USB DIO High Voltage and Relay
USB-PDISO8, USB-ERB, and USB-SSR Series
Features• USB-PDISO8 Series− 8 Form C relays− 8 isolated AC or DC inputs• USB-ERB Series
USB-PDISO8 Series

USB-ERB Series− 8 or 24 Form C singlepole double-throw (SPDT)
electromechanical relays.

USB-SSR Series

Overview• USB-SSR Series− 8 or 24 input or output
channels to control andmonitor solid state relays.

Measurement Computing DIO high voltage and relay USB product offerings include
the USB-PDISO8 Series, USB-ERB Series, and USB-SSR Series.
The USB-PDISO8 Series offers eight isolated AC or DC inputs and eight electromechanical relays in a single digital I/O system. The USB-ERB Series enables a PCor laptop to control eight to 24 electromechanical relays.

• Screw terminal or header
connectors

The USB-SSR Series can monitor and control eight to 24 standard size solid state
relay (SSR) I/O modules (relays sold separately).

• Heavy-duty chassis withintegrated mounting slots

All devices in these series come in a heavy-duty metal enclosure with integrated
mounting slots, which ensures that the devices are rugged enough for any DAQ
application.

• Includes external power supply(required for all devices)

Relay Contacts andConnectors

SSR Digital I/O Control
Modules

USB-PDISO8/USB-ERB Series Only

USB-SSR Series Only

The USB-PDISO8 and USB-ERB Series
devices provide screw terminal connections to the relay contacts. The
USB-PDISO8/40 provides relay connections through a 40 pin connector.
Each relay has a normally closed (N C),
common (C), and normally open (N O)
contact. Relays on all devices are controlled by digital I/O lines.

Supported Operating Systems• Windows 11/10/8/7/Vista®/XP
32/64‑bit• Linux®

The USB-SSR08 provides mounting locations for eight SSR digital I/O modules,
and the USB-SSR24 provides mounting
locations for 24 SSR modules.

The SSR modules use a standard color
scheme to help quickly identify the module type installed.

SSR digital I/O modules are relay control modules that provide 4000 Vrms of
optical isolation. Digital input modules
sense AC/DC voltages from field devices
and convert them to digital TTL signals.
Digital output modules use TTL signals toswitch and control AC/DC loads.
A wide selection of SSR digital I/O
modules are available to switch or sense alarge range of AC or DC voltages.

Compatible SSR modules are available separately (refer to SSR Digital I/O Modules on
page 10).

USB-PDISO8 Series, USB-ERB Series, and USB-SSR Series Selection Chart
Model

Relay Channels

Contact Rating

Daisy Chain Support*

Signal I/O Connector

USB-PDISO8

8 Form C (SPDT)

6 amps at 240 VAC/28 VDC✔

40-pin screw terminal

USB-PDISO8/40

8 Form C (SPDT)

6 amps at 240 VAC/28 VDC✔

40-pin header connector

USB-ERB08

8 Form C (SPDT)

6 amps at 240 VAC/28 VDC✔

24-pin screw terminal

USB-ERB24

24 Form C (SPDT)

6 amps at 240 VAC/28 VDC✔

72-pin screw terminal

USB-SSR08

8 Solid State Relay Modules–✔

16-pin screw terminal

USB-SSR24

24 Solid State Relay Modules–✔

48-pin screw terminal* Use standard/included USB cable for communications daisy chain; user-supplied custom cable required for power daisy chain

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USB DIO High Voltage and Relay
Features
Daisy Chaining Multiple Devices

I/O Module Type Switch
USB-SSR Series devices have an onboard switch to configure
each module group for either input or output.

MCC high-voltage/relay DIO devices can be optionally daisy
chained to connect to the USB bus through the high-speed hubon the host device. Up to four MCC USB devices can be daisy
chained to a single USB port on the PC using the standard/
included USB cables.

Devices are shipped with all modules configured for output.
Input and output modules cannot be mixed within a group.
Positive and negative relay contacts are brought out to screw
terminals for field wiring connections.

Make sure adequate power is provided to each connected device.
You can use an independent power supply for each device, orconnect a user-supplied custom cable to daisy chain power.

Relay Configuration Switche
USB‑ERB/USB-SSR Series Only

Voltage Drop

Devices are shipped with all relay banks/module groups confi ured for non-inverted logic and pull-up (relays/modules inactive
on power-up).

