series

BA3 Series

Discrete input & Relay output module,
4 points each (BACnet MS/TP)BA Controller(BACnet MS/TP, BACnet/IP)

Model: BA8BM-DAC8

Model: BA3-CB10
Network Module (BACnet MS/TP)

Model: BA3-NBM1
Network Module (BACnet/IP)

Model: BA3-NBI1
Users can select an optimum typeof I/O module from a wide variety of
Remote I/O R3 Series according
to the application.

Introduction of BACnet-compatible Products

PC

BACnet/IP
BACnetBA Controller
BA3-CB10

BACnet router

BACnet/IP
Network Module
BA3-NBI1

Heat-source Device

BACnet MS/TP
BACnetBA Controller
BA3-CB10

BACnet MS/TP
Network Module
BA3-NBM1

Direct I/O compatible
with BACnet
BA8 Series
Discrete/Pulse input, 4 points &Relay output, 4 points
Di (Pi) Do(BACnet MS/TP) Energy count pulses can also be input.
BA8BM-DAC8

Heat-source
DeviceDistribution
board
Chiller

Boiler26

4-6

Open-network-dedicated Controllers (Multi-function PID Controller and Temperature Controller)

Process Controller ofTouch Panel TypeMulti-Function PID Controller
IP55
Basic model
SC100
Modbus/NestBus extension model SC200

Full-spec New-generation
Programmable Controller

Multi-Function PID Controller with
IP55
Manual Loader• Provided with a fine, full-dot large color
LCD. (4.3-inch TFT with 256 colors,
480 × 272 dots)• Equipped with advanced control andcomputing functions to support a wide
range of user applications.
• Excellent maintainability supported byvarious engineering functions.

Basic model
SC110
Modbus/NestBus extension model SC210

Multi-Function PID Controller with
IP55
Pulse Width Output
SC200DNEW

Example: Reciprocating pressure
control of chilled water control

Flowmeter

The SC series controller can control two loops. In thisexample, a controller performs the pressure control of thechilled water supply and return headers. By writing asequence program in the controller, complicated sequencecontrol will be possible for starting and stopping pumps.

Control of
the numberof pumps

Communicating withcentral monitoring devices
Pressuretransmitter
ModbusAi

Ai

Pressuretransmitter

SC210

Ao
Ao

Chilled water secondary header

Pressure holding valve

Do

Butterfly valve
Bypass valve

We have a lot of experience inheat source receiving facilities
from district heating andcooling plants.

Chilled water return header

Chilled water primary header

DHC

Temperature Controller andTemperature Control Module

Temperature Controller
IP65

A general-purpose type temperature
controller incorporating aneasy-to-see display• By allocating contact input, the user canswitch banks and operation modes.
• The TC10EM can control two loops. The
remote setpoint (SP) function is available inthe case of single-loop control.
• Manipulated value (MV), process value(PV), and alarm output can be allocated ascontrol outputs.

TC10EM

96 (3.8) × 96 (3.8) mm (inch)
TC10EM48 (1.89) × 96 (3.8) mm (inch)
TC10NM

TC10NM

Temperature Control
Module(R8-TC2)
R3-TC2

R8-TC2

R3-TC2
R8-TC2

Example: Room temperature andhumidity control
A single TC10EM temperature controller can work in two-loop
control of temperature control and humidity.
Furthermore, it can communicate with the central monitoring
system over Modbus.
A temperature
controller is enough forsimple temperatureand humidity control.

Modbus

TC10EM

Return air
damperChilled watervalve

Hot water valve

C

H

C

Chilled
water
coil
C

Outside air
Outside air damper

Communicating withcentral monitoring
devices

Hot
water
coil
Air supply fan

AHU• For details, see the specification sheet.

27

Humidifier valve

IndoorIndoorhumidity temperature
sensorsensor
Supply air

4-7Compact Linear Motion Electric Actuators MSP SeriesHigh Resolution of 1/1000
Long Life Operation
Open Network Capable Actuator

IP66

LINEAR MOTIONLINEAR
MOTION

Varies with the model2500 N 40 mm
562 lbf 1.57 in

MAX THRUSTMAX STROKEACDC
POWERED

Adopts a stepping motor.

A compact and lightweight electric actuator for control valves.

With the adoption of a stepping motor, the MSP Series
has achieved a long life and a resolution of 1/1000 of thefull stroke. Furthermore, the MSP Series supports
various types of open network protocols.

The high-thrust, compact, and lightweight MSP Series can be connected to acontrol valve located in a narrow space or at an elevated position. The MSP
Series is driven by linear motion in which the output stem moves directly up
and down. Therefore, unlike conventional electric actuators, the MSP Series
does not need a link mechanism to convert the rotating movement to linear
motion. The MSP Series incorporates zero and span adjustments, whichenables stroke and tightening position adjustments with a control valve at thetime of setup, thus greatly reducing on-site adjustment time.
The MSP Series lineup includes
models that support open networks
and auto-setup function.

