The Allen-Bradley 1771-DXPS module, part of the 1771 control coprocessor series, is designed to efficiently handle 7-bit reception with even-parity as an expander module. It features optically-isolated serial communication through its COMM 2 and COMM 3 ports, compatible with EIA RS-232C, -423, and -485 standards, and provides data visualization via its ASCII display. This module includes a spring-loaded key switch for reinitializing without power cycling and is equipped with status LEDs for communication ports and a fault relay for signaling issues, requiring careful handling due to its sensitivity to Electrostatic Discharge (ESD).
Technical specifications for 1771-DXPS
Manufacturer
Rockwell Automation
Brand
Allen-Bradley
Part Number/Catalog No.
1771-DXPS
Module Type
Communication Module
Description
Control Coprocessors
Communication Port Protocol
RS-232-C, RS-422-A, RS-423-A, and Ethernet TCP/IP
Operation
BASIC Programs, C Programs, Assembly Programs, and Real-Time Multitasking Operating System (OS/9)
Communication w/ PLC Processor
Block-Transfer w/ PLC Processor and Direct Connection to Channel 3 of PLC-5 Processor
Max DC Off-State Current
1.0 Miliamperes
Typical DC Signal Delay (On)
33 (+/- 6) ms Contact Status and 3 (+/- 2) ms Wire-Fault Status
Typical DC Signal Delay (Off)
33 (+/- 6) ms Contact Status and 3 (+/- 2) ms Wire-Fault Status