Supply Current

A drop in voltage occurs with each device connected in a daisy
chain configuration. The voltage drop between the power supply
input and the daisy chain output is 0.5 V maximum. Factor inthis voltage drop when configuring a daisy chain system to ensurethat at least 6.0 VDC is provided to the last device in the chain.

USB-SSR Series and USB-ERB Series devices have two onboard
switches for configuring the relay logic polarity and output relay
power-up state for each relay bank/SSR module group. The current configuration of each switch can be read back with software.

The following devices may require addition external power
adapters depending on the number of connected devices:

Differential Isolated Digital Inputs
USB-PDISO8 Series Only

All eight inputs on USB-PDISO8 Series devices can be driven byeither AC (50 Hz to 1000 Hz) or DC voltage, and can be readback as a single byte.
Each input has a software-selectable filter with a time constantof 5 ms (200 Hz). The filter is required for AC inputs, and recommended for most DC inputs.
Each module group can be set to either input or output (default).
Input and output modules cannot be mixed within a group.

DeviceExternal Power Consumption(All Relays/SSR Modules On)

USB-PDISO8 Series

Draws 820 mA from the 1.67 A supply

USB-ERB08

Draws 750 mA from the 1.67 A supply

USB-ERB24

Draws 1.5 A from 3 A supply

USB-SSR24

Draws 800 mA from the 1.67 A supply

USB-SSR08

Draws 300 mA from the 1.67 A supply

Some devices may require their own external power supply ina daisy chain configuration

Up to eight optically isolated (500 V) digital input connection pairs are available from the signal I/O connector on
USB-PDISO8 Series devices.

If unsure as to how much current an application requires, MCC
recommends providing separate power to each connected device.

Each signal is applied to a bridge rectifier so that the input is
not polarity-sensitive.

External Power
USB-PDISO8 Series devices require between 6.5 V and 12.5 V
of external power. USB-SSR Series and USB-ERB Series devices
require between 6.0 V and 12.5 V of external power.
An external power connection using the included external power
supply is required to activate relays and SSR modules, and to
run tests in software.
•

USB-PDISO8 Series devices, USB-SSR Series devices, and theUSB-ERB08 are powered by a 9 V, 1.67 A external power
supply (CB-PWR-9) that ships with each device.

•

The USB-ERB24 is powered by an external 9 V, 3 A regulated power supply (CB-PWR-9V3A) that ships with thedevice.

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USB DIO High Voltage and Relay
Software
Software Support
The USB-PDISO8, USB-ERB, and USB-SSR Series devices are supported by the software in the table below.
Ready-to-Run Applications

DAQami™

Data acquisition companion software with drag-and-drop interface that is used to acquire,view, and log data, and generate signals. DAQami can be configured to log analog, digital, andcounter channels, and to view that data in real-time or post-acquisition on user-configurable
displays. Logged data can be exported for use in Excel® or MATLAB®. Windows OS
DAQami is included with the free MCC DAQ Software bundle.

InstaCal™

TracerDAQ™ andTracerDAQ Pro(USB-PDISO8 Series
digital inputs only)

An interactive installation, configuration, and test utility for MCC hardware.

indows OS

InstaCal is included with the free MCC DAQ Software bundle.
Virtual strip chart, oscilloscope, function generator, and rate generator applications used togenerate, acquire, analyze, display, and export data. Supported features may vary by hardware.
The Pro version provides enhanced features. Windows OS
TracerDAQ is included with the free MCC DAQ Software bundle.
TracerDAQ Pro is available as a purchased software download.

General-Purpose Programming Support
Universal Library™
(UL) for Windows

Library for developing applications in C, C++, VB, C# .Net, VB .Net, and Python on Windows.
The UL for Windows is included with the free MCC DAQ Software bundle.
The UL Python API for Windows is available on GitHub (github.com/mccdaq/mcculw).
Library for developing applications in C, C++, and Python on Linux.

UL for Linux®

UL for Linux is available on GitHub (github.com/mccdaq/uldaq).
Open-source, third-party Linux drivers are also available for supported MCC devices.

