Replacing Module In Redundant System; Cpu Module Replacement - Mitsubishi Q12PRHCPU User Manual

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TROUBLESHOOTING

8.3 Replacing Module in Redundant System

8.3.1 CPU Module Replacement

(1) CPU Module Replacement
The control system CPU module cannot be replaced while redundant systems are
running.
When replacing the control system CPU module, use GX Developer to switch its
system to the standby system, then, start the replacement operation.
Replace the standby system CPU module after powering off the standby system.
The standby system can be powered off even while the redundant system is running.
(2) Replacement Procedure
The procedure for replacing the CPU module is shown in Diagram 8.21.
Confirming the System of the Replacement Target CPU Module
Confirm that system of the target CPU module is the standby system (the CONTROL LED is
off).When replacing the control system CPU module, switch its system to the standby system using
GX Developer.
Refer to Section 8.3.1, for system switching using GX Developer.
Power OFF the Standby System
CPU module
Control system
Replace after using GX Developer to
GX Developer
switch over to the standby system.
Diagram 8.19 System where Control System CPU Module is Replaced
Control system
GX Developer
Diagram 8.20 System where Standby System CPU Module is Replaced
Start
8.3 Replacing Module in Redundant System
Standby system
Tracking cable
CPU module
Standby system
Tracking cable
Replace after turning OFF
the standby system power.
8.3.1 CPU Module Replacement
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