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Using EEPROMs for Program Storage SIMATIC 545/555/575 System Manual

7.4 Editing a Program Stored in an EEPROM

You can edit the program and data stored in an EEPROM by following the

steps listed below.

NOTE: If necessary, refer to your SIMATIC 505 TISOFT2 User Manual for

detailed instructions about executing TISOFT AUX functions.

1. Set the CPU to PROGRAM mode.

2. Using your programming unit and the TISOFT auxiliary function

AUX 84 option, select EEPROM as the program source. This will copy

the EEPROM program to RAM.

WARNING

When you select EEPROM, the CPU is cleared and then loaded with the

contents of the EEPROM. This clears V-memory and resets all timers, counters,

drums, etc.

Therefore, selecting EEPROM could cause unexpected operation when the CPU

is switched back to RUN mode, which could cause death or serious injury to

personnel, and/or damage to equipment.

If you have to edit a program stored in EEPROM, be sure to re-enter all correct

variables and other settings to memory as required by your process before

going back to RUN mode.

3. Select RAM as the program source.

4. Edit the program source code (in RAM memory) as required.

5. Select the TISOFT auxiliary function AUX 84 in your programming

unit.

6. Use the Erase option to erase program data on the EEPROM.

7. Use the Copy option to copy the program from RAM to the EEPROM.

8. Select the EEPROM as the program source.

Although the CPU can copy a program from either an EEPROM or an

EPROM into RAM, the CPU cannot copy a program from RAM to an

EPROM.

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Siemens SIMATIC TI500 Especificaciones Pagina 212