Supplement Of Special Devices (M8000 And Later And D8000 And Later); Run Monitor And Initial Pulse [M8000 To M8003] - Mitsubishi Electric MELSEC-Q Structured Programming Manual

FXCPU Structured Programming Manual
[Device & Common]
4.2

Supplement of Special Devices (M8000 and later and D8000 and later)

This section explains how to use special devices provided to activate functions built in the PLC.
4.2.1

RUN monitor and initial pulse [M8000 to M8003]

1. RUN monitor (M8000 and M8001)
Use the RUN monitor (M8000 and M8001) which indicates the PLC operation status to drive instructions and
give external display "normally operating".
1) Program example
M8000
RUN monitor(NO contact)
Always ON while the PLC
is in the RUN mode.
M8001 is always OFF while the PLC is in the RUN mode.
2) Flag operation timing
RUN input
M8000
RUN monitor(NO contact)
M8001
RUN monitor(NC contact)
M8002
Initial pulse(NO contact)
M8003
Initial pulse(NC contact)
2. Initial pulse (M8002 and M8003)
The initial pulse (M8002 and M8003) remains ON or OFF instantaneously (only for 1 scan time) when the
PLC starts operation.
Use the initial pulse as the initial setting signal in a program for initializing the program or writing specified
values.
1) Program example
M8002
Initial pulse (NO contact)
M8003 remains OFF instantaneously (only for 1 scan time) after the PLC becomes the RUN mode.
2) Flag operation timing
RUN input
M8000
RUN monitor(NO contact)
M8001
RUN monitor(NC contact)
M8002
Initial pulse(NO contact)
M8003
Initial pulse(NC contact)
216
4 Operations of Special Devices (M8000 and later, D8000 and later)
4.2 Supplement of Special Devices (M8000 and later and D8000 and later)
"Normally operating"
Y000
Output to be always driven
RUN STOP
ON
ON
1 scan time
ON
ON
ZRST
Latched (backed-up) type
EN ENO
data registers D200 to D209
d1
D200
are cleared.
d2
D299
RUN STOP
ON
ON
1 scan time
ON
ON