SMC Networks EX120-SDN1-X2 Operation Manual page 34

Fault No. 5
Problem Possible cause
Incorrect wiring of
the power supply
for DeviceNet
SI unit
communication
MOD/NET LED
flashes Green
I/O connection
stand-by (off-line
status)
Fault No. 6
Problem Possible cause
The total number
The solenoid
of solenoid valve
valves after
outputs connected
output 17 do
has exceeded the
not operate
max. allowed
Fault No. 7
Problem Possible cause
Poor connection
between SI unit
and valve manifold
Solenoid
valves do not
operate
correctly,
Polarity of the
solenoid valve
solenoid valve and
LED is OFF
the SI unit output
are not compatible
Solenoid valve
failure
Fault No. 8
Problem Possible cause
Solenoid
valves do not
operate Solenoid valve
correctly, failure
solenoid valve
LED is ON.
Investigation method
Check the DeviceNet
TM
check for broken wires.
If the network is using a scan list, check that the
slave is registered correctly into the scan list.
Investigation method
Check that the total number of outputs
connected to the SI unit is 16 or less.
Investigation method
Check if there are any loose screws making
the connection between the SI unit and the
Valve manifold.
Check that the solenoid valve polarity
specification and output polarity of the SI unit
are compatible.
Refer to the troubleshooting of the solenoid
valve.
Investigation method
Refer to the troubleshooting of the solenoid
valve.
-33-
TM
cable connections and
Countermeasures
TM
Re-wire the DeviceNet
cable. (Replace the cable if it
is damaged).
Rectify the wiring of the
TM
DeviceNet cable.
Correct the setting of the
scan list.
Countermeasures
Make corrections so that the
total number of outputs is 16
or less.
Note when single solenoid
valves are mounted onto a
double wiring specified
manifold.
Countermeasures
Tighten the screws while
holding the SI unit and the
solenoid valve manifold so
that there is no gap between
them. Tighten the screws to
the specified tightening
torque.
Use a solenoid valve polarity
compatible with the output
polarity of the SI unit.
Refer to the troubleshooting
of the solenoid valve.
Countermeasures
Refer to the troubleshooting
of the solenoid valve.
No.EX##-OME0015-C