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9 Troubleshooting and Maintenance
9-16
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).
9-3-3 Protocol Macros
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 not
set to proto-
col macro. --- --- Bits 12 to 15 (Serial
communications
mode) of
*P1(orP2)_SysSetSta
are set to a value other
than 6 hex. Serial communications
mode is not set correctly. Set bits 08 to 11 (Serial
communications mode) of
*_P1(orP2)_PortCfg to 6
hex (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. As ExecPMCR instruc-
tion execution condi-
tions,
*_P1(orP2)_PmrExecS
ta (Protocol Macro
Executing Flag) is
used as N.O. The program is incorrect. As ExecPMCR instruction
execution conditions, use
*_P1(orP2)_PmrExecSta
(Protocol Macro Executing
Flag) as N.C.
The output variable
Error of the Exec
PMCR instruction is
TRUE. • This instruction was exe-
cuted when the Serial
Communications Mode
was not Protocol Macro
Mode.
• The value of
_Port_isAvailable is set to
FALSE.
• The value of SeqNo is out
of valid range.
• The value of Port.UnitNo
or Port.PhysicPortNo is
out of the valid range.
• The Serial Communica-
tions Unit is not mounted
at the specified Unit num-
ber.
• The value of SrcDat[0]
exceeds the size in Src-
Dat[].
• The value of DstDat[0]
exceeds the size in Dst-
Dat[].
• The value of SrcDat[0] or
DstDat[0] exceeds 250
words.
• The user-defined variable
of DstDat[] is not AT spec-
ified.
• The AT specified address
of the user-defined vari-
able of DstDat[] does not
match the address speci-
fied in the protocol macro.
• Check the ExecPMCR
instruction I/O variable
settings for errors.
• Review the program for
instances where the
causes specified on the
left might occur.