SMC Networks EX600-SEC Series Operation Manual page 38

No. Problem
14 Abnormal valve operation
Presumed cause
The number of connected
valves is larger than the
number of occupied valve
outputs.
Abnormality with program,
etc.
Abnormal power supply
for output.
Connection between SI
unit and manifold valve is
defective.
Polarity of output does not
match.
SI unit has failed.
Valve failure.
-37-
Troubleshooting
When the number of occupied valves of the V_SEL
switch is smaller than the number of connected valves,
set the switch so that the number of occupied valves is
not smaller than the number of valves to be used.
Check if the ladder program of master, etc. is correct.
Check if the green PWR(V) LED of the SI unit is ON. If
the LED is off, or the red LED is ON, supply 24 VDC
+10/-5% to the power supply for output.
Check the connectors between the SI unit and manifold
valve are not damaged, such as bent pins, and connect
them correctly.
IF the polarity of the SI unit and the valve are different,
replace one of them to make the combination match.
•EX600-SEC1 (PNP output)
⇒ -common type valve
•EX600-SEC2 (NPN output)
⇒ +common type valve
Replace the SI unit with a normal one, and check the
operation.
Replace the valve with a normal one, and check the
operation. Or refer to the troubleshooting of the valve
used.
No.EX##-OMO0027