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3
SEQUENCE PROGRAM EXECUTION
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 item
Program memory
data
Standard ROM
data*1
Device data
Safety CPU
operation mode
CPU access
password
Clock data
Operation and error
history
ROM write count
Remark
Table3.2 That Can and Cannot Be Cleared with Each Data Clearing Method
Reset
Power restart
operation
* 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
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)
Data clear methods
PLC memory
PLC memory
clear
format
3.6 Data Clear Processing
PLC memory
Clear history
initialization
*2
*3
*4
: Data cleared
: Data not cleared
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