Siemens SIMATIC TI555 - Chapter 5 Using an EEPROM or EPROM; Introduction; Program Storage; Using an EEPROM

5-2
Using an EEPROM or EPROM TI545/TI555 System Manual
5.1 Introduction
The CPU offers the option of storing your application program in
non-volatile form. Using Electrically Erasable Programmable Read-Only
Memory (EEPROM), or Erasable Programmable Read-Only Memory
(EPROM [UV -EPROM]), is discussed in the following sections. See T able 5-1
for a description of available EEPROMs and EPROMs.
T able 5-1 Pr ogram Storage Using EEPROM and EPROM
Storage Type Size Order Number
EEPROM 128K bytes 2587681–8022
EEPROM 256K bytes 2587681–8030
EPROM 128K bytes 2587681–8023
EPROM 256K bytes 2587681–8031
After your EEPROM has been programmed, it is portable; that is, it can be
used in any other TI545–1 102 or TI555 controller .
If you install an EEPROM, the CPU allows you to save your current
program without using a separate EEPROM programming device. The
program can be downloaded directly from RAM to a 128K byte or 256K byte
EEPROM by using Auxiliary Function 84. Complete instructions on storing
a program using an EEPROM appear later in this chapter. Refer to
T able 5-2 for EEPROM compatibility .
T able 5-2 EEPROM/EPROM Portability Between Contr ollers
Controller/Firmware Release Can Use EEPROM/EPROM From:
TI545–1102* or TI555 with
Firmware Release 3.0 or later.
TI545, TI555 with any firmware release.
TI555 with Release 1.1.2. or earlier.
TI545–1101 with any firmware release.
TI555 with Release 1.1.2 or earlier.
Note: * Due to the inclusion of password-related information in the (E)EPROM,
an EEPROM generated by Release 3.0 or later on the TI545–1102 or TI555 cannot
be used in the TI545–1101. If you require an (E)EPROM for use on the both the
TI545–1
101 and the TI545–1 102 (TI555), create the EEPROM on the TI545–1101.
Program Storage
Using an EEPROM