Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 375

Troubleshooting
Serial commu- Indicator
nications status
mode
Serial commu- The RD@/SD@
nications mode and COM@
is set to Mod- indicators are
bus-RTU slave flashing, and an
mode. error response
has returned to
the host.
The RD@/SD@
and COM@
indicators are
flashing, but
sometimes
there is no
response
returned.
346
Status CIO Area
information,
etc.
There is no CIO Area words n +
transmission 8/n + 18 (transmis-
error. sion error status)
are set to 0000 Hex.
There is a In CIO Area words n
transmission + 8/n + 18, bit 15
error. (transmission error
status) is turned
ON, and bit 07(CRC
error), bit 04 (over-
run error), bit 03
(framing error), or
bit 02 (parity error)
is turned ON.
There is a In CIO Area words n
transmission + 8/n + 18, bit 15
error some- (transmission error
times. status) is turned
ON, and bit 07(CRC
error), bit 04 (over-
run error), bit 03
(framing error), or
bit 02 (parity error)
is turned ON.
There is a Terminating resis-
transmission tance switch (TERM
error some- ON/OFF) status
times.
There is a CIO Area words n +
transmission 8/n + 18 (transmis-
error some- sion error status)
times. are not set to 0000
Hex.
Cause
A command was Review the host's settings
sent from the host and program (such as
with incorrect parameter settings) based
parameters. on the response contents.
The communica- Review the System Setup,
tions conditions and the host's settings and pro-
baud rate do not gram (such as commands
match the settings and frame format) based
at the host. on the response contents,
and the transmission error
codes in CIO Area words n
+ 8/n + 18.
The baud rate is Review the System Setup.
outside the allow-
Review the host's settings
able range, and the
and program (such as
stop bits do not
baud rate and frame for-
match, causing the
mat).
bits to be out of
alignment.
Cables are incor- Check the wiring.
rectly connected.
The RS-422A/485
Turn ON the terminating
port terminating
resistance of the Board
resistance setting is
and the last node by using
incorrect.
the terminating resistance
Adapters such as switch. Turn OFF the ter-
the NT-AL001-E are minating resistance of
incorrectly wired or other nodes.
the terminating
resistance is incor-
rectly set.
Transmission errors Use shielded twisted-pair
are occurring that cables.
are caused by noise
Lay power lines sepa-
interference.
rately using ducts.
Review the installation
environment to reduce
noise interference.
Programming retry pro-
cessing for communica-
tions if necessary.
Section 11-3
Remedy