Download Display - Service, Support

5.3
Installing EEPROMs and EPROMs
Follow instructions in this section to install an EEPROM or EPROM in your
CPU.
NOTE: If you are installing an EEPROM and intend to download a program
(from RAM memory), ensure that the good back-up battery is fully charged
and enabled. Controller power must be turned off and, without a
functioning back-up battery, your program may be lost when power is
restored.
!
CAUTION
1.
Place the CPU in PROGRAM Mode. You may want to use TISOFT AUX
60 (SAVE PLC ALL) to save program to disk before proceeding.
2.
Ensure that switch 9 on the CPU dipswitch is turned On (to the left).
This enables backup battery.
3.
Turn off all user-supplied power to the TI545/TI555 base.
Electrostatic discharge can damage the CPU.
Personnel must make contact with a grounded conductive pad
and/or wear a grounded wrist strap when handling the CPU.
5-6
4.
Remove the CPU from the base assembly and place component-side up
on a non-conductive surface.
5.
Insert the EEPROM (EPROM), aligning the notches on the EEPROM
(EPROM) and the socket (Figure 5-1).
6.
Check the pins to make sure that they are all seated properly in the
socket.
7.
Observe Jumper E18. If you intend to write to the EEPROM, ensure
that Jumper E18 is strapped. If you do not write to the EEPROM and
want to disable this feature, remove strap E18.
8.
Re-install the CPU in the base and turn the base power On. Refer to
the Troubleshooting chapter if the EEPROM (EPROM) fails to function
correctly.
Using an EEPROM or EPROM
TI545/TI555 System Manual