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-28-
No.EX##-OMO0004-A
Reference
No.
Problem
Possible cause
Investigation method
Countermeasure
Solenoid valve
failure
Check the operation by replacing the
solenoid valve.
Or refer to Troubleshooting for the
solenoid valve.
Check the
Troubleshooting for the
solenoid valve.
Or contact to the
department in charge of
the solenoid valve
Connection
between SI unit
and valve
manifold is
defective
Check that there is no contact failure
such as bending of the connector pins
between the SI unit and valve
manifold.
Connect the SI unit and
valve manifold properly.
The solenoid
valve does not
work
Check the total number solenoid
valves connected to the manifold does
not exceed the max. number of
outputs of the SI unit.
The number of solenoid
valve outputs that can be
connected to the
manifold has to be
smaller or equal to the
max. number of outputs.
EX180-SDN3
□
,
EX180-SDN5
□
: Max. 32 outputs
EX180-SDN4
□
,
EX180-SDN6
□
: Max. 16 outputs
7
Solenoid valve
malfunction
Solenoid valve
output is being
held
Check the HOLD/CLR setting of the SI
unit
Set HOLD/CLR setting
correctly.
∗
: When MNS LED red is ON, the SI unit is not automatically recovered even if the cause is eliminated.
Supply the power supply for DeviceNet
TM
of SI unit again.