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APPENDICES
MELSEC-Q
Special Relay List (Continue)
Number
Name
Description
Details
Applicable CPU
M9016
Data memory
clear flag
OFF: No processing
ON: Output clear
• Clears the data memory including the latch range
(other than special relays and special registers) in
remote run mode from computer, etc. when M9016
is on.
M9017
Data memory
clear flag
OFF: No processing
ON: Output clear
• Clears the unlatched data memory (other than
special relays and special registers) in remote run
mode from computer, etc. when M9017 is on.
2 Data link monitor OFF: F link
M9018 switching
ON: R link
M9020
User timing clock
No. 0
M9021
User timing clock
No. 1
M9022
User timing clock
No. 2
M9023
User timing clock
No. 3
M9024
User timing clock
No. 4
n2
scan
• Specifies the lines to be monitored for link
monitoring.
n2
scan
• 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
scan
DUTY
n1
n2
Usable with all types
of CPUs.
Usable with all types
of CPUs.
 Dedicated to A3V.
Usable with all types
of CPUs.
M9020
• Writes clock data from D9025-D9028 to the clock
element after the END instruction is executed
Unusable with An,
A3H, A3M, A3V,
A2C, A52G, and
A0J2H.
2 Clock data set
M9025 request
OFF: No processing
ON: Set requested
M9026
Clock data error
OFF: No error
ON: Error
• Switched on by clock data (D9025 to D9028) error.
Unusable with An,
A3H, A3M, A3V,
A2C, A52G and
A0J2H.
M9027
Clock data
display
OFF: No processing
ON: Display
• Clock data is read from D9025-D9028 and month,
day, hour, minute and minute are indicated on the
CPU front LED display.
Usable with A3N,
A3A, A3U, A4U, A73
and A3N board.
OFF: No processing
ON: Read request
• Reads clock data to D9025-D9028 in BCD when
M9028 is on.
Unusable with An,
A3H, A3M, A3V, A2C
and A0J2H.
• 0.1 second, 0.2 second, 1 second, 2 second, and 1
minute clocks are generated.
• Not turned on and off per scan but turned on and off
even during scan if corresponding time has elapsed.
• Starts with off when power is turned on or reset is
performed.
Unusable with A3V.
2 Clock data read
M9028 request
M9030
0.1 second
clock
M9031
0.2 second
clock
M9032
1 second
clock
M9033
2 second
clock
M9034
1 minute
clock
0.05
seconds
0.1
seconds
0.5
seconds
1
second
30
seconds
during the scan in which M9025 has changed from
off to on.
0.05
seconds
0.1
seconds
0.5
seconds
1
second
30
seconds
App - 10