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

1.5

Redundant System Function

The redundant system function improves system reliability by mounting RJ71LP21-25 modules on the base units of both
systems of a redundant system 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.
• Process CPU
• Redundant function module
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))

System configuration

This section describes the RJ71LP21-25 redundant system configuration.
The RJ71LP21-25s are mounted on the base units of both systems of a redundant system.
A redundant system is configured by connecting the RJ71LP21-25s in both systems together using optical fiber cables.
(1) (2)
(1) Control station (station No.1) as the control system (system A)
(2) Normal station (station No.2) as the standby system (system B)
(3) Normal station (station No.3)
(4) Normal station (station No.4)
(3) (4)
1 FUNCTIONS
1.5 Redundant System Function
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