Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 343

Troubleshooting
Serial commu- Indicator
nications status
mode
Serial commu- The RD@ and
nications mode COM@ indica-
is set to Host tors are flash-
Link. ing, but the
response has
not been
returned from
the host.
For the Unit, the
SD@ indicator
does not flash
at all. (Commu-
nications have
been electri-
cally estab-
lished.)
314
Status CIO Area
information,
etc.
There is no ---
transmission
error.
CTS control is ON
and bit 04 of CIO
Area words n + 7/n
+ 17 (CTS signal) is
OFF.
There is a In CIO Area words n
transmission + 8/n + 18, bit 15
error. (transmission error
status) is turned
ON, and bit 04
(overrun error), bit
03 (framing error),
or bit 02 (parity
error) is turned ON.
Cause
This is a transmis- Conduct a loopback test in
sion circuit hard- serial communications
ware error. mode to check the trans-
mission lines. If an error
occurs during the test,
replace the Board or Unit.
The following set- Reset the frame parame-
tings in the FA com- ters correctly.
mand frame are
incorrect.
The ICF is set to
have no response.
The value of the
remote destination
address (DNA, DA1,
DA2) has not been
properly set.
The send delay time Reset the parameters in
setting is too long. the System Setup cor-
rectly.
The CTS control is Perform one of the follow-
set, but the RTS sig- ing:
nal from the remote
Wire the local Unit RTS
Unit has not entered
signal to the CTS signal
in the CTS signal of
using loopback.
the local Unit.
Disable the CTS control.
Enter the RTS signal of the
remote Unit into the CTS
signal of the local Unit, and
then use CTS control.
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.
There is noise inter- Use shielded twisted-pair
ference. cables.
Lay power lines sepa-
rately using ducts.
Review the installation
environment to reduce
noise interference.
Section 11-3
Remedy