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3.35
Program Cache Memory Auto Recovery Function
This function is to restore the error location automatically by using data in the program memory, which are stored in the
flash ROM, when the memory check function ( Page 199, Section 3.34) detects an error in the program cache
memory. This function enables the CPU module to continue its operation even if an error such as change of data in the
program cache memory occurs due to noise.
Remark
Before executing this function, check the version of the CPU module used. ( Page 376, Appendix 2)
(1) Execution condition
The function is executed when the following conditions are all met.
• The CPU module is in RUN status.
• Data in the program memory match those in the program cache memory.
Note that the function is not executed in the following conditions and RAM ERROR (error code: 1160) is detected
even though the above conditions are met:
• The change of data in the program cache memory was detected while the following operations were being
performed with the CPU module during RUN.
Online change (ladder mode)
Password registration (program files)
Program memory batch download
Export to ROM format
Write to PLC (device comments)
: The auto recovery processing is performed and no error occurs. : An error occurs depending on the condition. : An error occurs.
*1
If the change of data is detected while data in the program cache memory are being transferred to the program memory
(while the following window is being displayed on the programming tool), the auto recovery processing is not performed
and an error occurs.
• The change of data in the program cache memory was detected by SFC program.
• The change of data in the program cache memory was detected by the dedicated instruction such as the
S(P). instruction.
• The change of data in the program cache memory was detected by the rise instruction or the fall instruction.
• The data in the program cache memory was not restored due to the failure of the memory.
200
Operation item
LCPU with a serial number (first five digits) of "13102" or
later
*1
*1
*1
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