Operation Of Special Devices (M8000 -, D8000 -); Special Device List (M8000 -, D8000 -); Special Auxiliary Relay (M8000 To M8511) - Mitsubishi FX3U Series Programming Manual

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

36. Operation of Special Devices (M8000 -, D8000 -)

36.1

Special Device List (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.
→ Refer to Section 36.2 for supplementary information on analog special adapter devices.

36.1.1 Special Auxiliary Relay (M8000 to M8511)

Number and name
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
• FX
ON when either M8060, M8061, M8064, M8065,
[M]8004 M8066, or M8067 is ON.
Error occurrence • FX
ON when either M8060, M8061, M8063, M8064,
M8065, M8066, or M8067 is ON.
ON when battery voltage is below the value set in
[M]8005
D8006.
Battery voltage low
[M]8006 It is set when battery voltage low is detected.
Battery error latch
ON for 1 scan, when detecting momentary power
failure
[M]8007
Even if M8007 turns ON, PLC continues to RUN
Momentary power
mode in case duration of power loss is within period
failure
of time specified in D8008.
It is set when momentary power failure is detected.
[M]8008 If power loss time is longer than period of time
Power failure specified in D8008, M8008 is reset and PLC is turned
detected in STOP mode.(M8000=OFF).
ON when 24V DC power fails in either powered
[M]8009
24V DC down
extension unit or extension power supply unit
*1. Powered extension units are applicable only to FX
Extension power supply units are applicable only to FX
800
Operation and function
RUN
input
M8061
Error occurrence
M8000
M8001
M8002
M8003
1 scan time
→Refer to Subsection 36.2.1.
, FX
3U 3UC
,FX ,FX ,FX ,FX
1S 1N 2N 1NC 2NC
→Refer to Subsection 36.2.3.
→Refer to Subsection 36.2.3.
→Refer to Subsection 36.2.4.
→Refer to Subsection 36.2.4.
36 Operation of Special Devices (M8000 -, D8000 -)
36.1 Special Device List (M8000 -, D8000 -)
Correspond-
FX FX ing special
3U 3UC
device
D8004
D8005
D8006
D8007
D8008
D8008
D8009
*1
.
/FX /FX PLCs.
1N 2N 3U
PLCs.
3UC
Applicable model
FX FX FX FX
1S 1N 2N
–
–
–
–
– –
– –
– –
– –
– –
FX
1NC 2NC
–
–
–
–
–