Protocol Macros - Omron CJ1W-SCU32 Operation Manual

Error conditions
Serial Indicator
communica- display
tions mode
Serial com- The
munications SD@/RD@
mode is set to indicators
protocol flash, but the
macro. Unit cannot
perform com-
munications
or a communi-
cations error
sometimes
occurs.
The RDY and
ERC indica-
tors flash
(ERR/ALM).
The RDY indi-
cator is lit and
the ERC indi-
cator flashes
(ERR/ALM).
Note 1 The System Settings can not be changed unless the power supply is cycled, the Unit is restarted, or the
port is restarted. Refer to 1-8 Basic Operating Procedure for details.
2 For details on the protocol macros, refer to the CX-Protocol Ver.1.9 OPERATION MANUAL (Cat. No.
W344).
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
Status Confirmation of
information, etc. device variable for
CJ-series Unit, etc.
A transmission The contents of
error occurs. *_P1(orP2)_SysSetSta
(System Settings) do
not match those of the
Remote Unit.
Data is received ---
through CX-Pro-
tocol transmission
line trace, but the

protocol macros

behave as if no
data is received.
The Remote Unit ---
sometimes
returns no
response to sent
data. The Unit
receives
responses by per-
forming retries.
A transmission • *_P1(orP2)_TransErr
error sometimes (Transmission error)
occurs. is set to TRUE.
• The error for any of
bits 0 to 14 is set to
TRUE.
--- *_Com_UnitPmrDatErr
(Protocol Data Error) is
set to TRUE.
--- Bits 00 to 03 (Protocol
macro error code) of
*_P1(orP2)_PmrSta
are set to a value other
than 0 hex. (An error
occurred)
9 Troubleshooting and Maintenance
Cause
The Setup Area settings Review the Setup Area set-
such as the baud rate and tings.
frame format differ from
Review the Remote Unit
those of the Remote Unit.
settings and the program
The baud rate is outside the
(including the baud rate,
allowable range, or there
frame format, and so on).
are bit errors due to mis-
matched stop bits and so
on.
Because response from the Use full-duplex mode.
Remote Unit in half-duplex
mode is received too fast,
the data received from the
time the data send process-
ing was completed until the
Send operation was com-
pleted is discarded.
The transmission timing is Set or increase the trans-
too fast for the Remote Unit mission wait time (time to
to receive data. await data transmission) in
step units.
The wiring is faulty. • Check the wiring.
• Set the terminating resis-
The RS-422A/485 port ter-
minating resistance setting
is incorrect.
Adapters such as the NT-
AL001 are incorrectly wired,
or the terminating resis-
tance setting is incorrect.
A communications error fre- Use shielded twisted pair
quently occurs due to noise cables.
and so on.
House the communications
cables in a different duct
from those for power lines
and so on.
Review the operating envi-
ronment to prevent noise
problems.
Program retry processing
for communications if nec-
essary.
The protocol macro data Use CX-Protocol to transfer
SUM value is abnormal. the correct protocol data.
An error was detected in the Refer to Remedy for Each
protocol macros, which ErrorIDEx Code.
makes operation impossi-
ble.
Remedy
tance switch of the Unit
and remote unit at the end
to ON. Set the terminating
resistance of other units to
OFF.
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