![background image](http://html1.mh-extra.com/html/smc-networks/ex120-sdn1-x2/ex120-sdn1-x2_operation-manual_1300551031.webp)
-30-
No.EX##-OME0015-C
Troubleshooting and maintenance
Troubleshooting flowchart
When any malfunction is observed, perform the following troubleshooting.
SI unit does not
operate normally
Solenoid valves not
operating correctly
SI unit MOD/NET LED
is OFF
The solenoid
valves after output
17 do not operate
Refer to fault
No.6
Refer to fault
No.7
SI unit MOD/NET LED
is flashing Green
SI unit MOD/NET LED
is ON Green
SI unit PWR LED
is OFF
SI unit MOD/NET LED
is ON Red
SI unit MOD/NET LED
is flashing Red
Check the status
of the solenoid valves
Refer to fault
No.8
Solenoid valves not
operating correctly, solenoid
valve LED is OFF
Solenoid valves not
operating correctly, solenoid
valve LED is ON
Yes
No
Refer to fault
No.5
Refer to fault
No.4
Refer to fault
No.3
Refer to fault
No.2
Refer to fault
No.1