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6. TROUBLESHOOTING
6.2.3 Master module RD/SD LED off
Both RD
and SO LEOs
off?
YES
NO
Only the master module RD
LED
off
Make data communica-
tion
with
the data link
cable
connected
be-
tween the master station
SO ISOA, SOB) and RO
IROA. ROB).
Master
station mode setting
switch in online
mode?
Y18
on?
xt
on?
NO
NO
Set the
mode setting
switch to any of 0 to 2
(online mode).
Reset the PC CPU.
Consult the sales repre-
sentative with details.
•
Read the communication
error code (address 107).
•
Line error
Make line check and re-
pair the fault in accord-
ance with Section 4.6.1.
Initial code error
Invalid value has been
set to the number of re-
mote
I/O
stations
(address 0), the number
of retries (address 1I, etc.
YES
YES
Error code 27
Error code 1?
A faulty station has been
detected with the mode
setting switch set to 2.
I
Read the faulty station
detection code (addres-
ses
100
to
103)
to check
which station is faulty.
Data link cable is faulty
or noise has affected the
faulty station. Check the
cables and examine the
installation environment
and ground method.
6-5
18 (NAl66164-A
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Table of Contents
Troubleshooting
