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Appendix 3 SPECIAL RELAY LIST
*1: The relevant modules are as follows:
• The Universal model QCPU whose serial number (first five digits) is "10102" or later.
• Q00UJCPU, Q00UCPU, Q01UCPU
TableApp.3.11 Special relay
ACPU
Special
Relay
Special
Relay after
Conversion
Special
Relay for
Modification
Name Meaning Details
Corresponding
CPU
M9005 SM1005
–
AC DOWN
detection
OFF : AC DOWN not
detected
ON : AC DOWN detected
• Turns ON if an instantaneous power failure of within 20ms
occurs during use of the AC power supply module.
• Reset when the power supply is switched OFF, then ON.
Qn(H)
QnPH
QnU
*1
• Turns ON if an instantaneous power failure of within 10ms
occurs during use of the DC power supply module.
• Reset when the power supply is switched OFF, then ON.
M9006 SM1006
–
Battery low
OFF : Normal
ON : Battery low
• Turns ON when the battery voltage drops to or below the
specified.
• Turns OFF when the battery voltage returns to normal
thereafter.
M9007 SM1007
–
Battery low latch
OFF : Normal
ON : Battery low
• Turns ON when the battery voltage drops to or below the
specified.
• Remains ON if the battery voltage returns to normal
thereafter.
M9008 SM1008 SM1
Self-diagnosis
error
OFF : No error
ON : Error
• Turned on when error is found as a result of self-
diagnosis.
M9009 SM1009 SM62
Annunciator
detection
OFF : No F number detected
ON : F number detected
• Turned on when OUT F of SET F instruction is
executed.
• Switched off when SD1124 data is cleared to zero.
M9011 SM1011 SM56
Operation error
flag
OFF : No error
ON : Error
• Turned on when operation error occurs during execution
of application instruction.
• Remains ON if the condition is restored to normal
thereafter.
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 : lgnored
ON : Output claered
• Clears the data memory including the latch range (other
than special relays and special registers) in remote run
mode from computer, etc. when SM1016 is on.
M9017 SM1017
Data memory clear
flag
OFF : lgnored
ON : Output claered
• Clears the unlatched data memory (other than special
relays and special registers) in remote run mode from
computer, etc. when SM1017 is on.
M9020 SM1020
–
User timing clock
No.0
• Relay which repeats on/off at intervals of predetermined
scan.
• When power is turned on or reset is per-formed, the clock
starts with off.
Set the intervals of on/off by DUTY instruction.
n1: ON scan interval
n2: OFF scan interval
* : If DUTY instruction, which specified from SM 1020 to
SM 1024 of User timing clock in programs other than a
program for a Universal model QCPU, changes the
programmable controller to the Universal model
QCPU, the special relays SM 420 to 424 will be
replaced.
(Universal model QCPUs cannot specify the special
relays from SM 1020 to SM1024.)
Qn(H)
QnPH
QnU
*1
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 present
used
• Writes the clock data stored in SD1025 to SD1028 to the
CPU module after the END instruction is executed in the
scan in which SM1025 turned from OFF to ON.
M9026 SM1026
–
Clock data error
OFF : No error
ON : Error
• Switched on by clock data (SD1025 to SD1028) error
M9028 SM1028
–
Clock data read
request
OFF : Ignored
ON : Read request
• Reads clock data to SD1025 to SD1028 in BCD when
SD1028 is on.
M9029 SM1029
Batch processing
of data
communications
requests
OFF : Batch processing not
conducted
ON : Batch processing
conducted
• The SM1029 relay is turned on using a sequence program
to process all data communication requests accepted
during one scan in the END processing of that scan.
• The batch processing of the data communication requests
can be turned on and 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
M9030 SM1030
–
0.1 second clock
• 0.1 second, 0.2 second, 1 second and 2 second, clocks
are generated.
• Not turned on or off per scan but turned on and off even
during scan if corresponding time has elapsed.
• Starts with off when Programmable Controller power
supply is turned on or CPU module reset is performed.
Qn(H)
QnPH
QnU
*1
M9031 SM1031
–
0.2 second clock
M9032 SM1032
–
1 second clock
M9033 SM1033
–
2 second clock
n1 scan
n2 scan n2 scan
DUTY n1 n2 SM1020
0.05s
0.05s
0.1s
0.1s
0.5s
0.5s
1s
1s