Application-Specific Programming Suppor
ULx forNI LabVIEW™

DASYLab®

MATLAB Driver®

A comprehensive library of VIs and example programs for NI LabVIEW that is used to develop
custom applications that interact with most MCC devices. Windows OS
ULx for NI LabVIEW is included with the free MCC DAQ Software bundle.
Icon-based data acquisition, graphics, control, and analysis software that allows users to create
complex applications in minimal time without text-based programming. Windows OS
DASYLab is available as a purchased software download. An evaluation version is available for28 days.
High-level language and interactive environment for numerical computation,
visualization, and programming. The Mathworks Data Acquisition Toolbox™ allows users toacquire data from most MCC PCI and USB devices.
Visit www.MathWorks.com for more information about the Data Acquisition Toolbox.

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USB DIO High Voltage and Relay
Specifications - USB-PDISO8 Series
USB-PDISO8 Series Block Diagram

Differential
Isolated Inputs

Form C
Relay Outputs

0 to
7 7
Relays0 to
Inputs0 to
Relays0 to
7 7Signal I/OInputs
Control
Control
Control Connector Control

USB-PDISO8: 24 screw terminals
USB-PDISO8/40: 40-pin connector

Control
Registers

9V
NominalExternal
Power

8
CLo

Power
MonitorCHi
Power
Regulator

Relay
DriverUSB Controller

8Specification

USB 2.0
USB Interface

Voltage range (AC with filter
Input high: 6.0 Vrms min (50 Hz to 1000 Hz)
Input low: 1.5 Vrms max (50 Hz to 1000 Hz)
Response
Filter disabled: 20 µs
Filter enabled: 5 ms
Filters
Time constant: 5 ms (200 Hz)
Filter control: Software-selectable for each input.
Power-up /reset: Filters disabled

All specifications are subject to change without notice
Typical for 25 °C unless otherwise specified

USB-PDISO8 Series
Relay specification

Number: 8
Contact configuration: 8 FORM C (SPDT) NO, NC, and Common available atconnector.
Contact rating: 6 A @ 240 VAC or 28 VDC resistive (refer to Main Connector
on page 5)
Contact resistance: 100 mΩ max
Operate time: 10 ms max
Release time
USB-PDISO8: 5 ms max
USB-PDISO8/40: 10 ms max
Vibration: 10 Hz to 55 Hz (dual amplitude 1.5 mm)
Shock: 10 G (11 ms)
Dielectric isolation: 500 V (1 minute)Life expectancy: 10 million mechanical operations, minPower on RESET state: Not energized. NC in contact to Common.

Power

USB +5 V input voltage range: 4.75 V to 5.25 V
USB +5 V supply current: All modes of operation: 10 mA max
External power input: 9 V nominal
External power supply (required): MCC p/n CB-PWR-9: 9 V @ 1.67 A
Voltage supervisor limits - PWR LED
6.5 V > Vext or Vext > 12.5 V: PWR LED = Off (power fault)
USB-PDISO8 Series devices monitor the external +9 V power supply voltage
with a voltage supervisory circuit. If this power supply exceeds its specified
limit, the PWR LED turns off, indicating a power fault condition.
6.5 V ≤ Vext < 12.5 V: PWR LED = On
External power consumption
All relays on, 100 mA downstream hub power: 820 mA typ, 900 mA max
All relays off, 0 A downstream hub power: 200 mA typ, 230 mA max

Isolated inputs

Number: 8
Isolation: 500 V
Resistance: 1.6 KΩ min
Voltage range (DC)Input high: +5.0 VDC min or –5.0 VDC min
Input low: +1.5 VDC max or –1.5 VDC max
Input range: 30 VDC max

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USB DIO High Voltage and Relay
Specifications - USB-PDISO8 Series
Mechanical

External power output

USB-PDISO8 dimensions (L × W × H)
PCB: 304.3 × 121.9 × 20.0 mm (12.0 × 4.8 × 0.8 in.)		
Enclosure: 342.9 × 125.7 × 58.9 mm (13.5 × 4.95 × 2.32 in.)
USB-PDISO8/40 dimensions (L × W × H)
PCB: 304.3 × 121.9 × 17.8 mm (12.0 × 4.8 × 0.7 in.)
Enclosure: 342.9 × 125.7 × 58.9 mm (13.5 × 4.95 × 2.32 in.)

