Mitsubishi A1SD75M1, User Manual

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13 - 5
MELSEC-A
13 COMMON FUNCTIONS
13.3 Execution data backup function
When the AD75 buffer memory data is rewritten from the PLC CPU, "the data backed
up in the AD75 flash ROM" may differ from "the data for which control is being
executed". In cases like these, the data being executed will be lost when the PLC
power is turned OFF. (Refer to Chapter 7.)
In cases like these, the "execution data backup function" backs up the data being
executed by writing it to the flash ROM. The data that was backed up is then written to
the buffer memory when the power is turned ON next.
The execution data is backed up (written to the flash ROM) using one of the following
methods.
•
Method using the sequence program
•
Method using the AD75 software package
"The execution method using the sequence program" is explained in this section.
Refer to the AD75 Software Package Operating Manual for details on the execution
method using the AD75 software package.
The details shown below explain about the "execution data backup function".
(1) Control details
(2) Precautions during control
(3) Backing up the execution data
(1) Control details
The following shows the data that can be written to the flash ROM using the
"execution data backup function".
Buffer memory Flash ROM
Parameters Parameters
Positioning data (No. 1 to No. 100) Positioning data (No. 1 to No. 100)
Positioning start information (No. 7000) Positioning start information (No. 7000)
OS memory
Positioning data (No. 101 to No. 600) Positioning data (No. 101 to No. 600)
Positioning start information
(No. 7000 to 7010) Positioning start information
(No. 7000 to 7010)
(2) Precautions during control
(1) Data can only be written to the flash ROM when the PLC READY signal
(Y1D) is OFF.
(2) Writing to the flash ROM can be executed up to 100,000 times.
(Writing to the flash ROM will become impossible after 100,000 times.)
Important
Do not turn the power ON/OFF; reset the PLC CPU, etc., during parameter writing.
The flash ROM data may be corrupted.