Redundant System Function; System Configuration - Mitsubishi Electric MELSEC iQ-RJ71EN71 User Manual

1.7

Redundant System Function

The redundant system function improves system reliability by making the RJ71GF11-T2 or the remote head module
redundant so that the new control system can continue data link even if an error occurs in the control system.
The following modules are required to use the redundant system function in the Process CPU.
• Process CPU
• Redundant function module
• The RJ71GF11-T2 with a firmware version of "12" or later
The following modules are required to use the redundant system function in the SIL2 Process CPU.
• SIL2 Process CPU
• SIL2 function module
• Redundant function module
• RJ71GF11-T2 with a firmware version of "25" or later
When using a redundant system, check the versions of the Process CPU and the engineering tool. (
MELSEC iQ-R CPU Module User's Manual (Application))
When using the safety communication function in the SIL2 Process CPU, refer to the chapter explaining the
safety communication function in this manual. ( Page 112 System using the SIL2 Process CPU)

System configuration

This section describes the configuration of a redundant system on CC-Link IE Field Network.
A redundant system on CC-Link IE Field Network is configured as below.
System configuration
Redundant master station
Redundant slave station
Redundant line
There are no network topology restrictions even when a redundant system is configured. However, configuring a redundant
system using ring topology is recommended, because if a cable disconnection occurs or a faulty station occurs in a system
other than the redundant system, system switching can be avoided by the loopback function.
When configuring CC-Link IE Field Network containing a redundant system, the master/local module with a
firmware version of "12" or later must be used for the master and local stations.
The following modules must be used for the MELSEC Q/L series local stations.
• MELSEC-Q series: Local station with a serial number (first five digits) of "18042" or later
• MELSEC-L series: Local station with a serial number (first five digits) of "18042" or later
MELSEC-QS series local stations cannot be used.
When connecting the GOT or CC-Link IE Field Network interface board, refer to the manual for the product
used.
Description
The master station is configured in a redundant system.
The slave station is configured in a redundant system.
Each of the control system and standby system is configured on a
different network to make the network line redundant.
Reference
Page 80 Redundant master
station
Page 80 Redundant slave
station
Page 81 Redundant line
1 FUNCTIONS
1.7 Redundant System Function
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