Safety Instructions

Troubleshooting
When problems occur, take appropriate countermeasures while referring to the LED indication,
troubleshooting and parameter settings.
If a cause applicable to the failure cannot be identified, this indicates that the equipment itself is broken.
The fieldbus system damage can be caused by the operating environment. Contact SMC to obtain
countermeasures.
- LED indication for remote input / output unit / Troubleshooting
LED Details Problem No.
- All LEDs are OFF. - See problem No. 1.
PWR PWR(V) LED does not turn on green. Red LED flashes. See problem No. 2.
MS MS LED does not turn on green.
Red LED flashes.
See problem No. 3. Red LED is ON
OFF
W-SS Red W-SS LED flashes or is OFF.
Red LED flashes.
See problem No. 4.
OFF
W-NS W-NS LED does not turn on green.
Green LED flashes
See problem No. 5.
Red LED flashes.
Red LED is ON
Orange LED is ON
Red and green LEDs are ON
alternately.
OFF
Digital input /output device does not operate correctly. See problem No. 6.
Problems related to the NFC See problem No. 7.