SMC Networks EX260 Series Operation Manual page 21

Troubleshooting table
Fault No.1
Fault Probable cause
Defective power
cable wiring for SI
SI unit
unit operation
PWR LED
is OFF
SI unit operating
voltage is not
supplied
Fault No.2
Fault Probable cause
Defective power
cable wiring for the
SI unit
solenoid valve
PWR (V) LED
is OFF
Load voltage for the
valve is not supplied
Fault No.3
Fault Probable cause
Incorrect network
length or terminating
resistor
Incorrect setting
change of the
L RUN L ERR
communication
LED is LED is
speed
OFF flashing
Incorrect setting
change of the station
number.
Communication
failure
Recommended error handling
Check the condition of the power cable
wiring to the SI unit.
Check the condition of the supply voltage to
the SI unit.
Recommended error handling
Check the condition of the power cable
wiring for the valve.
Check the condition of the supply voltage for
the valve.
Recommended error handling
Check the network length is acceptable for
the communication speed, check that the
terminating resistor is present at both ends,
and check that a suitable CC-Link cable has
been used.
Check that the communication speed setting
has not been changed whilst power was
supplied to the SI unit.
Check that the station number setting was
not changed whilst power was supplied to
the SI unit.
Check that there is no noise source or high
voltage lines around the communication or
power supply cables.
-20-
Recommended action
Re-tighten the power cable.
(Replace the cable if it is
broken)
Correct the power cable wiring
layout.
Supply 24 VDC 10% to the SI
unit.
Recommended action
Re-tighten the power cable.
(Replace the cable if it is
broken)
Correct the power cable wiring
layout.
Supply 24 VDC +10%/-5% to
the valves.
Recommended action
Wire and set correctly.
Turn off the power supply for
the SI unit. After setting
correctly supply power to the
SI unit.
Keep noise sources away from
the communication and power
supply cables.
No.EX※※-OMP0005-E