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7-2

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

7.1 Program Storage Options

You can download your program into a non-volatile, read-only memory chip

for additional program security. Program storage options include portable

Electrically Erasable Programmable Read-Only Memory (EEPROM) or

Erasable Programmable Read-Only Memory (UV-erasable EPROM) chips

and permanent on-board EEPROMs.

The CPUs listed in Table 7-1 provide on-board, permanent, non-volatile

flash EEPROM memory for program storage. The program memory storage

capacities for each CPU are also listed.

The 575–2105 and 575–2106 CPUs provide only on-board program storage.

Table 7-1 Program Storage Capacities

CPU Model User Memory in RAM On-Board User Memory Capacity

545–1105 96 Kbytes 96 Kbytes

545–1106 192 Kbytes 192 Kbytes

555–1105 384 Kbytes 384 Kbytes

555–1106 1856 Kbytes 1790 Kbytes

575–2105 832 Kbytes 832 Kbytes

575–2106 1856 Kbytes 1790 Kbytes

All 545 and 555 CPUs offer the option of storing your application program

in non-volatile form, by means of portable dual in-line pin (DIP) EEPROM

or EPROM chips. (The 575 CPUs do not support this option.)

Table 7-2 lists the (E)EPROMS available for use with 545/555 CPUs.

Table 7-2 Program Storage Using (E)EPROM

Storage Type ROM Size Program Size Order Number

EEPROM 128 Kbytes 126 Kbytes 2587681–8022

EEPROM 256 Kbytes 254 Kbytes 2587681–8030

EPROM* 128 Kbytes 126 Kbytes 2587681–8023

EPROM* 256 Kbytes 254 Kbytes 2587681–8031

*The EPROM chips cannot be programmed on the CPU. You must use an EPROM copier to

copy your progam from an EEPROM to the EPROM chip.

Overview

On-Board Flash

EEPROM Program

Storage

Optional Portable

(E)EPROM Program

Storage

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