Mitsubishi Electric MELSEC iQ-R-R04CPU - Chapter 30 Maintenance and Inspection for a Redundant System; Module Replacement in the Redundant System

516
30 MAINTENANCE AND INSPECTION FOR A REDUNDANT SYSTEM
30.1 Module Replacement in the Redundant System
30 MAINTENANCE AND INSPECTION FOR A
REDUNDANT SYSTEM
This chapter describes the maintenance and inspection for a redundant system.
30.1 Module Replacement in the Redundant System
The following describes the methods of replacing modules in a redundant system while the system is operating.
• Replacing modules in a control system with the online module change function
• Replacing modules in a standby system (To replace modules in a standby system, power off the standby system or use the
online module change function.)
: Replaceable, : Not replaceable
*1 This module in a redundant power supply system can be replaced.
*2 To replace this module without powering off the system, use the online module change function. ( MELSEC iQ-R Online Module
Change Manual)
*3 When an error has been detected on a redundant function module in the control system, a continuation error occurs on the CPU
module, and the control system and the standby system continue operating without being switched. Perform online module change if the
redundant function module has failed. ( MELSEC iQ-R Online Module Change Manual)
*4 Use the online module change function. ( MELSEC iQ-R Online Module Change Manual)
Since the standby system needs to be powered off for replacing their modules, a continuation error occurs on
the CPU module of the control system. After the replacement, clear the continuation error that has occurred
on the CPU module of the control system. ( Page 133 Error Clear)
The following describes how to replace modules in the standby system (by powering off the standby system).
Replacement target Replacement Reference
Control system Standby system
CPU module Page 517 Replacing a CPU module
Power supply module Page 519 Replacing a power supply module
Redundant power supply module 
*1
 Page 519 Replacing a redundant power supply module
Redundant function module 
*3

*2
Page 520 Replacing a redundant function module
I/O modules 
*4

*2
Page 520 Replacing I/O modules
Network module Page 521 Replacing a network module
Main base unit Page 521 Replacing a main base unit