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No.EX##-OML0007
Troubleshooting table
Fault
no.
LED status
Fault
Check
Action
(Diagnostics active)
When red light is flashing fault is
either of the following:
Input device ON/OFF count has
exceeded the set value.
Input device not connected (for
open circuit detection type only).
Check cause by PLC or HT
Check if there is a loose connector
or wire break.
For details refer to system
diagnostics data.
Reset the counter, change the
settings or disable the
diagnostics through parameter
settings.
Confirm if the correct sensor has
been used and all cables and
sensors are connected correctly.
(Diagnostics active)
When both adjacent LEDs are ON
fault is, without open circuit
detection.
Short circuit in power supply of
either input device “0”or “1”.
Check which input device has
caused the short circuit.
Correct wiring and confirm input
unit and cables are connected
correctly.
(Diagnostics active)
When only one LED is ON fault is,
with open circuit detection.
Short circuit in power supply of
input device "0".
–
Correct wiring and confirm input
unit and cables are connected
correctly.
1
When all LEDs are flashing
red/green alternately fault is,
component failure inside the digital
input unit.
–
Stop using the product and contact
SMC.
(Diagnostics active)
When red light is flashing fault is,
either of the following:
Output device contact
operations count has exceeded
the set value.
Output device is not connected.
Check cause by PLC or HT
Check if there is a loose connector
or wire break.
For details refer to system
diagnostics data.
Reset the counter, change the
settings or disable the
diagnostics through parameter
settings.
Confirm if the correct sensor has
been used and confirm output
unit and cables are connected
correctly.
(Diagnostics active)
When red light is ON fault is,
output is short circuited.
Check the wiring.
Correct wiring and confirm output
unit and cables are connected
correctly.
2
When all LEDs are flashing
red/green alternately fault is,
component failure inside the digital
output unit.
–
Stop using the product and contact
SMC.
(Diagnostics active)
When red light is flashing fault is,
upper or lower limit is detected for
either of the following items:
Range
Measurement value (User
setting)
Check if the sensor output
exceeds the upper/lower range.
Check if the sensor output
exceeds the user set
upper/lower measurement
value.
Adjust sensor output within
measurement range or adjust
setting range or turn off
over/under range detection.
Adjust sensor output within user
set value or adjust user set value
or turn off user set value
upper/lower limit detection.
(Diagnostics active)
When red light is ON fault is, power
supply for input device is short
circuited.
Check for short circuit at the sensor
or cable.
Correct wiring and confirm input
unit and cables are connected
correctly.
3
When all LEDs are flashing
red/green alternately fault is,
component failure inside the
analog input unit.
–
Stop using the product and contact
SMC.
