Mitsubishi Q2ACPU, User Manual

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12.
12 - 27
OVERVIEW OF PROCESSING PERFORMED BY THE QnACPU
12.4 Data Clear Processing
The QnACPU clears data other than the following by turning the RUN/STOP key switch to
RESET or by resetting the PLC power (ON, OFF and ON):
(a) Data in the built-in RAM (except data specified for memory clear in the boot
specification)
*1
(b) Data in the memory card
(c) Data of latch-specified devices(Latch clear key enabled)
(d) Data of latch-specified devices(Latch clear key disabled)
(e) File register data
(f) Local device data
(g) Fault history data
*1 For the boot specification, refer to the QnACPU Programming Manual (Fundamentals).
Data given in (c) and (g) are cleared by latch clear operation using the RUN/STOP key
switch (Refer to Section 15.3.) or by remote latch clear operation from GPP function (Refer
to Section 10.6.5.)
The latch range is specified for each device on the "Device" screen in the parameter mode
of GPP function. There are the following two latch range setting options.
Devices for which the latch clear key is disabled can be cleared by an instruction or by the
clear operation of GPP function.
For details on device latch ranges, refer to the QnACPU Programming Manual
(Fundamentals).
For details on the operation method of GPP function, refer to the GX Developer Operating
Manual or Type SW IVD-GPPQ Software Package Operating Manual (Online)/(Offline).
1) Latch clear key enabled : Used to set a latch range which can be cleared by
the latch clear operation using the RUN/STOP key
switch.
2) Latch clear key disabled: Used to set a latch range which cannot be cleared
by the latch clear operation using the RUN/STOP
key switch.
POINT
To clear file registers or local devices, reset them with the RST instruction or
transfer KO with the MOV instruction.
1) Clearing by an instruction : Reset by RST instruction , or transfer K0
with MOV instruction .
2) Clearing by GPP function : Execute device memory all clear from the
PLC menu in the online mode.