-25-
No.EX##-OMM0008-B
Trouble
No.
Problem
Possible cause
Investigation method
Countermeasure
Check the master unit is operating
properly.
7
SI unit
MS_LED green on
NS_LED green
blinking
Connecting
Check the I/O area of the slave unit is
not over the area permitted by the
master unit.
Refer to the Operation
Manual of the master unit.
Incorrect wiring
of valve power
supply
Check the valve power supply cable is
not opened, and that there are no loose
connections between the power supply
cable and terminal.
Check there is no repeated bending
and pulling force applied to the cable,
which will cause breakage.
Connect the valve power
supply cable correctly.
Check there is no incorrect wiring of
valve power supply.
Correct the wiring.
8
SI unit
MS_LED green on
NS_LED green on
PWR(V)_LED goes
off
Valve power
supply failure
Check proper supply voltage of valve
power supply.
Supply 24 VDC -5%
+10% to valve
communication power
supply.
Valve failure
Check the operation with another valve.
Check the
troubleshooting for a
valve.
Connection
failure between
SI unit and
manifold.
Check the connector between SI unit
and manifold for the connection failure
such as a bent pin
Correct the connection
between SI unit and
manifold.
9
Valve malfunction
Valves over a
total of 16
outputs will not
operate.
Check the total number of outputs of the
valves connected to the manifold is 16
or less.
The max. number of
outputs of the product is
16. Be sure to keep the
number of outputs 16 or
less.
