DBK208

16-Channel Isolated Digital I/O Signal ConditioningFeatures• Accepts up to sixteen Opto 22®-compatible isolated solid-state-relay (SSR)
digital I/O modules*• 500 VDC channel-to-channel andchannel-to-system isolation• Modules available for sensing AC andDC signals and switching AC and DCloads• Modules are jumper configured aseither inputs or outputs in groups ofeight• Per channel screw terminals (12-26AWG) for easy signal connection plus
LEDs to indicate module status• On-board logic permits the disablingof outputs upon external power loss
• On-board logic disables outputs upondetection of a CPU reset• Up to sixteen DBK208 boards can bedaisy-chained supporting expansion
up to 256 isolated digital I/O lines• Easily configured, without programming, with DaqView software• Optionally rack and DIN-rail­ ountablem• Requires +5 VDC power supply

The DBK208 accepts up to 16 isolated solid-state-relay (SSR) digital I/O modules

DBK208 Block Diagram
SIGNAL I/O
P4

An on-board jumper (JP2) allows users todetermine the status of the digital outputs
in the event of the loss/recovery of external
power. When enabled, the loss of external
power disables module ­outputs until theapplication program writes new values tothe data bus. When disabled, the loss ofpower has no effect on the state or continued control of the outputs. Additionally,
on-board logic disables module outputs
upon detection of a CPU reset.
Measurement Computing

OutputJP0

EnableInput

Disable+5 VDC
JP2
8

Watchdog
Data bus

Data bus

Reset

Reset

24

Read/write

Read/write

Address
recognition
stageAddress
Digital I/O expansion

Fudn ec ct oi do enBank 08I/O
control

EnableAddress = XXXX0
Two banks of 8 I/O modules(16 modules total)

16 8 4 2

The DBK208 signal conditioning and expansion board can be configured with up
to 16 isolated Opto-22® compatible solidstate relay (SSR) digital I/O modules. Two
8-channel banks can be jumper-­selected
as either inputs or outputs. Each channel
features screw terminals for the convenientconnection of field signals as well as LEDs
to indicate channel status.
Each user-configurable signal conditioning module offers 500V isolation fromthe system and from other channels. Awide variety of solid-state-relay (SSR) I/O
modules are available to sense AC and DC
signals and to switch AC and DC loads.

External power
watchdog

P2

S1

P2

Card address
dipswitch(4 position)
On-board P2 connectors for
digital I/O expansion orconnection to Daq system P2

EnableRead/write
Reset
Data bus

PowerenableF
udn ec ct oi do en

Bank 1
8I/O
control
Address = XXXX1Watchdog+5 VDC
OutputExternal power

JP1Input
Power to solid state relays (SSRs)

For DaqBoard/2000 Series only a single CA195 cable is required to terminate to theDBK208. For applications with digital I/O
only channel expansion requirements, up
to 16 DBK208 boards can be daisy chained(via multiple CA-37-x cables) providing expansion up to 256 digital I/O channels. For­applications with both ­analog and ­digitalI/O ­channel expansion requirements, theDBK206 and the DBK209 ­expansion boards
are available. All DBK signal conditioning
and expansion boards are scanned at 5 µs/channel.
The DBK208 ships with panel-mount hardware, however it can also be either DIN-railor rack-mounted with optional mounting
kits. The DBK209 and DBK206 adapter(508) 946-5100

1boards are used to convert the 100-pin (P4)­connector from the DaqBoard/2000 Seriesboards to three ­expansion ports (P1, P2,and P3). These (DB37) connectors interface
to a broad range of analog and digital DBK

Rack3 rack-mount kit for the DBK208* OPTO 22® modules must be purchased separately.
All sales are final with no right of return.

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DBK208

Specifications & Ordering Information
Ordering Information

DBK208 Expansion Examples

P2Description
Part No.
Termination and expansion board with
fixed screw terminals (12 to 26 AWG wire),sockets for up to sixteen Opto-22®-compatible
isolated solid-state-relay (SSR) digital
I/O modules, and status LEDs perchannel; provides direct connection
for digital DBK signal conditioning
and expansion options
DBK208Termination and expansion board withremovable screw terminals for access toDBK209
all DaqBoard/2000 Series I/O with direct
adapter board
connection for DBK signal conditioning
panel mounted
and expansion options
DBK206
CA-195
Expansion board for direct connection
DBK208to DBK signal conditioning and(2) carrier board
expansion options
DBK209for
Opto-22® compatible

P2Accessories

MonitorIndustrial
Panel-Mount PC
with DaqBoard/2000
series board installed

CA-195

DBK208(2) signal conditioning andexpansion board for Opto-22®compatible solid-state-relay (SSR)
modules; analog and digital
expansion; mounted using Rack3

Rack-mount kit for DBK206, DBK207,
DBK207/CJC, DBK208, DBK209,
and DBK210 signal terminationand expansion boards
DIN-rail adapter kit for DBK206, DBK207,
DBK207/CJC, DBK208, and DBK210
signal termination and expansion boards
DIN-rail adapter kit for DBK209 signal
termination and expansion board

CA-37-1
NEMA Enclosure

Two DBK208 isolated digital signal conditioning andexpansion boards (16 max) using Rack3 mounting option

Ribbon cable for connecting DBK Series
expansion options; where x is thenumber of DBK devices attached100-conductor expansion cable,
mates with the DaqBoard/2000 Seriesboards and the DBK200, DBK202,
DBK203A, DBK206, DBK207,
DBK207/CJC, DBK208, DBK209,and DBK210;		 3 ft. expansion cable		 6 ft. expansion cable
Same as CA-195 with
CE compliance; 3 ft.

Ethernet
DaqBookP2

P3CA-37-1
P2

DBK208 signal conditioning and expansion
board for Opto-22®-compatible
solid-state-relay (SSR) modules; analogand digital expansion

The DaqBook/2001 with one DBK208 isolated digital
signal conditioning and expansion board (16 max)
signal conditioning boards and ­modules.
The DBK209 is typically used for applications where both isolated analog input(DBK207 and/or DBK207/CJC) and isolated digital I/O (DBK208 and/or DBK210)­channel expansion is required. The DBK206
supports the same channel expansion asthe DBK209 plus removable screw-teminals
providing access to all DaqBoard/2000 ­Series
I/O. Both the DBK206 and the DBK209 arepanel mountable and rack and DIN-rail­mountable with optional kits.

Measurement Computing

Specifications

DIN1
DIN2

2

CA-37-x

CA-195
CA-195-6
CA-209Product Compatibility

Module Capacity: 16, Opto-22® solid-state-relays
Cable (optional): CA-37-x or CA-195
DC Input Fuse: 0.5A, reset type
Power Requirement: 5 VDC, regulated; 0.25A min
Operating Environment
Temperature: 0 to 70 ˚C
Relative Humidity: 95% RH, non-condensingConnectors
P4: 100-pin connector provides for connection toDaqBoard/2000 Series P4 connector via a CA-195
cable
P2: Two P2 (DB37) connectors provide connection
to a Daq system and digital expansion via a single
CA-37-x cable or multiple CA-37-1 cables
Screw Terminals: 16 sets of 2-connector blocks
for I/O signals
Isolation
Channel-to-System: 500V
Channel-to-Channel: 500V(508) 946-5100

Rack3

Cables

Notebook PC

P1solid-state-relay (SSR) modules
analog and digital expansion
mounted using Rack3✔ LogBook✔ DaqBook✔ DaqLab✔ DaqScan✔ DaqBoard/2000 Series

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