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9-19
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-3 T
rou
b
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o
ting
9
9-3-3 Proto
c
ol Macros
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).
Error conditions Cause Remedy
Serial
communica-
tions mode
Indicator
display
Status
information, etc.
Confirmation of
device variable for
CJ-series Unit, etc.
Serial com-
munications
mode is set to
protocol
macro. The
SD
@ /RD @
indicators
flash, but the
Unit cannot
perform com-
munications
or a communi-
cations error
sometimes
occurs.
A transmission
error occurs. The contents of
*_P1(orP2)_SysSetSta
(System Settings) do
not match those of the
Remote Unit. The Setup Area settings
such as the baud rate and
frame format differ from
those of the Remote Unit.
The baud rate is outside the
allowable range, or there
are bit errors due to mis-
matched stop bits and so
on. Review the Setup Area set-
tings.
Review the Remote Unit
settings and the program
(including the baud rate,
frame format, and so on).
Data is received
through CX-Pro-
tocol transmission
line trace, but the
protocol macros
behave as if no
data is received. --- Because response from the
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. Use full-duplex mode.
The Remote Unit
sometimes
returns no
response to sent
data. The Unit
receives
responses by per-
forming retries. --- The transmission timing is
too fast for the Remote Unit
to receive data. Set or increase the trans-
mission wait time (time to
await data transmission) in
step units.
A transmission
error sometimes
occurs. • *_P1(orP2)_TransErr
(Transmission error)
is set to TRUE.
• The error for any of
bits 0 to 14 is set to
TRUE.
The wiring is faulty.
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.
• Check the wiring.
• Set the terminating resis-
tance switch of the Unit
and remote unit at the end
to ON. Set the terminating
resistance of other units to
OFF.
A communications error fre-
quently occurs due to noise
and so on. Use shielded twisted pair
cables.
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 RDY and
ERC indica-
tors flash
(ERR/ALM). --- *_Com_UnitPmrDatErr
(Protocol Data Error) is
set to TRUE. The protocol macro data
SUM value is abnormal. Use CX-Protocol to transfer
the correct protocol data.
The RDY indi-
cator is lit and
the ERC indi-
cator flashes
(ERR/ALM). --- Bits 00 to 03 (Protocol
macro error code) of
*_P1(orP2)_PmrSta
are set to a value other
than 0 hex. (An error
occurred) An error was detected in the
protocol macros, which
makes operation impossi-
ble. Refer to Remedy for Each
ErrorIDEx Code.