Hardware reference guide

DIO
264
35013379 02 October 2007
Specifications The following specifications are for the Modbus Plus CRA21120 and CRA21220 DC
powered single and dual channel DIO modules.
Specifications
Input Requirements
Input Voltage 20 ... 30 Vdc
Input Current 1.6 A
Inrush Current 30 A
Input Power Interruption 1.0 ms max
Fusing (external) 2.5 A (Part #043503948 or equivalent)
Operating Mode Standalone or not powered (See Power and Grounding
Guidelines, p. 775).
Output to Bus
Voltage 5.1 Vdc
Current 3 A
Minimum Load 0 A
Protection Over Current, Over Voltage
Communication
Modbus Plus 1 port (single cable). 2 ports (dual cable)
General
Specifications I/O Type Quantum
Modules/Drop Depends on bus current loading and
word count
Words 30 In / 32 Out. (Two additional input
words are reserved for drop status)
Diagnostics Power Up Runtime
RAM Data/Address
Executive Checksum
Field Wiring Connector 7 point terminal strip (Part #043503328)
Internal Power Dissipation 2.0 V + 3.0 V x I
BUS
= Watts (where I
BUS
is in Amperes)
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com