Chapter 14 Troubleshooting
14-
6
Continued
Is SWITCH 1, 2 LED
ON ?
No
Measure the terminal
voltage of SWITCH 1, 2
by the tester.
Yes
Is the measured
value normal ?
After removing the
external wiring,
check the input state
by forced input.
Is the measured
value normal ?
Check the input
device
(SWITCH 1, 2) state.
Change the input
module.
Measure the terminal
voltage of SWITCH 1, 2
by the tester.
Is the
measured value
normal ?
Is the
tightening state of
terminal good ?
Is input
wiring correct ?
Make the correct
wiring.
Tighten the terminal
screw completely.
Change the
terminal block
connector.
Change the input
module.
Check all from the
beginning again.
Is the
contact state of terminal
block connector
good ?
Yes
No
No
Yes
No
Yes
Yes
No
Yes
No
No