GE 90-30 PLC Series Installation And Hardware Manual page 120

Procedure for Creating an EPROM
1.
2.
3.
4.
5.
Note:
EEPROM and EPROM devices, listed in the following table, are available from GE.
Table 5-2. EPROM and EEPROM Catalog Numbers
IC693ACC305 (Qty 4)
IC693ACC306 (Qty 4)
Flash Memory
The Model 340, 341 (later versions), 350, 351, 352, 360, 363, 364, and 374 CPUs have Flash
memory for user program storage. (Note that versions of the Model 341 CPU prior to firmware
release 4.61 had EEPROM memory.) The Read/Write/Verify process for user programs is the
same for Flash memory as it is for EEPROM operations. Flash memory operations (Read, Write,
or Verify) are accessed from the Program Utilities Function menu or from another Program
Utilities screen in the Logicmaster 90-30/20/Micro programming software.
GFK-0356Q Chapter 5 CPUs
Install an EEPROM in the PROM socket of the PLC you will use to develop the application
program.
Develop and debug the program in RAM memory, then write it to the EEPROM.
Remove the EEPROM from the PLC and install it in the EPROM burner as a master to make
one or more EPROMs.
Install the blank EPROM in the EPROM burner and copy the program on the EEPROM to the
blank EPROM.
Install the EPROM in the PLC's PROM socket, then copy its contents into RAM memory.
The EPROM then serves as an on-board backup to RAM memory.
Your CPU can be configured to load the application program stored in the PROM device
automatically into RAM memory when the CPU is powered-up. See "Running Without a
Memory Backup Battery" in Chapter 6 for details.
If PROM is configured (on the CPU configuration screen) as the power-up
program source and a PROM device is not present in the PROM socket, or a
blank PROM is in the socket, on a power-up cycle, a blank program will be
copied into the CPU's RAM memory and the program in RAM memory will
be lost. Always keep a backup copy of your current program files in case of
an emergency.
Catalog Number Description
28C256 EEPROM, 350ns
32Kx8 UV EPROM, 150ns
Caution
GE
Part Number Vendor Part Number
44A725999-000 XICOR X28C256P
XICOR X28C256P25
XICOR X28HC256P-15
44A723379-000 NEC
Atmel
Toshiba TC57256AD-15
Hitachi HN27C256AG-15
AMD
Intel
5
Third Party Source
PD27C256AD-15
AT27C256-15DC1
AM27C256-150DC
TD27C256A-1
5-9