SMC Networks EX140-SMJ1 Series Operation Manual page 16

○Faults and countermeasures
Trouble
Problem
No.
SI unit PWR
1
LED is OFF
SI unit PWR
LED is ON
2
and
RD LED is OFF
SI unit L RUN
LED is OFF
3
and
L ERR.LED is OFF
SI unit L RUN
LED is OFF
4
and
L ERR.LED is ON
Possible cause
Check the SI unit control power
supply cables for breaks, and check
SI unit control
that the terminals are not loose.
power supply
Avoid repetitive bending and stress
wiring failure
on the cables, which may cause
damage.
Check the SI unit control power
SI unit control
supply wiring for any errors.
power supply
Check the SI unit control power
failure
supply voltage.
Check the communication cables for
breaks, and check that the terminals
are not loose.
Avoid repetitive bending and stress
Communication
on the cables, which may cause
wiring failure
damage.
Check the communication wiring for
any errors.
Master station
Check the power supply to the
power supply
master station.
failure
Check that there are no high voltage
Communication cables or equipment that generates
failure noise around the communication and
power supply cables.
Check that the SI unit station number
Station number
setting and the setting in the master
setting error
station are the same.
Communication Check that the SI unit communication
speed setting speed setting and the setting in the
error master station are the same.
Station number
Check that the station number
setting error or
settings contain no errors and no
duplicate station
duplications.
number error
Communication
Check that the communication speed
speed setting
is set correctly.
error.
-15-
Investigation method Countermeasure
Connect the power supply
cable correctly.
Correct the wiring.
Supply 15 to 30 VDC to
the SI unit control.
Connect the
communication cable
correctly.
Correct the wiring.
Connect the power supply
to the master station
correctly.
Separate the
communication and power
supply cables from the
noise sources.
Correct the setting.
Correct the setting.
To review the setting
method, see "Settings".
No.EX##-OME0011-G