Panasonic FP Series Programming Manual page 835

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Data transfer within the PLC

Using this instruction data will be copied from the data area (DT) to the EEPROM/ Flash-ROM.

The EEPROM memory is not the same as the hold area. The hold area stores data in real time.

Whenever the power shuts down, the hold data is stored in the EEPROM memory. The

P13_EPWT instruction sends data into the EEPROM only when the instruction is executed. It also

has a limitation of the number of times you can write to it (see table below). You must make sure

that the P13_EPWT instruction will not be executed more often than the specified number of writes.

For example, if you execute P13_EPWT with R901A relay (pulse time 0.1s), the EEPROM will

become inoperable after 100,000 * 0.1 sec=10,000 sec (2.8 hours). However if you want to hold

your profile data such as positioning parameters or any other parameter values that are changed

infrequently, you will find this instruction very useful.

Availability of P13_EPWT (see page 1329)

One of the two input variables 's2' or 'd' has to be assigned constant number

EEPROM write to memory

Activation of the function (when EN changes from FALSE to

TRUE, the function will be executed one time)

DT start address of the block(s) that you want to save

Number of blocks to write (1 block = 64 words/ 2048 words

EEPROM start block number

When the function was executed, ENO is set to TRUE.

Helpful at cascading functions with EN-functionality

dec. or hex.