Omron SYSMAC CPM1 Operation Manual page 114

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
O.K.?
Yes
Check operation by using a
dummy input signal to turn the
input ON and OFF.
No
Replace the CPU
Unit or Expansion
I/O Unit.
98
No No No
Check the voltage at
the IR 00002 and IR
00003 terminals.
No
Yes
No
Is input wiring
Wire correctly.
Operation
O.K.?
Yes
Return to "start."
Check input devices
LS1 and LS2.
Operation
O.K.?
Yes
No
correct?
No
Tighten the terminal
screws
Section 5-6
Are the terminal
screws loose?
Yes
No
Replace the CPU
Unit or Expansion
I/O Unit.