Control Circuit• Electronic limiter for
full-open/-closed
positions for easy
calibration• Overload protection
functions

Stepping Motor

Power cable

Seal-spring• Spring mechanism for both extending andretracting directions• Constant sealing pressure(MSP4 for single direction only)

Output Stem

External view

IP66

IP66

IP66

Model No.

MSP4

MSP5

MSP6

Operation Time
(10 mm),Thrust5 sec. / 150N
9 sec. / 300N
18 sec. / 700N

5 sec. / 150N
9 sec. / 300N
18 sec. / 700N

5 sec. / 600N
8 sec. / 1200N
15 sec. / 2500N

Stroke5-10 mm, 8-15 mm

5-10 mm, 10-20 mm

10-20 mm, 20-40 mm• For details, see the specification sheet.

28

4-8

Signal Conditioners and Other Products
Generally Used for Air-conditioning Control

1 Splits a single input signal into four isolated output signals.
The MFS2 is very often used for air-conditioning control systems.
72(2.83)

Isolated Four Outputs

Split-Range Transmitter80(3.15)
Load
[%]
100

Control of thenumber of pumps

139(5.47) Flowmeter
Unit: mm (inch)

ModbusExample: Inverters and a bypass valve in controlof the supply pressure of a chilled water header.
The control output from a pressure controller is split into
inverter control signals for three chilled water pumps anda single control signal for a header bypass valve.
Three chilled water pumps and a header bypass valve
are split and set in the sequence as shown below.
The MFS2 makes it easy to realize an energy-saving
system that supplies chilled water to match the load of
the chilled water.

TC10EM
Pressuretransmitter

Pressurecontroller

Communication

MFS2

P-2

Inverter output(same output forthree inverters)0

Secondary supply header
P-1

Bypass valve output

Split Range Transmitter

Model: MFS20

Bypassvalve

P-3

Primary supply header

Pressure set value[Pa]

Primary supply header

The MFS2 works as amulti-function unit with four
isolated output points
that allow flexible ratio
and bias settings.

Example: Instrumentation in control of an air conditioner cooling with outside air
Temperature set value

Valve and damper
openings

The MFS2 splits the control output of the temperature
controller and transmits four isolated output signals
Modbus
TC10EM
Commuindividually to the hot water valve, chilled water valve,
nication
Judgment signal on
Temperature controller[%]
cooling with outside air
outside air and exhaust dampers, and return100
air damper. Furthermore, the MFS2 inputs into
MFS2
Hot water
valve
the temperature controller a contact signal to
ChilledExhaust damper
water valve
Exhaust fan
activate the function of cooling with outside air.
ExhaustReturn air damper
ExhaustThe chilled water valve and hot water valve
operate in the sequence for cooling andOutside air andIndoor temp. sensor
Return air Chilled water Hot water
exhaust air damper
Humidifier
heating as shown below. When cooling with
Damperdamper
valve
valve
valve
Supply air
minimum
outside air is possible, the outdoor air damper,
HC
opening
temp. sensor
exhaust damper, and return air damper will0
Supply air
Outside air
Chilled
Hot
0
[°C]
water
water
Outside air damper
operate in the sequence shown and perform
Air supply fan
Temperature set value
C
C
coil
coil
outside air cooling.
AHU• For details, see the specification sheet.

2 Splits a single input signal into two isolated output signals (non-isolated).
Chilled water valve and hot water valve control is possible with a single control output signal.
50(1.97)

Control example of chilled water
valve and hot water valve of AHU

80 (3.15)

Model: MFS

Modbus

TC10EM136 (5.35)

The MFS receives the output signal of
the temperature controller and splits
the signal into two and outputs them.
The MFS is used for the V-shaped
split operation of the chilled water
valves and hot water valves of AHUs
and the split operation of large-sized
and small-sized flow valves.
• For details, see the specification sheet.

100

MFS

Unit: mm (inch)
Return air
damperChilled water
valve

Outside air
damperC

Humidifier
valve

Hot
water
coil

Air supply fan

Indoor Indoor
humidity temp.
sensor sensor

H

C

Outside air

Hot water
valve

Chilled
water
coil

C

AHU

29

Hot water
valve

[%]

Communicateswith the central
monitoring device

Supply air

Valve opening position

Split-Range Transmitter

Chilledwater valve

00Temperature set value[°C]3 Existing electric instrumentation using 135 Ω input can be retrofitted.
4-20 mA DC is converted into a resistance value such as 135 Ω.
50(1.97)

Wide Variety of Resistance Ranges

DC/Potentiometer Converter

Existing System

80 (3.15)

Model: CVR1

135Ω

136 (5.35)

Manual setting(thermostat)

Unit: mm (inch)• Upgrading of manual-to-remote setting for inverters• Remote control of electric actuators accepting 135 Ω
input• Automation and remote setting of equipment
controlled manually with potentiometers

Old electric
equipment using
135 Ω can be saved.

