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CHAPTER3 CPU MODULE OPERATION
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3.7 Data Clear Processing
3.7 Data Clear Processing
This section describes how to clear data in the CPU module and the setting required for the latch data
clear.
(1) Clearing data in the CPU module
Data in the CPU module are cleared when the reset operation (by the RUN/STOP/RESET switch or by powering
the module off and then on) is performed.
However, data in (a) below cannot be cleared by the reset operation.
(a) Data that cannot be cleared by the reset operation
• Data in the program memory
• Data in the standard ROM
• Data in a memory card
•
Data in latch-specified devices ( (2) in this section)
• Data in the file register
(b) Clearing data that cannot be cleared by the reset operation
1) Data in the program memory
Data can be cleared by:
• selecting the "Clear program memory" checkbox in the Boot file tab of the PLC parameter dialog box, or
Note3.1Note1
• selecting [Online] [Delete PLC data] in GX Developer
2) Data in the standard ROM
Data can be cleared automatically when the data is written to the standard ROM.
3) Data in a memory card
Data can be cleared by selecting [Online] [Delete PLC data] in GX Developer.
4) Data in latch-specified devices
Refer to (2) in this section.
5) Data in the file register
Data can be cleared by:
• resetting devices with the RST instruction,
•
transferring K0 with the MOV or FMOV instruction, or
MELSEC-Q/L Programming Manual (Common Instruction)
• executing "Clear all file registers" from the screen opened by selecting [Online] [Clear PLC
memory] in GX Developer.
Note1
Note3.1
The "Clear program memory" checkbox cannot be selected in the Basic model QCPU.
Basic
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