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9-17
9 Troubleshooting and Maintenance
CJ-series Serial Communications Units Operation Manual for NJ-series CPU Unit(W494)
9-3 T
rou
b
lesho
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 do
not flash at all.
(Communica-
tions was not
electrically
established.)
The ExecPMCR
instruction is exe-
cuted, but
*_P1(orP2)_PmrE
xecSta (Protocol
Macro Executing
Flag) is not set to
TRUE. Bits 00 to 03 (Protocol
macro error code) of
*_P1(orP2)_PmrSta
are set to 2 hex
(Sequence No. error). The sequence number
specified in the ExecPMCR
instruction input variable
SeqNo is a value other than
000 to 999 in decimal nota-
tion.
The specified communica-
tions sequence number
does not exist in the proto-
col data.
Set the ExecPMCR instruc-
tion input variable SeqNo to
a value between 000 to 999
in decimal notation.
Check whether the commu-
nications sequence number
is correct.
Bits 00 to 03 (Protocol
macro error code) of
*_P1(orP2)_PmrSta
are set to 4 hex (Proto-
col data syntax error). The protocol data in the Unit
is incorrect. Use CX-Protocol to correct
and transfer the protocol
data.
As ExecPMCR instruc-
tion execution condi-
tions, the Network
Communications
Instruction Enabled
Flag
(_Port_isAvailable) is
used as N.C. The program is incorrect. As ExecPMCR instruction
execution conditions, set the
Network Communications
Instruction Enabled Flag
(_Port_isAvailable) to an
N.O.
*_P1(orP2)_Operating
Sta (Port Operating
Status) remains
FALSE (Port stopped). Protocol data is being trans-
ferred, or a SUM value error
occurred. Wait for the transfer of pro-
tocol data to finish or use
CX-Protocol to transfer the
protocol data.
*_P1(orP2)_PmrE
xecSta (Protocol
Macro Executing
Flag) is set to
TRUE when the
SendPMR
instruction is exe-
cuted, but data
can not be prop-
erly sent or
received. Send processing is not
executed. The send wait time specified
in communications
sequence step units is too
long. Use CX-Protocol to check
whether the send wait time
is correctly set.
*_P1(orP2)_RmtBusyS
ta (Remote Unit Busy)
is set to TRUE
(Remote Unit busy). The CTS (CS) signal from
the Remote Unit cannot be
set to TRUE (the Remote
Unit remains in busy status)
because the transmission
control parameter RS/CS
Flow Control is set to "yes". Release the Remote Unit
busy status to enable the
Local Unit CTS (CS) signal
to set to TRUE.
*_P1(orP2)_PmrSeqW
aitSta (Sequence Wait
Flag) is set to TRUE
(Sequence wait sta-
tus). Wait command can not be
canceled. Review the program so that
*_P1(orP2)_PmrWaitRlsCm
d (Wait Release Switch) is
changed to TRUE.
The
SD
@
/RD
@
indicators do
not flash at all.
(Communica-
tions was not
electrically
established.)
*_P1(orP2)_PmrE
xecSta (Protoc-
col Macro Execut-
ing Flag) either is
changed to ON
momentarily
when the ExecP-
MCR instruction
is executed, or it
is not changed to
ON at all. *_P1(orP2)_PmrAbtC
md (Abort Switch) is
force-set. Abort Switch is force-set. Release the Abort Switch.