Appendix A: Special Device List; Appendix A-1 Special Auxiliary Relay (M8000 To M8511) - Mitsubishi FX3G SERIES User Manual

FX Series Programmable Controllers
3G
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
Operation and function
name
PLC Status
[M]8000
RUN
RUN monitor
input
NO contact
M8061
[M]8001
Error occurrence
RUN monitor
NC contact
[M]8002
M8000
Initial pulse
M8001
NO contact
M8002
[M]8003
Initial pulse
M8003
NC contact
ON when either M8060, M8061,
[M]8004
M8064, M8065, M8066, or M8067
Error occurrence
is ON.
[M]8005 ON when battery voltage is below
Battery voltage low the value set in D8006.
[M]8006 It is set when battery voltage low is
Battery error latch detected.
[M]8007
Not used
[M]8008
ON when 24V DC power fails in
[M]8009 either input/output powered
24V DC down extension unit or extension power
supply unit.
→ For detailed explanation, refer to the Programming Manual.
Correspond-
ing special
device
-
-
-
-
1 scan time
D8004
D8005
D8006
-
-
D8009
Appendix A-1 Special Auxiliary Relay (M8000 to M8511)
Number and
Operation and function
name
Clock
[M]8010 Not used
[M]8011
ON and OFF in 10ms cycle
10ms clock
(ON: 5ms, OFF: 5ms)
pulse
[M]8012
ON and OFF in 100ms cycle
100ms clock
(ON: 50ms, OFF: 50ms)
pulse
[M]8013 ON and OFF in 1sec cycle
1sec clock pulse (ON: 500ms, OFF: 500ms)
[M]8014 ON and OFF in 1min cycle
1min clock pulse (ON: 30sec, OFF: 30sec)
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
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 direction specification
*1
M 8024
(FNC 15)
M 8025 to M 8027 Not used
Interrupt permission during FROM/
M 8028 TO (FNC 78 and 79) instruction
execution.
[M]8029
ON when operation such as DSW
Instruction
(FNC 72) is completed.
execution complete
*1. Cleared when PLC switches from RUN to STOP.
Appendix A: Special Device List
Correspond-
ing special
device
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
349
21
22
A
B