816
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
37 Operation of Special Devices (M8000 -, D8000 -)
37.1 Special Device List (M8000 -, D8000 -)
PLC Mode
M 8030
*1
Battery LED
OFF
When M8030 set to ON, LED on PLC is not lit
even if battery voltage low is detected.
→Refer to Subsection 37.2.10.
3 3 3 3 –––3 – 3
M 8031
*1
Non-latch memory
all clear
If this special auxiliary relay is activated, the
ON/OFF image memory of Y, M, S, T, and C,
and present values of T, C, D, special data
registers
*3
, and R
*2
are cleared to zero.
However, file registers (D) in program memory
and extension file registers (ER)
*2
in the
memory cassette are not cleared.
→Refer to Subsection 37.2.11.
3 3 3 3 – 3333 3
M 8032
*1
Latch memory
all clear
3 3 3 3 – 3333 3
M 8033
Memory hold
STOP
When PLC is switched from RUN to STOP,
image memory and data memory are retained.
→Refer to Subsection 37.2.12.
3 3 3 3 – 3333 3
M 8034
*1
All outputs disable
All external output contacts of PLC are turned
OFF.
→Refer to Subsection 37.2.13.
3 3 3 3 – 3333 3
M 8035
Forced RUN mode
→Refer to Subsection 37.2.14 for details.
3 3 3 3 – 3333 3
M 8036
Forced RUN signal
3 3 3 3 – 3333 3
M 8037
Forced STOP signal
3 3 3 3 – 3333 3
[M]8038
Parameter setting
Communication parameter setting flag
(for N:N network setting)
→Refer to Data Communication Edition.
3 3 3 3
D8176 to
D8180
33
3
*4
33
M 8039
Constant scan
mode
When M8039 is ON, PLC waits until scan time
specified in D8039 and then executes cyclic
operation.
→Refer to Subsection 37.2.15.
3 3 3 3 D8039 3333 3
*1. It is executed when END instruction is executed.
*2. R and ER are available only in FX3G/FX3U/FX3GC/FX3UC PLCs.
*3. Special data registers are not cleared in FX1S/FX1N/FX2N/FX1NC/FX2NC PLCs.
*4. It is available in Ver. 2.00 or later.
Number and name Operation and function
Applicable model
FX
3G
FX
3GC FX3U
FX
3UC
Correspond-
ing special
device
FX
1S
FX
1N
FX
2N
FX
1NC
FX
2NC
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