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19GFK-0827 Chapter 2 System Components
Redundancy Communications Module
The Redundancy Communications Module (RCM), catalog number IC697RCM711, provides
a communications path for sharing data between the two CPUs in the redundant system.
In a synchronized system, I/O data is controlled by one unit (the active unit) but is shared
between both units (active and backup units). The RCM provides the communications path
between the two units. An RCM must be configured in both the Primary PLC and the
Secondary PLC. The RCM must reside in rack 0 and there can be no empty slot between
the RCM and the CPU (there can be other modules).
RCM Features
The following figure shows the features of the RCM module.
REMOTE SYSTEM
MODULE FUNCTION
ACTIVE
RCM 711
BOARD OK
LOCAL SYSTEM
READY
ON = TRUE
MODULE
IC697RCM711
LABEL:
44A726758–136R02
EXPANSION
50 FT. MAXIMUM
CABLE LENGTH FROM
BEM 713 TO TO RCM711
REDUNDANCY
COMMUNICATIONS
MODULE
LOCAL SYSTEM
ACTIVE
REMOTE SYSTEM
READY
MODULE.
HIGH SPEED INTERFACE
BETWEEN HOT.
CONNECT TO END
OF EXPANSION BUS
DEPRESS 1 SEC.
OK
LOCAL READY
LOCAL ACTIVE
REMOTE READY
REMOTE ACTIVE
REDUNDANCY
COMMUNICATIONS
TO SWITCH ACTIVE
CPU (MIN 10 SECS
BETWEEN SWITCHES)
STANDBY REDUNDANCY
SUPPORTED CPUs.
PORT IN
(TOWARDS CPU)
TO BEM711
OR BEM713
(USE TERMINATED
CABLE CBL811
OR CBL826)
UNUSED PORT
DO NOT INSTALL
CABLE OR
TERMINATOR
a47004
Figure 5. Redundancy Communications Module - IC697RCM711