External power output - current range: 4.0 A max
The daisy chain power output option allows multiple MCC USB products witha USB hub output port to be powered from a single external-power source in adaisy-chain fashion. The voltage drop between the device power supply input
and the daisy-chain output is 0.5 V maximum. Users must plan for this drop
to assure the last device in the chain receives at least 6.5 VDC. A user-supplied
custom cable is required to daisy chain multiple devices.
External power output: Voltage drop between power input and daisy chain
power output: 0.5 V max

Environmental

Operating temperature range: 0 °C to 70 °C
Storage temperature range
USB-PDISO8: -40 °C to 100 °C
USB-PDISO8/40: -40 °C to 85 °C
Humidity: 0% to 95% non-condensing

USB Specification

USB Type-B connector: Input
USB device type: USB 2.0 (full-speed)Device compatibility: USB 1.1, USB 2.0
USB-PDISO8: Hardware revision F and later are also compatible with USB 3.0.
The revision is indicated on the part number label on the housing– 197241X-01 – where X is the hardware revision.
USB-PDISO8/40: Hardware revision C and later are also compatible withUSB 3.0. The revision is indicated on the part number label on the housing– 197242X-01 – where X is the hardware revision.
USB Type-A connector: Downstream hub output port
USB hub type: Supports USB 2.0 high-speed, full-speed and low-speed operating
points; self-powered, 100 mA max downstream VBUS capability
Compatible products: MCC USB products with a USB hub output port
USB cable type (upstream and downstream): A-B cable, UL type AWM 2527 orequivalent (min 24 AWG VBUS/GND, min 28 AWG D+/D-)
USB cable length: 3 meters max

Main Connector

USB-PDISO8
Connector type: Screw terminal
Wire gauge range: 12 AWG to 22 AWG
USB-PDISO8/40
Connector type: P14: 40-pin header
Compatible cables
		 C40FF-x: 40-conductor ribbon cable, female both ends, x = length in feet.
		 C40-37F-x: 40-pin IDC to 37-pin female D connector, x = length in feet.
Compatible accessory products
Using the C40FF-x cable: CIO-MINI40
		 Using the C40-37F-x cable: CIO-MINI37
Max current: 1 A

USB-ERB08 Block Diagram
9.0 V
External
Power
Power
Monitor

Power
Regulator

6

NC C NO

5

ChannelRelay6 3relay

Switch S1(inv/non-inv)

Measurement Computing

8

NC C NO

ChannelRelay4 5relay

ChannelRelay7 2relay

NC C NO

2

ChannelRelay8 1relay

NC C NO

1

4

Load
4

ChannelRelay5 4relay

Relay
Driverdriver7

ChannelRelay3 6relay

NC C NOUSB
Microcontroller

ChannelRelay2 7relay

3

USB
Interface

4

NC C NO

Relay
Driverdriver

NC C NO

ChannelRelay1 8relay

NC C NO

Screw terminal

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USB DIO High Voltage and Relay
Specifications - USB-ERB Series

Relay 13
Relay 12

USB
USB
Interface
InterfaceUSB
Microcontroller

Relay 11

Relay
driverDriver

8

Relay 10
Relay 9
Relay 8SwitchSwitch S1
S1(inv/non-inv))(inv/non-inv)

Relay 7

SwitchSwitch S2
S2(pull-up/down)(pull-up/down))

Relay 6

Relay
Driverdriver

8

Relay 5
Relay 4
Relay 3
Relay 2
Relay 1

USB-ERB Series
Number of relays
USB-ERB08: 8
USB-ERB24: 24
Relay configuration
USB-ERB08: 2 banks of 4
USB-ERB24: 2 banks of 8 and 2 banks of 4
Contact configuratio
USB-ERB08: 8 Form C (SPDT) normally open (NO), normally closed (NC) andcommon (C) available at screw terminals
USB-ERB24: 24 FORM C (SPDT) NO, NC and C available at screw terminals
Contact rating: 5 A @ 240 VAC or 28 VDC resistive
Contact resistance: 100 mΩ max (initial value)
Operate time: 10 ms max
Release time: 5 ms max
Vibration: 10 Hz to 55 Hz (dual amplitude 1.5 mm)
Shock: 10 G (11 ms)
Dielectric isolation
Between relay open contact: 300 VAC, 50/60 Hz (1 minute)
Between PCB output lines: 500 VAC, 50/60 Hz (1 minute)Life expectancy: 10 million mechanical operations, minPower on RESET state
S2 = pull-up: Energized. NO in contact with Common
S2 = pull-down: Not energized. NC in contact with Common(508) 946-5100

