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7-5
Using EEPROMs for Program Storage
SIMATIC 545/555/575 System Manual
You can manage operation of EEPROMs by using SoftShop (select the menu
command PLC Utilities PLC Operations) or TISOFT AUX 84 on your
programming unit. Your programming package allows you to do the
following procedures:
Copy RAM to EEPROM.
Copy EEPROM to RAM.
Select RAM as program source.
Select EEPROM as program source.
Erase the program in EEPROM.
Report source (RAM OR EEPROM) of program being executed.
When you power up your system, the CPU checks the status of the
(E)EPROM and the battery. A clear (un-programmed) (E)EPROM is
equivalent to having no (E)EPROM installed. Table 7-3 lists mode and
memory status (after powerup) that result from various battery and
(E)EPROM conditions.
Table 7-3 Mode and Memory Status after Powerup
Conditions Results
Battery
Status
Programmed (E)EPROM
and Program Source =
EEPROM
CPU
Memory
CPU
Mode
Bad or Off No Cleared PROGRAM
Bad or Off Yes
Cleared, then loaded
with program that is
in (E)EPROM
RUN
Good and On No No change
Mode prior to
power loss
Good and On Yes (same program) No change
Mode prior to
power loss
Good and On Yes (different program)
Cleared, then loaded
with program that is
in (E)EPROM
RUN
Program Storage
Operations
Memory and Mode
Status at Powerup
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