Chapter 16 PLC Function ApplicationsMH300
16-5-2 Introduction to special relay functions (special M)
R/W column: RO means read only; RW means read and write.
Special M Function Descriptions R/W
M1000
Monitors N.O. contact (contact A). N.O. while RUN, contact A. This contact is
ON while in the RUN state.
RO
M1001
Monitors N.C. contact (contact B). N.C. while RUN, contact B. This contact is
OFF while in the RUN state.
RO
M1002
Initiates a forward pulse (the instant RUN is ON). Initial pulse, contact A.
Produces a forward pulse when RUN begins; pulse width = scan cycle.
RO
M1003
Initiates a reverse pulse (the instant RUN is OFF). Initial pulse, contact A.
Produces a reverse pulse when RUN ends; pulse width = scan cycle.
RO
M1004 -- RO
M1005 Drive malfunction instructions RO
M1006 Drive has no output RO
M1007 Drive direction FWD (0) / REV (1) RO
M1008
–
M1010
-- --
M1011 10ms clock pulse, 5 ms ON / 5 ms OFF. RO
M1012 100ms clock pulse, 50 ms ON / 50 ms OFF. RO
M1013 1 sec. clock pulse, 0.5 s ON / 0.5 s OFF. RO
M1014 1 min. clock pulse, 30 s ON / 30 s OFF. RO
M1015 Frequency reached (when used with M1025) RO
M1016 Parameter read/write error RO
M1017 Parameter write successful RO
M1018 -- --
M1019 -- --
M1020 Zero flag RO
M1021 Borrow flag RO
M1022 Carry flag RO
M1023 Divisor is 0 RO
M1024 -- --
M1025
Drive frequency = set frequency (ON)
Drive frequency = 0 (OFF)
RW
M1026 Drive operating direction FWD (OFF) / REV (ON) RW
M1027 Drive Reset RW
M1028 -- --
M1029 -- --
M1030 -- --
M1031 -- --
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