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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)

(b) Data in the memory card

(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.

Mitsubishi Q2ACPU User Manual

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