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Chapter 6
Error indication and Countermeasure
(4) CERR LED of slave module lights. (transmission time-out error)
Setting of switches of master
I/O assignment and I/O numbers
Please exchange the remote module.
CERR LED of master
module lights.
LED continues on after 30
seconds.
Y
and slave is correct.
Y
in program is correct.
Y
Power supply of master is
turning on.
Y
It happened many
times.
Y
Connection of cables
is correct.
Y
Setting of termination
is correct.
Y
Shielded twisted pair
cable is recommended
cable.
Y
N
But communication error (CERR) of slave
module lights while master can't start
communication after initial processing.
Refer to Section 5.4 for detail.
N
Set rotary switch and DIP switch of master
and slave correctly.
Refer to Chapter 3 for details.
N
Set I/O assignment and I/O numbers in
program correctly.
N
Turn on the power supply of master
station.
N
It is thought the temporary one by the
noise. Please investigate, and confirm the
noise source.
N
Please connect the cable correctly.
N
Set DIP switch in order to insert correct
value of resister for terminator in both
ends of master or slave modules connected
in transmission line.
N
Use recommended cable for shielded
twisted pair cable. Refer to Table 2.2 for
recommended cables.
6 – 8
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