-21-
No.EX
※※
-OMU1012
Fault No.5
Problem
Possible cause
Investigation method
Countermeasures
SI unit
D LINK LED
turned OFF
Out of node number
setting range
Check if the node number is outside of the
node number setting range.
Set the node number within
the setting range.
Node number
setting duplication
Check if the node number is duplicated.
Set the node number so that it
is not duplicated.
Construction of the
PLC program and
the connected
model is different.
Check that the program construction of the
PLC and the connected model is the same.
Align the model setting to the
PLC program construction.
Node number not
assigned
The node numbers assigned to the SI units
are not registered in the PLC program.
Assign the SI unit node
numbers to the PLC unit or
connect the SI unit which is
assigned in the PLC.
Fault No.6
Problem
Possible cause
Investigation method
Countermeasures
Only the
output of the
low-order bit is
not operating.
No. of solenoids has
exceeded the
allowable number
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
Change the number of
solenoids to within the
specification.
Fault No.7
Problem
Possible cause
Investigation method
Countermeasures
Solenoid
valves do not
operate
correctly,
solenoid valve
LED is OFF
Defective
connection between
the SI unit and
solenoid valve
manifold
Check that the screws which connect the SI
unit and the solenoid valve are not loose.
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)
Polarity of the
solenoid valve and
the SI unit output are
not compatible
Check that the solenoid valve polarity
specification and output polarity of the SI
unit are compatible.
Use a solenoid valve polarity
compatible with the output
polarity of the SI unit.
Solenoid valve
failure
Refer to the troubleshooting of the solenoid
valve.
Refer to the troubleshooting of
the solenoid valve.
Fault No.8
Problem
Possible cause
Investigation method
Countermeasures
Solenoid
valves do not
operate
correctly,
solenoid valve
LED is ON
Polarity of the
solenoid valve and
the SI unit output are
not compatible
Check that the solenoid valve polarity
specification and output polarity of the SI
unit are compatible.
Use a solenoid valve polarity
compatible with the output
polarity of the SI unit.
Summary of Contents for EX250-SCF1-X200
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