Mitsubishi 00JCPU User Manual page 359

(5) PLC RAS(2)
Parameters required for performing the RAS functions in the Process CPU and Redundant CPU are set.
Parameter
Item
No.
Check
Memory
Program 3008
check
memory
When checking all areas in the program memory, the number of steps to be checked can be calculated by the following
procedure.
• On the Read from PLC screen, check the size of total free area in the program memory.
Before checking the size, confirm that the program memory is formatted and no file is written in the memory.
(
• Calculate the number of steps with the following expression.
Note2
High
Note8.2
performance
The High Performance model QCPU does not support the memory check function.
When using the memory check function in the Process CPU, check the versions of the CPU module and GX
Developer. (
Note2
Note8.2
Figure 8.16 PLC RAS(2)
Table8.16 PLC RAS(2) setting list
Description
Set whether to check the user area
in the program memory (excluding
system areas) for data corruption.
H
Enter the number of steps to be
checked when "Check Program
memory" is selected.
Section 5.2.2)
Number of steps to be
checked
Process
Appendix 2.3)
Setting range
Selected/deselected
Q12PHCPU and Q12PRHCPU:
1 to 496 points (256 to 124K steps)
Q25PHCPU and Q25PRHCPU:
1 to 1008 points (256 to 252K steps)
Total free area size
(bytes)
4
CHAPTER8 PARAMETERS
Refer-
Default
ence
Deselected
Section
6.27
1 256 step
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