23
22
21
20
19
18
17
16
15

Relay control logic polarity: User-configurable per bank through switch S1 forinvert or non-invert (default). Switch settings for polarity can be read back with
software over the USB bus. Switch settings do not affect the power‑on condition.
Non-invert mode: When 0 is written or read back via the USB bus, relays are
not energized.
Invert mode: When 0 is written or read back via the USB bus, relays are energized.
Pull-up/pull-down (controls relay power on state): User-configurable per bankthrough switch S2 for pull-down (default) or pull-up. Switch settings can beread back with software.
• Pull-down puts the relays in non-energized mode on power up.
• Pull-up puts the relays in energized mode on power up.

Output Specification

Measurement Computing

14

Relay 14

13

Relay 15

12

Relay 16Power
Regulator

11

Relay 17

10

Relay 18

9

Relay 19

8

4

7

Relay
Driverdriver

6

Relay 20

5

Relay 21

4

Power
Monitor

Relay 223

9.0 V
External
Power

2

4

1

Relay 23

Relay
Driverdriver24

Screw terminal

Relay 24

NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO NC C NO

USB-ERB24 Block DiagramPower

USB +5 V input voltage range: 4.75 V min to 5.25 V max
USB +5 V supply current (all modes of operation): 10 mA max
Voltage supervisor limits - PWR LED
6.0 V > Vext or Vext > 12.5 V: PWR LED = Off (power fault)
6.0 V ≤ Vext < 12.5 V: PWR LED = On
The daisy chain power output option allows multiple MCC USB Series productswith a USB hub output port to be powered from a single external power source
in a daisy chain fashion. The voltage drop between the device power supply
input and the daisy chain output is 0.5 V max. Users must plan for this drop
to assure the last device in the chain receives at least 6.0 VDC.
External power consumption
All relays on, 100 mA downstream hub power
		 USB-ERB08: 750 mA typ, 850 mA max
		 USB-ERB24: 1.5 A typ, 1.8 A max
All relays off, 100 A downstream hub power
		 USB-ERB08: 170 mA typ, 200 mA max
		 USB-ERB24 230 mA typ, 270 mA max

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USB DIO High Voltage and Relay
Specifications - USB-ERB Series
External Power Input

USB cable type (upstream and downstream): A-B cable, UL type AWM 2527 orequivalent (min 24 AWG VBUS/GND, min 28 AWG D+/D-).
USB cable length: 3 meters max.

External power input: +6.0 VDC to 12.5 VDC (9 VDC power supply included)
External power supply (included)
USB-ERB08
		 MCC p/n CB-PWR-9: 9 V @ 1.67 A
USB-ERB24
MCC p/n CB-PWR-9V3A: 9 V ±10% @ 3 A

Relay Contact Pull-Up/Down Option

Relays NO contact pull-up (to USB +5 V)/pull-down, user installed
USB-ERB08: R1, R3, R5, R7, R10, R12, R14, R16
USB-ERB24: R35, R36, R41, R43, R45, R47, R49, R51, R87, R89, R91, R93, R96,
R98, R100, R102, R103, R105, R107, R109, R112, R114, R116, R118
Relays NC contact pull-up (to USB +5 V)/pull-down, user installed
USB-ERB08: R2, R4, R6, R8, R9, R11, R13, R15
USB-ERB24: R37, R40, R42,R44, R46, R48, R50, R52, R88, R90, R92, R94, R95,
R97, R99, R101, R104, R106, R108, R110, R111, R113, R115, R117

External Power Output

External power output (current range): 4.0 A max
External power output (voltage drop between power input and daisy chain
power output: 0.5 V max
USB-ERB Series devices monitor the external +9 V power supply voltage with a voltage supervisory circuit. If this power supply exceeds its
specified limit, the PWR LED turns off, indicating a power fault condition.
A user-supplied custom cable is required to daisy chain multiple devices.

