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6
FUNCTIONS
6.4 PLC memory initialization
(1) What PLC memory initialization is
This selects execution of PLC
memory initialization with GX
Developer.
Execute PLC
memory initialization
QSCPU
GX Developer
(2) Contents of PLC memory initialization processing
Program memory
Standard ROM
CPU access password
Safety CPU operation mode Enters TEST MODE.
Operation
Clock data
ROM write count
PLC memory initialization erases user data written in the CPU module.
When you initialize the PLC memory, data is returned to its factory settings.
After PLC memory initialization is executed, the system automatically resets
cancels the reset, then the initialization processing is executed again.
The QSCPU initializes the program memory, standard
ROM, CPU access password, the operation error
history, and the clock data.
Program
memory
Standard ROM Erase data
CPU access
password
Operation and
error history
Clock data
QSCP
*: OP005:SYSTEM INITIALIZE PLC MEMORY is recorded in the operation error history.
Diagram 6.9 PLC memory initialization operation overview
Table6.8 shows the contents of PLC memory initialization processing.
Table6.8 Contents of PLC memory initialization processing
Item
The data is erased.(State in which not even one file exists)
The data is erased.(State in which not even one file exists)
Not registered
/
After the history is erased, the following operation/error history is
error history
recorded.
• OP005: SYSTEM INITIALIZE PLC MEMORY
• OP100: POWER ON
• 2200: MISSING PARAMETER
Initializes to 2005/01/01 00:00:00.
2 is added
The QSCPU automatically
resets
Erase data
OP100:POWER ON
2200:MISSING PARAMETER
Set to no
password
After initialization to 0
incidents, record the
operation history*
Initialize to
2005/1/1 00.00.00
Contents of initialization processing
6.4 PLC memory initialization
and cancels the reset.
Reset
QSCPU
reset cancel
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