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3.7 Data Clear Processing
3
SEQUENCE PROGRAM CONFIGURATION AND
EXECUTION CONDITIONS
3.7 Data Clear Processing
This section explains how to clear the CPU module data and the settings about the latch
data clearing.
(1) Clearing data in the CPU module
Data in the CPU module can be cleared when the reset operation with the RESET/
L.CLR switch (the RUN/STOP/RESET switch in the case of the Basic model QCPU
and Universal model QCPU) is performed or when the power is switched from OFF to
ON.
However, the data in (a) below cannot be cleared by the above operations.
(a) Data that cannot be cleared by reset operation
• Program memory data
• Standard ROM data
• Memory card data
• Latch-specified device data(
(2) in this section)
• File register data
(b) How to clear data that cannot be cleared by reset operation
The data indicated in (a) above can be cleared by the following methods.
1) Program memory data
Clear the data in either of the following methods.
• Check the box and set "Clear program memory" on the Boot file setting
tab of PLC parameter.
Note35
• Clear the program memory on the screen displayed by selecting [Online]
[Delete PLC data] in GX Developer.
2) Standard ROM data
Automatically cleared when data are written to the standard ROM.
3) Memory card data
Clear the data in the memory card on the screen displayed by selecting
[Online] [Delete PLC data] in GX Developer.
4) Latch-specified device data
Refer to (2) in this section.
5) File register data
Reset the data using the RST instruction or transfer K0 using the MOV/FMOV
instruction.
Or, execute "Clear device's whole memory" from the screen displayed by
selecting [Online] [Clear PLC memory] in GX Developer.
Note34
Note35
Basic
Note3.36
The memory card is not available for the Basic model QCPU.
Basic
Basic
Note3.37
The Basic model QCPU cannot set "Clear program memory" on the Boot file setting tab of PLC
parameter.
Basic
Basic
