EEPROM Memory Module
Product Data
6
You can download the program stored in any EEPROM module into
processor memory using the following steps. Refer to installation, removal,
and EEPROM programming procedures for details.
1.
Turn off all power to the I/O chassis and processor.
2.
Remove the processor from the I/O chassis.
3.
Remove the back-up EEPROM module from the processor.
4.
Insert the other EEPROM module into the processor.
5.
Check that the processor’s back-up lithium battery is installed and its
expiration date has not passed.
6.
Set switch 6 of the switch assembly group on the I/O chassis
backplane to the OFF position. This allows the processor to
unconditionally load its memory with EEPROM contents.
7.
Insert the processor into the I/O chassis.
8.
Turn on power to the 1771-LSP processor, or to the 1771-P3, -P4, -P5
power supply when using the 1772-LS processor.
Program transfer and execution begin immediately.
9.
If applicable, set switch 6 of the switch assembly group on the I/O
chassis backplane to its original setting, and/or transfer the new
program to back-up EEPROM.
Use switches 6 and 7 of the switch group assembly on the I/O chassis
backplane to select the mode of memory transfer at power-up.
If Switch 6 Is
And Switch 7 Is
Then EEPROM Contents
Off
On
On
Either position
On
Off
Always transfers to CMOS RAM.
Does not transfer if CMOS RAM
is valid
Transfers if CMOS RAM is invalid
Never transfers to CMOS RAM
EEPROM Downloading
Backplane Switch Settings