Omron CPM2A - 11-2005 Manual page 155

Troubleshooting Flowcharts
Are the IR 00002
and IR 00003 input indi-
cators operating
A
normally?
From
Yes
previous
page
Check the voltage at
the IR 00002 and
IR 00003 terminals.
Operation OK?
Yes
Check operation by using a
dummy input signal to turn the
input ON and OFF.
No
Replace the CPU Unit,
Expansion Unit, or
Expansion I/O Unit.
138
No No No
Check the voltage at
the IR 00002 and
IR 00003 terminals.
No
Yes
No
Wire correctly.
Operation OK?
Yes
Check input devices
LS1 and LS2.
Operation OK?
Yes
No
Is input wiring
correct?
No
Tighten the terminal
screws
Return to "start."
Section 5-5
Are the terminal
screws loose?
Yes
No
Replace the CPU Unit,
Expansion Unit, or
Expansion I/O Unit.