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9-2SectionBoard Replacement
125
9-2-2 Protocol Macros
Serial
commu-
nications
mode
Indicator
display
Status
information,
etc.
I/O memory Cause Remedy
Serial com-
munica-
tions mode
is not set to
protocol
macro.
--- --- Bits 12 to 15 (Serial
Communications
Mode) of
DM 6555/DM 6550
are set to a value
other than 6 Hex.
Serial communications
mode is not set correctly.
Set bits 12 to 15 of
DM 6555/DM 6550 to
6 Hex. (protocol mac-
ros).
Serial com-
munica-
tions mode
is set to
protocol
macro.
The
COMMj
indicators
do not
flash at all.
(Commu-
The PMCR(––)
instruction was
executed, but
IR 20708 or
IR 20712 (Pro-
tocol Macro Ex-
IR 20708 or
IR 20712 (Protocol
Macro Executing
Flag) is set as a NO
execution condition
for PMCR(––).
The program is incor-
rect.
Set IR 20708 or
IR 20712 (Protocol Mac-
ro Executing Flag) as a
NC execution condition
for PMCR(––).
nications
has not
been elec-
trically es-
tablished.)
ecuting Flag)
did not turn ON.
The Error Flag
(SR 25503) is ON.
The problem cause is
one of the following:
– The data range for the
PMCR(––) instruction C
operand is incorrect.
– The number of data
words in the S or D op-
erand exceeds 129.
Check the PMCR(––)
instruction C, S, and D
operand settings for er-
rors.
The error code in
IR 20408 to
IR 20411 or
IR 20412 to
IR 20415 is 2 Hex
(Sequence Number
Error).
The sequence number
specified in bits 00 to 11
of the PMCR(––) instruc-
tion C operand is a value
other than 000 Hex to
999 BCD.
The specified commu-
nications sequence
number does not exist in
the protocol data.
Set bits 00 to 11 of the
PMCR(––) instruction C
operand to a value be-
tween 000 and 999
BCD.
Check whether the com-
munications sequence
number is correct.
The error code in
IR 20408 to
IR 20411 or
IR 20412 to
IR 20415 is 3 Hex
(Receive Data Write
Range Overflow Er-
ror)
The data range of the
specified area is exceed-
ed when data is being
written to or read from
the I/O memory of the
CPU Unit.
Specify another area, or
reduce the size of the
data to be sent or re-
ceived.