Mitsubishi Electric MELSEC iQ-R Series - Chapter 35 Maintenance and Inspection of a Redundant System; Module Replacement in a Redundant System

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35 MAINTENANCE AND INSPECTION OF A REDUNDANT SYSTEM
35.1 Module Replacement in a Redundant System
35 MAINTENANCE AND INSPECTION OF A
REDUNDANT SYSTEM
This chapter describes the maintenance and inspection of a redundant system.
35.1 Module Replacement in a Redundant System
Overview
■Replacing a module on the main base unit of the control system
• A module can be replaced by turning on SM1646 (System switching by a user) to execute system switching and powering
off the main base unit in the standby system after system switching.
• A module supporting the online module change function can be replaced by online module change.
■Replacing a module on the main base unit of the standby system
• A module can be replaced by powering off the main base unit of the standby system.
• In a redundant system without extension base units, a module supporting the online module change function can be
replaced by online module change. (In a redundant system with redundant extension base unit, a module on the main base
unit of the standby system cannot be replaced by online module change.)
■Replacing a module on an extension base unit
• A module supporting the online module change function can be replaced by online module change.
• When replacing a module not supporting the online module change function, power off both systems before replacing.
Replacement of each module
The following table lists modules and whether each module can be replaced.
: Replaceable, : Not replaceable, : Inapplicable
Replacement
target
Availability Reference
Redundant system without
extension base units
Redundant system with redundant extension
base unit
Module on the
main base unit
of the control
system
Module on the main
base unit of the
standby system
Module on the
main base unit
of the control
system
Module on the main
base unit of the
standby system
Module
on an
extension
base unit
While power is
on
After
powered
off
While
power is
on
While power is
on
After
powered
off
While
power is
on
While
power is
on
CPU module 
*2

*2
 Page 542 Replacing the
CPU module
Power supply
module

*2

*2
 Page 544 Replacing the
power supply module
Redundant power
supply module

*1

*1

*1

*1

*1
Page 544 Replacing the
redundant power supply
module
Redundant function
module
Page 545 Replacing the
redundant function
module
I/O module Page 545 Replacing the
I/O module
Intelligent function
module

*3*4

*3

*3*4

*3
Page 546 Replacing the
intelligent function
module