Omron CQM1H-SCB41 Operation Manual page 145

Troubleshooting
Serial Indicator
communi- display
cations
mode
Serial com- The
munica- COMM@
tions mode indicators
is set to are flash-
protocol ing, but the
macro. Serial Com-
(Continued) munica-
tions Board
cannot per-
form com-
munications
or a com-
munica-
tions error
sometimes
occurs.
Error
code
0 Hex
1 Hex
2 Hex
3 Hex
130
Status I/O memory
information,
etc.
A transmission The error code in
error some- IR 20100 to
times occurs. IR 20103 for port 1
or IR 20108 to
IR 20111 for port 2 is
not 0.
Note The following table shows the measures to correct error codes provided in
IR 20408 to IR 20411 for port 1 and IR 20412 to IR 20415 for port 2.
Indicator Error details
No display Normal
No display The PC Setup
settings (DM
6550 to DM
6559) for the
Serial Commu-
nications Board
Protocol
are in
Macro Mode.
No display Sequence num-
ber error
ERR/ALM: Receive data
Flashing write range
overflow error
Cause
The wiring is faulty.
The RS-422A/485 port
terminating resistance
setting is incorrect.
Adapters such as the NT-
AL001-E are incorrectly
wired, or the terminating
resistance setting is
incorrect.
A communications error
frequently occurs due to
noise and so on.
Cause
--- ---
--- Review the The PC Setup settings for the
Serial Communications Board in the rele-
vant port.
The communica- Correct the communications sequence
tions sequence number.
number specified in
Use CX-Protocol to register the specified
bits 00 to 11 of the
communications sequence number.
PMCR( ) instruc-
tion's C operand is
not registered.
The data range of For operand specification:
the specified area is Check the PMCR( ) instruction S and D
exceeded when operand specifications.
data is being written
For direct specification of link words:
to or read from the I/
Use CX-Protocol to check the specified
O memory of the
range.
CPU Unit.
Section 9-2
Remedy
Check the wiring.
Turn ON the terminating
resistance of the Serial
Communications Board
and the last node by
using the terminating
resistance switch. Turn
OFF the terminating
resistance of other
nodes.
Use shielded twisted pair
cables.
House the communica-
tions cables in a different
duct from those for power
lines and so on.
Review the operating
environment to prevent
noise problems.
Remedy