Red ST(M) LED is
flashing.
(Diagnosis is activated)
(1)Valve is short-circuited.
(2)Valve is open-circuited.
(3)ON/OFF count of the
valve has exceeded
the set value.
Check the parts with error by using the LED display or
unit diagnostic data or master.
(1)Check the operation after replacing the valve.
(2)Check the operation after replacing the valve.
(3)Reset the ON/OFF count to zero or change the set
value. Or invalidate diagnosis.
Turn OFF the power for the unit and then turn it ON
again. If the error is not eliminated, stop the operation
and contact SMC.
Red/Green ST(M) LED is
flashing alternately.
Connection error between
units is detected.
Confirm that there is no loose connection between the
units and connect them correctly.
Red PWR LED is ON.
(Diagnosis is activated)
Power supply voltage for
control and input is out of
range.
Supply 24 VDC ±10% for control and input power
source.
Red PWR(V) LED is ON.
(Diagnosis is activated)
Power supply voltage for
output is out of range.
Supply 24 VDC +10/-5% for output power source.
L/A IN and L/A OUT LEDs
are OFF.
LINK has not yet been
established.
Check the following and restart.
(1)Check if the power is supplied to the EtherNet/IP
device one level above. (When L/A IN LED is OFF.)
(2)Check that the connectors of L/A IN and L/A OUT
communication cables are connected and there are
no broken wires.
(3)Keep noise sources away from the communication
cable.
: The L/A OUT LED will be OFF if the BUS OUT connector is
not used.
L/A IN or L/A OUT LED is
ON.
LINK is established but
data has not been
received.
Check the following and restart.
(1)Check the master condition and run the master.
(2)Check that the communication connector is not loose
and there are no broken wires.
(3)Keep noise sources away from the communication
cable.
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