Mechanical

USB-ERB08 dimensions (L × W × H)
PCB: 203.2 × 121 × 20.0 mm (8.0 × 4.8 × 0.8 in.)
Enclosure: 241.3 × 125.7 × 58.9 mm (9.50 × 4.95 × 2.32 in.)
USB-ERB24 dimensions (L × W × H)
PCB: 431.8 × 121 × 20.3 mm (17.0 × 4.8 × 0.8 in.)
Enclosure: 482.6 × 125.7 × 58.9 mm (19.00 × 4.95 × 2.32 in.)USB Specification

USB Type-B connector: Input
USB device type: USB 2.0 (full-speed)Device compatibility: USB 1.1, USB 2.0
USB-ERB08: Hardware revision E and later are also compatible with USB 3.0. The
revision is indicated on the part number label on the housing – 193776X-01L– where X is the hardware revision.
USB-ERB24: Hardware revision G and later are also compatible with USB 3.0. The
revision is indicated on the part number label on the housing – 193773X-01L– where X is the hardware revision.
USB Type-A connector: Downstream hub output port
USB hub type: Supports USB 2.0 high-speed, full-speed and low-speed operating
points; self-powered, 100 mA max downstream VBUS capability
Compatible products: MCC USB Series devices

Main Connector

Connector type: Screw terminal
Wire gauge range: 12 to 22 AWG

Environmental

Operating temperature range: 0 to 70 °C
Storage temperature range: -40 to 100 °C
Humidity: 0% to 95% non-condensing

USB-SSR08 Block Diagram
9.0 V
External
Power

Power
MonitorSwitch S1(I/O Type)Power
Regulator

SSR modules 1 to 4 (Port C LO)
SSR
moduleSSR
moduleSSR
moduleBidiectional
BufferUSB
Microcontroller
SSR
SSR
modulemoduleSSR
SSR
modulemoduleSSR
SSR
modulemodule4

Bidiectional
Buffer

500 mAUSB 2.0
CompliantInterface

8

7

+-+-

SSR
SSR
modulemodule65

4 3+-+- +-+-

SSR
module

2

1

+-+-

Load

4

SSR modules 5 to 8 (Port C HI)

Screw
Terminal

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USB DIO High Voltage and Relay
Specifications - USB-SSR Series
USB-SSR24 Block Diagram

SSR
Module 4

SSR
Module 3

SSR
Module 2

SSR
Module 1

SSR
Module 7

SSR
Module 8

Power
Monitor

SSR
Module 11

SSR
Module 12Power
Regulator
8USB
Microcontroller
4

Bidiectional
Buffer4

Bidiectional
Buffer

500 mAUSB 2.0
CompliantInterface

SSR
Module 24

SSR
Module 23

SSR
Module 22

SSR Modules 17-20 (Port CL)

I/O module logic polarity: Selectable with switch S2. Switch settings for polarity
can be read back with software. Default to non-inverted. For input modules,
invert mode returns a 1 when module is active; non-invert mode returns a
0 when module is active. For output modules, invert mode allows users towrite a 1 to activate the module; non-invert mode allows users to write a 0 to
activate the module.
Pull-up/pull-down on digital I/O lines: Configurable with switch S3 with 2.2 kΩresistor network. Switch settings for pull-up/pull-down selection can be readback with software. Default to pull-up. Switch settings are applicable during
power up conditions of output modules only. Modules are active Low. Whenswitch to Pull-up, modules are inactive on power up. When switched to pulldown, modules are active on power up.

USB-SSR08
Modules 1-4: Selectable with switch S1 in the CL position as either input or
output (default) modules. Switch settings for direction can be read back with
software. Do not mix input and output modules within this bank of four.
Modules 5-8: User-selectable with switch S1 in the CH position as either input
modules or output (default) modules. Switch settings for direction can be readback with software. Do not mix input and output modules within this bank offour.
USB-SSR24
Modules 1-8: Selectable with switch S1 in the A position as either input or
output (default) modules Switch settings for direction can be read back with
software. Do not mix input and output modules within this bank of eight.
Modules 9-16: Selectable with switch S1 in the B position as either input
modules or output (default) modules. Switch settings for direction can be readback with software. Do not mix input and output modules within this bank ofeight.
Modules 17-20: Selectable with switch S1 in the CL position as either input or
output (default) modules. Switch settings for direction can be read back with
software. Do not mix input and output modules within this bank of four.
Modules 21-24: Selectable with switch S1 in the CH position as either input or
output (default) modules. Switch settings for direction can be read back with
software. Do not mix input and output modules within this bank of four.

