Mitsubishi Electronics FX3G

820

FX3G/FX3U/FX3UC Series Programmable Controllers

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

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 –3333 3

M 8032*1

Latch memory

all clear

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 –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 –3333 3

M 8035

Forced RUN mode

→Refer to Subsection 37.2.14 for details.

3 3 3 –3333 3

M 8036

Forced RUN signal 3 3 3 –3333 3

M 8037

Forced STOP signal 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 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 D8039 3333 3

*1. It is executed when END instruction is executed.

*2. R and ER are available only in FX3G/FX3U/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

3G FX3U

3UC

Correspond-

ing special

device

1NC

2NC