Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 351

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