Cpu Unit Replacement Procedure - Omron CS1D DUPLEX SYSTEM - 10-2009 Operation Manual

Replacing a CPU Unit

11-3-2 CPU Unit Replacement Procedure

1,2,3...
!Caution You must set the USE/NO USE switch on the Duplex Unit to NO USE before
1. Change the USE/NO USE switch for the CPU Unit to be replaced to NO
USE. When the switch is changed to NO USE, the power supply to the
CPU Unit will turn OFF.
2. Confirm that the indicators on the CPU Unit to be replaced have all gone
out.
replacing a CPU Unit to turn OFF the power supply to the CPU Unit. If a CPU
Unit is replaced while power is still being provided (i.e., with the switch set to
USE), the CPU Backplane for Duplex CPU System or Duplex Unit may be
damaged.
Example: The following illustration shows the switch setting when the right
CPU Unit has failed and the left CPU Unit has taken over operation in Sim-
plex Mode.
Duplex Unit
Operating Failed
3. Replace the faulty CPU Unit with a new CPU Unit.
Duplex Unit
Operating
Failed CPU Unit
C S C S
R U N R U N
ER R/ ALM ER ALM
I N I N H BKUP
PR PH PR PH C O M
C O M M
4. Confirm the following for the new CPU Unit.
• That it has the same model number as the previous CPU Unit
• If an Inner Board is being used, that the new Inner Board has the same
model number as the previous Inner Board.
Switch for right-side CPU Unit
on the Duplex Unit
R I G H T C P U
U S E
N O U S E
Confirm that all indicators on the
right-side CPU Unit are OFF.
New CPU Unit
C S C S
R U N R U N
ER R/ALM ER R/ALM
I N I N H BKUP
P R P P R P H CO M M
O M M
Section 11-3
Set to NO USE.
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