Appendix A: Special Device List; Appendix A-1 Special Auxiliary Relay (M8000 To M8511) - Mitsubishi Electric MELSEQ FX3S Series User Manual

FX Series Programmable Controllers
3S
User's Manual - Hardware Edition

Appendix A: Special Device List

The device numbers and functions of the special auxiliary relays (indicated as "special M" in tables) and
special data registers (indicated as "special D" in tables) are shown below.
Note that functions of certain devices vary depending on the series of the PLC.
Do not use the undefined/blank special auxiliary relays and special data registers in the sequence program
since they are occupied by the CPU.
In addition, do not activate or write to the devices with brackets on the first letter such as [M]8000 or [D]8001
in the program.

Appendix A-1 Special Auxiliary Relay (M8000 to M8511)

Number and name Operation and function
PLC status
[M]8000
RUN
RUN monitor
input
NO contact
M8061
[M]8001
Error occurrence
RUN monitor
NC contact
M8000
[M]8002
Initial pulse
M8001
NO contact
M8002
[M]8003
Initial pulse
M8003
NC contact
ON when either M8061, M8062,
[M]8004
M8064, M8065, M8066, or M8067 is
Error occurrence
ON.
[M]8005 to [M]8009 Not used
Clock
[M]8010 Not used
[M]8011 ON and OFF in 10 ms cycle
10 ms clock pulse (ON: 5 ms, OFF: 5 ms)
[M]8012 ON and OFF in 100 ms cycle
100 ms clock pulse (ON: 50 ms, OFF: 50 ms)
[M]8013 ON and OFF in 1 sec cycle
1 sec clock pulse (ON: 500 ms, OFF: 500 ms)
[M]8014 ON and OFF in 1 min cycle
1 min clock pulse (ON: 30 sec, OFF: 30 sec)
Clock stop and preset
M 8015
For real time clock
Time read display is stopped
M 8016
For real time clock
±30 seconds correction
M 8017
For real time clock
Installation detection (Always ON)
[M]8018
For real time clock
Real time clock (RTC) error
M 8019
For real time clock
→ For detailed explanation, refer to the Programming Manual.
Correspond-
ing special
device
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-
1 scan time
D8004
-
-
-
-
-
-
-
-
-
-
-
Appendix A-1 Special Auxiliary Relay (M8000 to M8511)
Number and name Operation and function
Flag
[M]8020 ON when the result of addition/
Zero subtraction is 0.
[M]8021 ON when the result of subtraction is
Borrow less than the min. negative number.
ON when 'carry' occurs as a result
M 8022
of addition or when an overflow
Carry
occurs as a result of shift operation.
[M]8023 Not used
BMOV instruction (FNC 15)
*1
M 8024
direction specification
[M]8025 to [M]8027 Not used
M 8028 100 ms/10 ms timer changeover
[M]8029
ON when operation such as DSW
Instruction
instruction (FNC 72) is completed.
execution complete
PLC mode
M 8030 Not used
*2 If this special auxiliary relay is
M 8031
activated, the ON/OFF image
Non-latch memory
memory of Y, M, S, T, and C, and
all clear
present values of T, C, D and
special data registers are cleared to
*2
M 8032
zero.
Latch memory all
However, file registers (D) in
clear
program memory.
When PLC is switched from RUN to
M 8033
STOP, image memory and data
Memory hold STOP
memory are retained.
*2
All external output contacts of PLC
M 8034
are turned OFF.
All outputs disable
M 8035
Forced RUN mode
M 8036
Refer to Programming Manual for
Forced RUN signal
details.
M 8037
Forced STOP
signal
[M]8038 Communication parameter setting
Parameter setting flag (for N:N network setting)
M 8039 When M8039 is ON, PLC waits until
Constant scan scan time specified in D8039 and
mode then executes cyclic operation.
*1. Cleared when PLC switches from RUN to STOP.
*2. Executed at END instruction.
Appendix A: Special Device List
Correspond-
ing special
device
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-
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-
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-
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-
D8176 to
D8180
D8039
187
11
12
13
14
15
16
17
A
B
C