Mitsubishi FX3U Series, Руководство по программированию

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838
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
36 Operation of Special Devices (M8000 -, D8000 -)
36.2 Supplement of Special Devices (M8000 - and D8000 -)
5. Cautions for communication setting devices (D8120, D8121 and D8129)
The special data register D8120 (communication format setting), D8121 (station number setting), and D8129
(time-out check time) are backed up by the battery.
When using the batteryless function, reset these special data registers once, and then transfer proper set
values to them by program.
The communication conditions can be set in the parameter settings.
When the communication conditions are set in the parameter settings, the PLC transfers the parameter
values to the above special data registers before operation. Thus it is recommended to set the
communication conditions via the parameter settings.
36.2.11 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)
36.2.12 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
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.
36.2.13 All outputs disable [M8034]
When M8034 is turned ON, the output latch memory is cleared. As a result, all actual output relay terminals
are turned OFF, and the PLC is operated in the image memory.
1. Program example
Device number Cleared devices
M8031
(non-latch memory
all clear)
• Contact image of input relay (X), 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)
M8032
(latch memory all
clear)
• 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
M8033
Outputs are retained even during STOP mode.
Command
input
M8034
All outputs are disabled (image RUN status).
Command
input