DBK2324-Channel Optically Isolated Digital-Input Module
Features• Provides 24 isolated digital inputs• Optically isolated inputs accept up to30 VDC• 500V channel-to-channel isolation• 500V channel-to-system isolation• Expandable to 192 digital lines
The DBK23 is a 24-line digital-input ­modulethat provides isolated digital inputs for
IOtech’s data acquisition systems. The unit
provides 500V of channel-to-­channel and
500V of channel-to-system optical isolation,
eliminating troublesome ground loops andprotecting the data acquisition system fromdamage caused by accidental contact withhigh external voltages. Up to eight DBK23modules can be connected to one system
for a total of 192 digital inputs.
Applications. The DBK23 can monitor arange of 3 to 30 VDC inputs, making it
especially suitable for applications such asprocess control or laboratory automation.
The unit is capable of monitoring electricaldevices such as proximity switches, thermostats, and limit switches. When usedin conjunction with the DBK24 isolated
digital-output module, the DBK23 canmonitor one segment of a process and theDBK24 can control another.

The DBK23 adds 24 isolated digital inputs to the LogBook, DaqBook, DaqBoard/2000 Series,
and DaqScan

DBK23 Optically Isolated Digital-Input Module Block Diagram
P2HiControl 2OPTO
isolator

LoInput 24Signal
Inputs
HiDigital
interface tosystem

Data

OPTO
isolatorLo

Address 68Input 1Connections. The DBK23 connects to asystem’s digital I/O connectors and uses
the digital I/O lines as a communications
bus. Thus, the lines on a system’s digital I/O
connectors are not user accessible when a
DBK23 is in use. The DBK23 can be daisychained with other DBK digital I/O cards
or modules via optional expansion cables.
Signal connections to the DBK23 are madevia screw terminals, which are conveniently
located on its slide-out PC board.

VccHiLo

Typical of 24

Power. The DBK23 is equipped with aninternal power supply and external ACadapter. It can also be powered from a
DBK30A battery/excitation module, a12 VDC car battery, or from any 9 to24 VDC source.

Measurement Computing(508) 946-5100

1

info@mccdaq.com

mccdaq.com

DBK23Specifications & Ordering Information
Specifications

24 optically isolated digital-input channels readablein 8-bit groups
Connector: DB37 male, mates with P2*; screw terminals for signal outputs
Input Channel Ratings
Range: 3 to 30 VDC
Input Current: 1.5 to 15 mA
Operating Voltage Range: 9 to 24 VDC
Module Power Requirements: 0.25W; AC adapter
included
120 VAC Adapter Supplied: 15 VDC @ 0.9A
Indicators: Local power and system power LED
Controls: Power on/off
Isolation Voltage
Channel-to-Channel: 500V
Channel-to-System: 500V
Channel Address: Set by dip-switch
Dimensions: 285 mm W x 221 mm D x 35 mm H(11” x 8.5” x 1.375”)
Weight: 1.2 kg empty (3 lbs)
Power Consumption:  10 mW

Ordering Information
Description
24-channel optically isolated
digital-input module

Product Compatibility
Part No.
DBK23

Accessories & Cables
Rack mount kit
Molded T expansion cable; 2 in.
Molded T expansion cable; 4 in.
Ribbon cable, where x is the numberof DBK devices attached✔ LogBook✔ DaqBook✔ DaqLab✔ DaqScan✔ DaqBoard/2000 Series

RackDBK2
CA-255-2T
CA-255-4T
CA-37-x

Note: The CA-37-x ribbon cable can also be usedin lieu of the CA-255-x molded T cables.

* Attachment to the DaqBoard/2000 Series requires a DBK202, DBK203A, DBK209, DBK213, or DBK214

Measurement Computing(508) 946-5100

2

info@mccdaq.com

mccdaq.com