Omron SYSMAC CJ1W-SCU31-V1

322
Troubleshooting Section 11-3
The con-
verted
command
could be
sent to the
remote
device but
a normal
response is
not
received
from the
remote
device.
The serial
communica-
tions mode is
set to Serial
Gateway or
protocol
macro mode.
Either the
SD@/RD@
and COM@
indicators all
flash.
0205 hex
(response
timeout), etc.
Bit 05 of CIO
word n+8/
n+18 (Serial
Gateway Send
Start Time-
out/ Response
Timeout) is
ON.
The response
from the remote
device is too fast
and the data
received by the
Board/Unit has
been discarded.
Delay the response from
the remote device.
The SD@
and COM@
indicators
flash, but a
response is
not always
returned.
0205 hex
(response
timeout), etc.
Bit 02, 03, 04,
or 15 of CIO
word n+8/
n+18 (transfer
error, overrun
error, framing
error, or parity
error) is ON.
A hardware error
has occurred in
the reception cir-
cuit of the Board/
Unit.
Conduct a loopback test
in serial communications
mode to check the trans-
mission lines. If an error
occurs during the test,
replace the Board or
Unit.
The RD@/
SD@, and
COM@ indi-
cators all
flash, but a
response is
not always
returned.
A transmission
error has occurred
due to noise.
Use shielded twisted-
pair cables.
Lay power lines sepa-
rately using ducts.
Increase the number of
resends at the FINS
transmission source.
Perform communications
retry as required.
Error conditions Cause Remedy
Board/Unit
status
Serial com-
munications
mode
Indicator
display
FINS end
code sent to
FINS trans-
mission
source
Words allo-
cated in CIO
Area