Clear Command [M8031 And M8032]; Memory Hold Stop [M8033] (Output Hold In Stop Mode); All Outputs Disable [M8034] - Mitsubishi Electric MELSEC FX3U Programming Manual

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

37.2.12 Clear command [M8031 and M8032]

For all devices (image memory) in the PLC, the latch (battery backed) areas and non-latch areas can be
cleared.
M8031 (non-latch memory all clear), M8032 (latch memory all clear)
Device number
*1
M8031
(non-latch memory
all clear)
M8032
(latch memory all
clear)
*1. When the optional battery is installed in FX
latch (battery backed) type are handled as devices in latch areas.

37.2.13 Memory hold stop [M8033] (output hold in STOP mode)

When the special auxiliary relay M8033 is turned ON, the output status in the RUN mode is retained even if
the PLC status switches from RUN to STOP.
1. Example program
Command
input
M8033
For example, when a heater is driven by the PLC, the PLC can be stopped while the heater and other
equipment are kept driven, and then the PLC can be started again after program changes.

37.2.14 All outputs disable [M8034]

When M8034 is turned ON, the output memory is cleared. As a result, all actual output relay contacts are
turned OFF and the PLC is operated in the image memory.
1. Program example
Command
input
M8034
• Contact image of output relay (Y), general type auxiliary relay (M), and general type state relay (S)
• Contact and coil of timer (T)
• Contact, counting coil, and reset coil of general type counter (C)
• Present value of general type data register (D)
• Present value register of timer (T)
• Present value register of general type counter (C)
• Extension register for general
• Contact image of latch (battery backed) type auxiliary relay (M) and latch (battery backed) type
state relay (S)
• Contact and coil of retentive type timer (T)
• Contact, counting coil, and reset coil of latch (battery backed) type counter and high speed
counter
• Present value of latch (battery backed) type data register (D)
• Present value register of retentive type timer (T) and 1-ms timer (T)
• Present value register of latch (battery backed) type counter and high speed counter
• Latch (battery backed) type extension register (R)
Outputs are retained even during STOP mode.
All outputs are disabled (image RUN status).
37 Operation of Special Devices (M8000 -, D8000 -)
37.2 Supplement of Special Devices (M8000 - and D8000 -)
Cleared devices
PLCs, general type devices which were changed to the
3G
31
32
33
34
35
36
37
38
A
B
919