(508) 946-5100

Switch S2(Inv/Non-Inv)
Switch S3(Pull-Up/Down)

SSR Modules 21-24 (Port CH)

I/O Module Configuratio

Measurement Computing

Bidiectional
Buffer

SSR
Module 16
SSR
Module 20

SSR
Module 15
SSR
Module 19

SSR
Module 14
SSR
Module 18

SSR
Module 13

SSR Modules 9-16 (Port B)

SSR
Module 17

16 15
18 17
24 23 22 21+-+- +-+- +-+-

20 19

Screw terminal+-+- +-+- +-+-

14 13

Load

SSR
Module 21

12 11

10 9

8

SSR
Module 6

Bidiectional
Buffer

SSR
Module 10+-+- +-+- +-+-

7

8

SSR
Module 5

6

5

4 3

+-+- +-+-SSR Modules 1-8 (Port A)

9.0 V
External
Power

SSR
Module 9

2

1

+-+-

Switch S1(I/O Type)Power

USB +5 V input voltage range: 4.75 V min to 5.25 V max
USB +5 V supply current (all modes of operation)
USB-SSR08: <100 mA
USB-SSR24: 10 mA max
External power supply (included; required for USB-SSR24): MCC p/n CB-PWR-9
9 V @ 1.67 A
Voltage supervisor limits - PWR LED
6.0 V > Vext or Vext > 12.5 V: PWR LED = Off (power fault)
6.0 V ≤ Vext < 12.5 V: PWR LED = On

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USB DIO High Voltage and Relay
Specifications - USB-SSR Series
Digital I/O Transfer Rates

External power consumption
All modules on, 100 mA downstream hub power
		 USB-SSR08: 300 mA typ, 360 mA max
		 USB-SSR24: 800 mA typ, 950 mA max
All modules off, 0 mA downstream hub power
		 USB-SSR08: 180 mA typ, 220 mA max
		 USB-SSR24: 200 mA typ, 220 mA max

Digital I/O transfer rate (software paced): System dependent, 33 to 1000 port
reads/writes or single bit reads/writes per second typ.

Mechanical

USB-SSR08 dimensions (L × W × H)
PCB (without modules): 8.0 × 4.8 × 0.885 in. (203.2 × 121.9 × 22.5 mm)
Enclosure: 9.50 × 4.95 × 2.32 in. (241.3 × 125.7 × 58.9 mm)
USB-SSR24 dimensions (L × W × H)
PCB (without modules): 431.8 × 121.9 × 22.5 mm (17.0 × 4.8 × 0.885 in.)
Enclosure: 482.6 × 125.7 × 58.9 mm (19.00 × 4.95 × 2.32 in.)

External Power Input

External power input: +6.0 VDC to 12.5 VDC (9 VDC power supply included)
External power supply (included; required for USB-SSR24)
MCC p/n CB-PWR-9: 9 V @ 1.67 A

Main connector

External Power Output

Connector type: Screw terminal
Wire gauge range: 12 to 22 AWG

External power output (current range): 4.0 A max
USB-SSR Series devices monitor the external +9 V power supply voltage with avoltage supervisory circuit. If this power supply exceeds its specified limit, thePWR LED turns off, indicating a power fault condition.
External power output (voltage drop between power input and daisy chain
power output: 0.5 V max
The daisy chain power output option allows multiple MCC USB boards to be
powered from a single external power source in a daisy chain fashion. The
voltage drop between the module power supply input and the daisy chain
output is 0.5 V max. Users must plan for this drop to assure the last module inthe chain receives at least 6.0 VDC. A user-supplied custom cable is required
to daisy chain multiple devices.

SSR Digital I/O Modules
Specifications for the SSR modules available for the USB-SSR Series are listed belo .
Digital Input Sensing Modules

USB Specification

USB Type-B connector: Input
USB device type: USB 2.0 (full-speed)Device compatibility: USB 1.1, USB 2.0
USB-SSR Series revision F and later are also compatible with USB 3.0. The revision determined from the part number label on the housing as follows:
USB-SSR08: The part number label on the housing shows as 193779X-01L,
where X is the hardware revision
USB-SSR24: The part number label on the housing shows as 93782X-01L, where
X is the hardware revision

