Communication Module Requirements

At least one communication module is required in the same slot of each redundant chassis. Follow these requirements for communication modules in a redundant chassis with
ControlLogix®
 5590 redundant controllers:
  • The following catalog numbers are supported:
    1756-EN4TR, 1756-EN4TRK, 1756-EN4TRXT, 1756-EN2TP, 1756-EN2F/C,
    1756-EN2TR/C
    , 1756-EN2T/D
  • For communication between a redundant controller and
    safety
     I/O in a remote chassis, you must use a 1756-EN4TR, 1756-EN4TRK, or 1756-EN4TRXT communication module that is configured for concurrent communication. See Concurrent Communication to I/O.
  • Use any combination of up to seven communication modules in each redundant chassis.
  • Do not use the USB ports of communication modules to access the redundant system network while the system is online. Use of the USB ports while online can result in a loss of communication of traffic through the USB port after a switchover.
  • Use the same firmware levels in a partnered set. The series for communication modules is not required to match in a partnered set. However, if your application requires a feature specific to a module series level, you must use the same series level for each module. For example, only the 1756-EN2T/C communication module offers the double-data rate (DDR) feature. You must use 1756-EN2T/C modules or later in each chassis of the redundant chassis pair to use DDR.

Plan for Communication Module Connections

A
CIP™
 connection is a point-to-point communication mechanism that is used to transfer data between a producer and a consumer. These mechanisms are examples of
CIP™
 connections:
  • Logix 5000®
     controller message transfer to
    Logix 5000®
     controller
  • I/O or produced tag
  • Program upload
  • PanelView™
     polling of a
    Logix 5000®
     controller
EtherNet/IP™
 communication modules use
CIP™
 connection to connect devices. Three
CIP™
 connections are reserved for redundancy. You can use the remaining connections in any manner that your application requires.
To determine the total number of
CIP™
 connections supported by your communication module, see the ControlLogix Communication Modules Specifications Technical Data, publication 1756-TD003.
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