Table of Contents
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No.
Problem
Possible causes
Communication
failure
Communication
line short
circuited
PWR LED is
ON
COMM LED
Breakage of
4
is OFF
communication
ERR LED is
line
OFF
Communication
cable wiring
failure
Communication
mode setting
failure
Investigation method
Check that there is no equipment or
high voltage cables which generates
noise around the communication and
power supply cables.
Check that the communication BDH and
BDL are no short circuited.
Check the cable for the communication
is not broken, and confirm that the
connection between the communication
cable and the terminal is not loose.
Confirm that repeated bending stress or
pulling force is not applied to the cable.
Check that the communication cable
BDH and BDL are wired correctly.
Confirm that the communication mode
setting of the master unit is not set to
Long-distance Communications Mode.
-26-
Countermeasure
Separate the communication
line away from noise sources.
Wire correctly.
Connect the communication
cable correctly.
Wire correctly.
Set the communication mode
to High-speed Communications
Mode.
No.EX※※-OMC0002-C
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