MCC part
number

Input
type

Isolation
voltage

Input
voltage
range

Input
current@ max line

Turn-ontime

Turn-offtime

SSR-IAC-05

AC4000 Vrms

90-140VAC/DC

8 mA

20 ms

20 ms

SSR-IAC-05A

High voltage
AC4000 Vrms

180-280
VAC/DC

6 mA

20 ms

20 ms

SSR-IDC-05

DC

4000 Vrms

3-32 VDC

18 mA

0.20 ms

0.40 ms

Non-polarized,
15-32 VAC,
4000 Vrms
AC or DC
10-32 VDC

18 mA

5 ms

5 ms

SSR-IDC-05NP

Digital Output Switching Modules

USB Type-A connector: Downstream hub output port
USB hub type: Supports USB 2.0 high-speed, full-speed and low-speed operating
points; self-powered, 100 mA max downstream VBUS capability
Compatible products: MCC USB Series devices
USB cable type (upstream and downstream): A-B cable, UL type AWM 2527 orequivalent (min 24 AWG VBUS/GND, min 28 AWG D+/D-).
USB cable length: 3 meters max.

MCC part
numberOutputtype*

Isolation
voltageLoadvoltagerange

Loadcurrent
range

Turn-ontime

Turn-offtime

SSR-OAC-05

AC4000 Vrms

24-140VAC

0.03-3.5 A

8.33 ms

8.33 ms

SSR-OAC-05A

AC

4000 Vrms

24-280VAC

0.03-3.5 A

8.33 ms

8.33 ms

SSR-ODC-05

DC

4000 Vrms

3-60 VDC

0.02-3.5 A

20 µs

50 µs

SSR-ODC-05A

DC

4000 Vrms 4-200 VDC 0.02-3.5 A

75 µs

750 µs* SPST, normally open

Measurement Computing(508) 946-5100

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USB DIO High Voltage and Relay
Ordering
Order Information

SSR Digital I/O Modules (USB-SSR Series Only)

HardwarePart No.

Description

USB-PDISO8

USB-based eight Form C relay and eight isolated highvoltage input interface device. Includes power supply
and USB cable.

USB-PDISO8/40

USB-based eight Form C Relay and eight isolated highvoltage input interface device with 40-pin connector.
Includes power supply and USB cable.

USB-SSR08

USB-based solid-state eight I/O module interface
device. Includes power supply and USB cable.

USB-SSR24

USB-based solid-state 24 I/O module interface device.
Includes power supply and USB cable.

USB-ERB08

USB-based 8-channel electromechanical relay interface
device. Includes power supply and USB cable.

USB-ERB24

USB-based 24-channel electromechanical relay
interface device. Includes power supply and USB cable.

Description

SSR-IAC-05

AC sense input module, 90 to 140 VAC/VDC

SSR-IAC-05A

AC sense input module, 180 to 280 VAC/VDC

SSR-IDC-05

DC sense input module, 3 to 32 VDC

SSR-IDC-05NP

DC sense input module, 10 to 32 VDC non-polarized

SSR-OAC-05

AC switch output module, 24 to 140 VAC,
3.5 A @ 120 VAC, SPST normally open

SSR-OAC-05A

AC switch output module, 24 to 280 VAC,
3.5 A @ 240 VAC, SPST normally open

SSR-ODC-05

DC switch output module, 3 to 60 VDC @ 3.5 A, SPST
normally open

SSR-ODC-05A

DC switch output module, 4 to 200 VDC @ 3.5 A, SPST
normally open

Software also Available from MCC
Part No.

Accessories and Cables

Description

TracerDAQ Pro

Out-of-the-box virtual instrument suite with strip
chart, oscilloscope, function generator, and rate
generator – professional version

DASYLabIcon-based data acquisition, graphics, control, andanalysis software*

Part No.

Description

CB-PWR-9

Replacement power supply, 9 V, for USB-PDISO8 Series,
USB-SSR Series, and USB-ERB08. Interchangeable powerplugs are available separately.

CB-PWR-9V3A

Replacement power supply, 9 V, for USB-ERB24

PS-9V1AEPS230V

Replacement 230 V power supply, 9 V output, for
USB-PDISO8 Series, USB-SSR Series, and USB-ERB08.
Interchangeable power plugs are available separately.

CIO-MINI40

Part No.

* TracerDAQ Pro only supports USB-PDISO8 Series digital inputs; it does notsupport USB-ERB Series or USB-SSR Series devices.

Universal screw-terminal board, 37-pin

Measurement Computing
DS USB-High-Voltage-Relay-DIO(508) 946-5100

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June 2021. Rev 4© Measurement Computing Corporation