Electric
motor

We want to control remotely while
maintaining the existing electric actuator.

Updated System

Centralmonitoring
systemWide Selection of Resistance Ranges
5 kΩ

50 kΩ

1 kΩ

10 kΩ

100 kΩ

2 kΩ

20 kΩ

100 Ω

500 Ω

135 Ω
200 Ω

DC/
Potentiometer
Conveter
CVR1

4-20 mA DC

135Ω

Electric
motor• For details, see the specification sheet.

4 I/I Positioners dedicated to electric valves and dampers for air conditioners, driven with 24 V AC
Position control is possible with a direct/reverse turn motor.
Existing motor-operated
valves can be used asthey are.

Valve Positioner (for 24 V AC motor)
50(1.97)

Model: KMP

80 (3.15)

132 (5.20)
Unit: mm (inch)

4-20mA DC

KMP

The KMP receives a control signal of 4 to
20 mA DC from a controller and drives an electric
valve or damper that provides a feedback signalof 135 Ω. The long life of the KMP is ensured
with semiconductor switches for control signal
output. Users can select also the options for the
split operation or reverse operation whenordering.

Network-capable Valve Positioners

4-20mA DC

Modbus, built-in SSR

KMPModel: MEXM

Return air
24V AC

Chilled water
valve
C

50
(1.97)

24V ACHot water
valve

Humidifier
valve

H

Supply air
temperature
sensor
Supply air

Outside air
Outside air damper
C

Chilledwater coil C

Hot water
Supply air fan
coil

80(3.15)

Model: MEXL
136 (5.35)
Unit: mm (inch)

AHU• For details, see the specification sheet.

LONWORKS,
built-in SSR

30

5 Isolators accepting a single input signal, and providing two isolated output signals.
Two isolated output signals are convenient for the inverter control of air supply and exhaust fans.
The following diagram is an application
example where a single isolator is used to isolate inverter
signals for the air supply fan and the exhaust fan.
The W2VS/W5VS is also useful for splitting one signal intoa measurement signal and a control signal.

29.5 (1.16)

Plug-in Socket Mounted

Signal Transmitter
88.5 (3.49)

Model: W2VS

outsidetemp /
humitidy

DDC for HVAC SYSTEM

124 (4.88)
Unit: mm (inch)

Built-in excitation,
Two isolated outputs

1-5 V DC50
(1.97)

C

outside air

FAN

outside air
damperPulse IsolatorC

80 (3.15)

C

AHU

return air
damperModel: KWYPD

H

supply air
supply air
temp

inverter
4-20 mA DC
SignalTransmitter
W2VS

132 (5.20)
exhaust fan

Unit: mm (inch)

exhaustexhaust damper

return air
CO2 return
air temp

FAN
inverter

4-20 mA DC• For details, see the specification sheet.

6 Function modules generally used for BA
Easy ratio/bias setting with the control buttons with a help ofdigital display behind the front cover.

Output Bias

Ratio/Bias
Transmitter

23 (0.91)

76 (2.99)

Model: M2REB
124 (4.88)

The Ratio/Bias
Transmitter is an
output bias type(ratio function
X0=KX1+B) and you
can set both ratio and bias settingwith the control buttons with a help ofdigital display behind the front cover.

7 Noise filter for
LONWORKS
Compatible to FTT-10A network.
38 (1.5)

LONWORKS

Noise Filter

110 (4.33)(FTT-10A)

Model: NF-LWA

35 (1.38)

Unit: mm (inch)

Unit: mm (inch)

Addition or selection for two signals are performed.

High/Low
SelectorModel: M2SES

23 (0.91)

The M2SES outputs the larger orsmaller one of two input values.
This feature can be used for
76 (2.99)
dehumidification control (forexample, with a chilled water valve)by selecting either of a temperature
124 (4.88)
control signal or a humidity control
Unit: mm (inch) signal.

RTD transmitter programmable with a PC software tool

PC Programmable

RTD Transmitter

23 (0.91)

Various types of RTD sensors, e.g.
JPt, Pt, Ni, Cu, are selectable.

76 (2.99)

8 Indoor switch
for LONWORKSLONWORKS

Indoor Switch

43 (1.69)

92 (3.62)

Model: BA-RCL
40 (1.57)
Unit: mm (inch)

Model: M2XR2The BA-RCL is an indoor switch for the LONWORKS,
which is used to perform the ON/OFF control of lighting.

124 (4.88)
Unit: mm (inch)• For details, see the specification sheet.

The NF-LWA satisfies the specifications of insulation
choke for FTT-10A network recommended by Echelon.
Note: This unit is not applicable to LONWORKS Link
Power network.

31

Easy-to-understand Mechanism of Central HVAC Control
Your local representative:

WebsiteRequest Info

MG CO., LTD.
(formerly M-System Co., Ltd.)
www.mgco.jp

Specifications are subject to change without notice. When ordering, use the latest data sheets available at our web site: www.mgco.jp

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