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SEQUENCE PROGRAM EXECUTION
3.6 Data Clear Processing
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3.6 Data Clear Processing
This section explains how to clear CPU module data
(1) Data clear methods
There are the following six ways to clear CPU module data.
(a) Reset with the RUN/STOP/RESET switch, GX Developer.
(b) Restarting the PLC System
(c) PLC memory clear using GX Developer
(d) PLC memory format using GX Developer
(e) PLC memory initialization using GX Developer
(f) History clear using GX Developer (operation and error history clear)
(2) Data That Can and Cannot Be Cleared with Each Data Clearing Method.
Table3.2 shows which data can and cannot be cleared by the methods shown in (1)
(a) to (f).
: Data cleared : Data not cleared
* 1 : When the program memory is copied into ROM using GX Developer, the standard ROM data is
first cleared, then the program memory is written into standard ROM
* 2 : When PLC memory initialization is executed, the safety CPU operation mode becomes TEST MODE.
* 3 : After the history is erased, the following PLC memory initialization operation and error history is
recorded.
• OP005 : FSYSTEM INITIALIZE PLC MEMORY
• OP100 : POWER ON
• 2200 : MISSING PARAMETER
* 4 : After the operation and error history is erased, the following operation history is recorded.
• OP200 : CLEAR OPERATION/ERROR LOG
Remark
For details on GX Developer operation methods, refer to the following manual.
GX Developer Version 8 Operating Manual
GX Developer Version 8 Operating manual (Safety PLC)
Table3.2 That Can and Cannot Be Cleared with Each Data Clearing Method
Data item
Data clear methods
Reset
operation
Power restart
PLC memory
clear
PLC memory
format
PLC memory
initialization Clear history
Program memory
data
Standard ROM
data*1
Device data
Safety CPU
operation mode
*2
CPU access
password
Clock data
Operation and error
history
*3
*4
ROM write count
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