Chapter 5 Using An Eeprom Or Eprom; Introduction; Program Storage; Using An Eeprom - Siemens SIMATIC TI555 System Manual

5.1

Introduction

Program Storage

Using an EEPROM

Using an EEPROM or EPROM
5-2
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 Table 5-1
for a description of available EEPROMs and EPROMs.

Table 5-1 Program Storage Using EEPROM and EPROM

Storage Type
EEPROM
EEPROM
EPROM
EPROM
After your EEPROM has been programmed, it is portable; that is, it can be
used in any other TI545–1102 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
Table 5-2 for EEPROM compatibility.

Table 5-2 EEPROM/EPROM Portability Between Controllers

Controller / Firmware Release
TI545–1102* or TI555 with
Firmware Release 3.0 or later.
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
TI545–1101 and the TI545–1102 (TI555), create the EEPROM on the TI545–1101.
Size
128K bytes
256K bytes
128K bytes
256K bytes
Can Use EEPROM / EPROM From:
TI545, TI555 with any firmware release.
TI545–1101 with any firmware release.
TI555 with Release 1.1.2 or earlier.
TI545/TI555 System Manual
Order Number
2587681–8022
2587681–8030
2587681–8023
2587681–8031