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7-4

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

Program Storage Options (continued)

The EEPROM stores the following elements of the user program:

• Relay ladder logic (RLL)

• K-memory

• U-memory

• S-memory (PID loops, analog alarms, and SF programs)

• Memory configuration

• I/O configuration

• Password, if installed

• Scan configuration

NOTE: The current values for timer, counter, and drum presets (TCP, DSP,

and DCP) are not copied to the EEPROM. You must ensure that your RLL

program has the preset values that you desire for TCP, DSP, and DCP

before you save your program to the EEPROM. When your program is

restored from the EEPROM, preset values for TCP, DSP, and DCP are

restored from the program’s RLL instructions.

Values stored in V-memory are not copied to EEPROM. Any operational

constants that are to be retained following restoration from EEPROM must

be kept in K-memory or as part of the RLL program. V-memory is initialized

to zero when the program is restored from EEPROM.

After storage in the EEPROM, this data is saved even if power is cycled

without a back-up battery. However, other data in memory (e.g., V-memory)

will be lost if you do not have a back-up battery.

NOTE: To help ensure that the data listed above is saved, the total user

memory space to be stored in the EEPROM must not exceed the EEPROM

capacity, depending on EEPROM model (see Table 7-2). If the total user

memory (not system memory) space occupied by these areas is greater than

the EEPROM capacity, no data is saved. The error message OPERATION

FAILED is displayed on the screen if the user memory exceeds the applicable

size when attempting to save the data.

What is Stored in

Non-Volatile

Memory

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