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Chapter 11 Troubleshooting
11-6
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A
re the indicator LED of the
switch 1 and 2 on?
No
Check the status of the switch
1and 2
Yes
Is input wiring correct?
Separate the external wiring witch then
check the status by forced input
Correct the wiring
Check the status of the switch
1 and 2
Unit replacement is
needed
Check the status of the switch
1and 2
Is input wiring correct?
Is the
terminal screw tighten
securely?
Is input wiring correct?
Correct wiring
Retighten the terminal
screw
Replace the terminal
board connector
Unit replacement is
needed
Check from the beginning
Is the condition
of the terminal board connector
appropriate?
Yes
No
Yes
No
Yes
Yes
No
Yes
No