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No.EX##-OML0007
Fault
no.
LED status
Fault
Check
Action
When all LEDs are OFF fault is,
power for control/input is OFF.
Check if power supply for
control/input is connected.
Re-connect power supply for
control/input
When ST(M) LED is red fault is,
component failure inside SI unit.
–
Stop using the product and
contact SMC.
(Diagnostics
active)
When ST(M) LED is flashing red
fault is either,
Valve is in short circuit or open
circuit i.e. valve is broken.
Valve ON/OFF counter has
exceeded the set value.
Check cause by PLC or HT
For details refer to system
diagnostics data.
Replace valve if broken and
confirm operation.
Reset counter value, change
set value or disable the
diagnostics through parameter
setting.
When ST(M) LED is flashing
red/green fault is,
communication error between SI
and I/O units.
Check for a loose connection
between units.
Confirm all equipment and
cables are connected correctly.
If the error does not recover;
stop using the product and
contact SMC.
(Diagnostics
active)
When PWR LED is red fault is,
abnormal power voltage for
control/input.
Check the power supply.
Adjust or replace power supply.
(Diagnostics
active)
When PWR(V) LED is red fault
is, abnormal power voltage for
output.
Check the power supply.
Adjust or replace power supply.
When MS is green and NS is
OFF fault is, communication
error.
Check for node address
duplication.
Check communication speed
used by PLC and slave are the
same
Set the correct address/speed.
When MS is green and NS is
flashing green fault is device is
online, but connection cannot be
established.
Check the following:
PLC is operating normally
If a scan list is used on the
network, check that the slave
is correctly registered on the
scan list.
Operate PLC correctly. (For
details, refer to the PLC’s
manual)
Perform scan list registration
correctly.
When MS is red and NS is OFF
fault is, component failure inside
SI unit.
–
Stop using the product and
contact SMC.
When MS is green and NS is red
fault is a critical DeviceNet
TM
communication error
Check:
Is the node address set
correctly?
Is the communication speed of
the PLC and the slave unit the
same?
Is the cable length within
specification?
Is the wiring including cables
and connections, correct?
Have the correct terminators
been used?
Is communication protected
from noise?
Change as necessary the items
below, then restart.
Node address
Communication speed
Cable length
Wiring including cables and
connections
Terminators
Noise protection
4
When MS is green and NS is
flashing red fault is a non-critical
DeviceNet
TM
communication
error
Check:
Is the communication speed of
the PLC and the slave unit the
same?
Is the cable length within
specification?
Is the wiring including cables
and connections, correct?
Have the correct terminators
been used?
Is communication protected
from noise?
Change as necessary the items
below, then restart.
Communication speed
Cable length
Wiring including cables and
connections
Terminators
Noise protection
