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9 Troubleshooting and Maintenance
9-18
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
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.
*_P1(orP2)_PmrS
eqAbtSta
(Sequence Abort
Completion Flag)
is set to TRUE. The sequence is
aborted (the step is
interrupted). Protocol macro data is not
set correctly.
The system settings such as
the baud rate and frame for-
mat differ from those of the
Remote Unit.
Use CX-Protocol transmis-
sion line trace to check
whether the protocol data
and System Settings are
correct.
*_P1(orP2)_PmrE
xecSta (Protocol
Macro Executing
Flag) remains ON
when the Exec
PMCR instruc-
tion is executed
without setting the
monitoring time in
sequence units. The sequence is run-
ning and does not end
(in receive status).
Send data was
transmitted, but
there is no
response from the
Remote Unit. The contents of
*_P1(orP2)_SysSetSta
(System Settings) do
not match 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 System Set-
tings.
Review the Remote Unit
settings and the program
(including the baud rate,
frame format, and so on).
• *_P1(orP2)_TransErr
(Transmission error)
is set to TRUE.
• The error for any of
the
P1(orP2)_TransErrSt
a bits 0 to 14 is set to
TRUE.
The wiring is faulty.
The setting of the 2/4-wire
switch for the RS-422A/485
port does not match the
actual wiring.
The wiring of adapters such
as the NT-AL001 is faulty.
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.
--- This is a hardware error. Set bits 08 to 11 (Serial
communications mode) of
*_P1(orP2)_PortCfg to F
hex (Loopback Test), con-
nect the connector wired for
a loopback test, then set
*_P1(orP2)_LbtTestTrigCmd
to TRUE to conduct a loop-
back test.
The test data is reflected in
*_P1(orP2)_PmrSta.
If an error occurs during the
test, replace the Unit.
(The loopback test result is
also reflected in
*_P1(orP2)_LbtSta.)
The
SD
@ /RD @
indicators
flash, but the
Unit cannot
perform com-
munications
or a communi-
cations error
sometimes
occurs.
A transmission
error occurs. • *_P1(orP2)_TransErr
Sta (Transmission
Error Status) is set to
TRUE.
• The error for any of
bits 0 to 14 is set to
TRUE.
The system settings such as
the baud rate and frame for-
mat differ from those of the
Remote Unit. The baud rate
is outside the allowable
range, or there are bit errors
due to mismatched stop bits
and so on. Review the system settings.
Review the Remote Unit
settings and the program
(including the baud rate,
frame format, and so on).