SMC Networks EX250-SCF1-X200 Operation Manual page 22

Fault No.5
Problem Possible cause
Out of node number
setting range
Node number
setting duplication
Construction of the
SI unit
PLC program and
D LINK LED
the connected
turned OFF
model is different.
Node number not
assigned
Fault No.6
Problem Possible cause
Only the
No. of solenoids has
output of the
exceeded the
low-order bit is
allowable number
not operating.
Fault No.7
Problem Possible cause
Defective
connection between
the SI unit and
solenoid valve
Solenoid
manifold
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 Polarity of the
operate solenoid valve and
correctly, the SI unit output are
solenoid valve not compatible
LED is ON
Investigation method
Check if the node number is outside of the
node number setting range.
Check if the node number is duplicated.
Check that the program construction of the
PLC and the connected model is the same.
The node numbers assigned to the SI units
are not registered in the PLC program.
Investigation method
Check that the number of solenoids has not
exceeded the allowable number.
The allowable number depends on the SI
unit model and solenoid valve series.
Number of solenoids that can be mounted:
SY/SV/SO700 series: 32 points
VQC series: 24 points
Investigation method
Check that the screws which connect the SI
unit and the solenoid valve are not loose.
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
Check that the solenoid valve polarity
specification and output polarity of the SI
unit are compatible.
-21-
Countermeasures
Set the node number within
the setting range.
Set the node number so that it
is not duplicated.
Align the model setting to the
PLC program construction.
Assign the SI unit node
numbers to the PLC unit or
connect the SI unit which is
assigned in the PLC.
Countermeasures
Change the number of
solenoids to within the
specification.
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 torque.
(Tighten the screws: 0.6 Nm)
Use a solenoid valve polarity
compatible with the output
polarity of the SI unit.
Refer to the troubleshooting of
the solenoid valve.
Countermeasures
Use a solenoid valve polarity
compatible with the output
polarity of the SI unit.
No.EX※※-OMU1012