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Appendix A: Special Device List
389
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
Appendix A-1 Special Auxiliary Relay (M8000 to M8511)
21
Memory
Cassette
22
Battery
A
Special Devices
(M8000-,D8000-)
B
Instruction List
C
Discontinued
models
D
Precautions for
battery
transportation
E
Handling of
batteries in EU
member states
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.
→ For detailed explanation, refer to the Programming Manual.
Appendix A-1 Special Auxiliary Relay (M8000 to M8511)
*1. Cleared when PLC switches from RUN to STOP.
Number and
name
Operation and function
Correspond-
ing special
device
PLC Status
[M]8000
RUN monitor
NO contact
-
[M]8001
RUN monitor
NC contact
-
[M]8002
Initial pulse
NO contact
-
[M]8003
Initial pulse
NC contact
-
[M]8004
Error occurrence
ON when either M8060, M8061,
M8064, M8065, M8066, or M8067
is ON.
D8004
[M]8005
Battery voltage low
ON when battery voltage is below
the value set in D8006.
D8005
[M]8006
Battery error latch
It is set when battery voltage low is
detected.
D8006
[M]8007
Not used
-
[M]8008 -
[M]8009
24V DC down
ON when 24V DC power fails in
any input/output powered
extension unit or special function
block.
D8009
1 scan time
RUN
input
M8000
M8001
M8002
M8003
M8061
Error occurrence
Number and
name
Operation and function
Correspond-
ing special
device
Clock
[M]8010 Not used -
[M]8011
10ms clock
pulse
ON and OFF in 10ms cycle
(ON: 5ms, OFF: 5ms)
-
[M]8012
100ms clock
pulse
ON and OFF in 100ms cycle
(ON: 50ms, OFF: 50ms)
-
[M]8013
1sec clock pulse
ON and OFF in 1sec cycle
(ON: 500ms, OFF: 500ms)
-
[M]8014
1min clock pulse
ON and OFF in 1min cycle
(ON: 30sec, OFF: 30sec)
-
M 8015
Clock stop and preset
For real time clock
-
M 8016
Time read display is stopped
For real time clock
-
M 8017
30 seconds correction
For real time clock
-
[M]8018
Installation detection (Always ON)
For real time clock
-
M 8019
Real time clock (RTC) error
For real time clock
-
Flag
[M]8020
Zero
ON when the result of addition/
subtraction is 0.
-
[M]8021
Borrow
ON when the result of subtraction is
less than the min. negative number.
-
M 8022
Carry
ON when 'carry' occurs as a result
of addition or when an overflow
occurs as a result of shift operation.
-
[M]8023 Not used -
M 8024
*1
BMOV direction specification
(FNC 15)
-
M 8025 to M 8027 Not used -
M 8028
Interrupt permission during FROM/
TO (FNC 78 and 79) instruction
execution.
-
[M]8029
Instruction
execution complete
ON when operation such as DSW
(FNC 72) is completed.
-