1 FUNCTIONS
1.17 Redundant System Function
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1.17 Redundant System Function
The redundant system function improves system reliability by mounting the RJ71EN71s on the base units of both systems of
a redundant system so that the new control system can continue communication even if an error occurs on the line for the
control system.
When using the redundant system function, check the versions of the CPU module and the RJ71EN71. ( Page 406
Added and Enhanced Functions)
To switch the system when a communication error or cable disconnection on Ethernet is detected, use the
RJ71EN71.
The system is not switched when a communication error or cable disconnection in the CPU module (built-in
Ethernet port part) occurs.
System configuration
This section describes the redundant system configuration using the RJ71EN71s.
The Process CPU, redundant function module, and RJ71EN71 are mounted on the base units of both systems of a redundant
system.
A redundant system is configured by connecting the RJ71EN71s in both systems together using Ethernet cables.
Set the network type for the RJ71EN71 to either of the following.
• "Port 1 Network Type" and "Port 2 Network Type" are set to "Ethernet".
• "Port 1 Network Type" is set to "Q Compatible Ethernet".
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