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APPENDICES
A
Appendix 2 List of Special Relay Areas
M9011 SM1011 SM56
Operation error
flag
OFF: No error
ON: Error
• This relay turns on when an operation
error occurs during execution of an
application instruction.
• This relay remains on even after the
system returns to normal.
Qn(H)
QnPH
QnU
*1
M9012 SM1012 SM700 Carry flag
OFF: Carry OFF
ON: Carry ON
Carry flag used in application instruction
Qn(H)
QnPH
M9016 SM1016
Data memory
clear flag
OFF: Ignored
ON: Output cleared
When SM1016 turns on and remote RUN
mode is activated from a computer, all the
data memory including the latch range
(except for the special relay and special
register) is cleared.
Qn(H)
QnPH
M9017 SM1017
Data memory
clear flag
OFF: Ignored
ON: Output cleared
When SM1017 turns on and remote RUN
mode is activated from a computer, all the
data memory that is not latched (except for
the special relay and special register) is
cleared.
Qn(H)
QnPH
M9020 SM1020
User timing
clock No.0
• This relay repeatedly turns on and off at
the specified scan intervals.
• When the CPU module is powered on or
reset, this relay is set to on from off to
start the clock. Set the intervals of on/off
by DUTY instruction.
n1: On scan interval
n2: Off scan interval
• When SM1020 to SM1024 are specified
for the DUTY instruction in programs, if
the CPU type is changed from the High
Performance model QCPU or Process
CPU to the Universal model QCPU or
LCPU, they are replaced with SM420 to
SM424. (For the Universal model QCPU
and LCPU, SM1020 to SM1024 cannot
be specified.)
Qn(H)
QnPH
QnU
*1
LCPU
M9021 SM1021
User timing
clock No.1
M9022 SM1022
User timing
clock No.2
M9023 SM1023
User timing
clock No.3
M9024 SM1024
User timing
clock No.4
M9025 SM1025
Clock data set
request
OFF: Ignored
ON: Set request
Clock data stored in SD1025 to SD1028
are written to the CPU module after the
END instruction execution in the scan
where SM1025 is turned on.
Qn(H)
QnPH
QnU
*1
LCPU
M9026 SM1026 Clock data error
OFF: No error
ON: Error
This relay turns on if an error occurs in the
clock data (SD1025 to SD1028), and is off
while there is no error.
Qn(H)
QnPH
QnU
*1
LCPU
M9028 SM1028
Clock data read
request
OFF: Ignored
ON: Read request
This relay is turned on to read clock data
and store them as BCD values into
SD1025 to SD1028.
Qn(H)
QnPH
QnU
*1
LCPU
M9029 SM1029
Batch
processing of
data
communications
requests
OFF: Batch processing
not conducted
ON: Batch processing
conducted
• When this relay is turned on in the
program, all the data communication
requests accepted during one scan are
processed in the END processing of that
scan.
• The batch processing of data
communication requests can be turned
on or off during running.
• The default is OFF (processed one at a
time for each END processing in the
order in which data communication
requests are accepted).
Qn(H)
QnPH
ACPU
Special
Relay
Special
Relay after
Conversion
Special
Relay after
Modification
Name Meaning Details
Corresponding
CPU
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