Appendix A: Operation Of Special Devices (M8000 -, D8000 -); Appendix A-1 Special Auxiliary Relay (M8000 To M8511) - Mitsubishi FX3U SERIES User Manual

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

Appendix A: Operation of Special Devices (M8000 -, D8000 -)

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
Error occurrence
[M]8001
RUN monitor
NC contact
M8000
[M]8002
M8001
Initial pulse
NO contact
M8002
[M]8003
M8003
Initial pulse
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
the value set in D8006.
low
[M]8006 It is set when battery voltage low is
Battery error latch detected.
ON for 1 scan, when detecting
momentary power failure
[M]8007
Even if M8007 turns ON, PLC
Momentary power
continues to RUN mode in case
failure
duration of power loss is within
period of time specified in D8008.
It is set when momentary power
failure is detected.
[M]8008
If power loss time is longer than
Power failure
period of time specified in D8008,
detected
M8008 is reset and PLC is turned
in STOP mode.(M8000=OFF).
[M]8009 ON when 24V DC power fails in
24V DC down either powered extension unit
→ For detailed explanation, refer to the Programming Manual.
Correspond-
ing special
device
–
–
–
–
1 scan time
D8004
D8005
D8006
D8007
D8008
D8008
D8009
A Operation of Special Devices (M8000 -, D8000 -)
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 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
(ON: 50 ms, OFF: 50 ms)
pulse
[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
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)
HSC mode
*1
M 8025
(FNC 53 to 55)
RAMP mode
*1
M 8026
(FNC 67)
PR mode
*1
M 8027
(FNC 77)
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.
21
22
A
Correspond-
ing special
B
device
–
–
C
–
–
–
–
D
–
–
–
–
–
–
–
–
–
–
–
–
–
–
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