-20-
No.EX##-OMK0004-A
Troubleshooting
Troubleshooting flow chart
If the SI unit malfunctions, select the specific trouble with the flow chart stated below.
A reduced wiring
system does not
operate normally
Only the solenoid
valve LED lights up
Refer to
trouble No.1
The outputs
that are beyond
the maximum point
number do not
operate
Only the solenoid
valve/output block
LEDs do not light
up
Ask to SMC
Yes
No
A solenoids valve
does not operate
normally
The input block
does not operate
normally
The inputs
that are beyond
the maximum point
number do not
operate
The Input block
PWR_LED goes off
Only the input
signal LED of the
Input block do not
lights up
Refer to
trouble No.2
Refer to
trouble No.3
Refer to
trouble No.4
Refer to
trouble No.5
Refer to
trouble No.6
The SI unit
PWR_LED goes off
Refer to
trouble No.7
The SI unit
SOL_LED goes off
Refer to
trouble No.8
The SI unit
MS_LED goes off
Refer to
trouble No.9
The red SI unit
MS_LED flashes
Refer to
trouble No.11
The green SI unit
MS_LED flashes
Refer to
trouble No.12
The red SI unit
MS_LED lights up
Refer to
trouble No.10
The SI unit
NS_LED goes off
Refer to
trouble No.13
The red SI unit
NS_LED lights up
Refer to
trouble No.14
The red SI unit
NS_LED flashes
Refer to
trouble No.15
The green SI unit
NS_LED flashes
Refer to
trouble No.16