Supplement Of Special Devices (M8000 - And D8000 -); Run Monitor And Initial Pulse [M8000 To M8003] - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
37.2

Supplement of Special Devices (M8000 - and D8000 -)

This section explains how to use the provided special devices to activate built-in PLC functions for additional
program control.

37.2.1 RUN monitor and initial pulse [M8000 to M8003]

1. RUN monitor (M8000 and M8001)
The RUN monitor (M8000 and M8001) may be used to continually drive an output during PLC "normal
operation."
1) Example program
M8000
RUN monitor (NO contact)
Always ON while the PLC
is in 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 & M8003 is turned to ON or OFF respectively during the 1st scan of the PLC program.
It can be utilized as an initial setting signal in a program for initializing the program, for writing a specified
value, or for another purpose.
1) Example program
M8002
Initial pulse (NO contact)
M8003 turns OFF momentarily (for only 1 scan time) when the PLC enters 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)
37.2 Supplement of Special Devices (M8000 - and D8000 -)
"Normal operation"
Y000
Output to be always driven
RUN STOP
ON
ON
1 scan time
ON ON
ON
FNC40 The latched (battery backed) type data registers D200
D200 D299
ZRST
to D299 are cleared.
RUN STOP
ON
ON
1 scan time
ON ON
ON
37 Operation of Special Devices (M8000 -, D8000 -)
RUN
ON
ON
RUN
ON
ON
31
32
33
34
35
36
37
38
A
B
909