Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 342

Troubleshooting
Serial commu- Indicator
nications status
mode
Serial commu- The SD@/RD@
nications mode and COM@
is set to Host indicators do
Link. not flash at all.
(Communica-
tions have not
been electri-
cally estab-
lished.)
The RD@ and
COM@ indica-
tors are flash-
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.)
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.
CIO Area words n +
5/n + 15 (port set-
tings in the System
Setup) do not corre-
spond to the set-
tings of the remote
device.
---
Cause
Cables are incor- Check the wiring.
rectly connected.
The RS-422A/485 Reset the port to the cor-
port setting (2-wire rect wiring setting.
or 4-wire) is incor-
Wire all nodes using the 4-
rect.
wire method.
Adapters such as
the NT-AL001-E are
incorrectly wired or
set.
Commands are not Reset the serial port at the
being set from the host, and rewrite the pro-
host. gram.
This is a hardware Set bits 08 to 11 (Serial
error. Communications Mode) of
DM Area words m/m + 10
to F Hex (Loopback Test
Serial Communications
Mode). Then, connect the
connector wire for a loop-
back test and conduct a
loopback test by turning
ON bit 14 (Loopback Test
Switch) of CIO Area word
n. The test data is
reflected in CIO Area
words n+9/n+19. If an
error occurs during the
test, replace the Board or
Unit.
The System Setup Reset the settings in DM
in DM Area words m Area words m + 2 and m +
+ 2 and m + 3/m + 3/m + 12 and m + 13 of the
12 and m + 13 of Board or Unit (Host Link
the Board or Unit Unit No., Host Link send
(Host Link Unit No., delay time, etc.) so that
Host Link send they correspond to the set-
delay time, etc.) tings at the host device.
does not corre-
Correct the command
spond to the set-
frame (header, Host Link
tings for the remote
Unit No., terminator, etc.)
device.
and the program.
The command for-
mat and data length
of the data sent
from the host are
incorrect.
Cables are incor- Check the wiring.
rectly connected.
The RS-422A/485 Reset the port to the cor-
port setting (2-wire rect wiring setting.
or 4-wire) is incor-
Wire all nodes using the 4-
rect.
wire method.
Adapters such as
the NT-AL001-E are
incorrectly wired or
set.
Section 11-3
Remedy
313