EPROM/EEPROM OPERA
TION
4-4
Hardware
and Installation User Manual
4.2 INSTALLING AN EPROM/EEPROM IN TI525 MODELS
Before
beginning installation, you must disable power
to the PLC. If you intend
to
download a program in RAM memory to an EEPROM, you should ensure that
a
good battery is installed and
enabled, or the program may be lost when power
is
restored. Follow the steps listed below
.
1.
Place the PLC in PROGRAM MODE.
NOTE
The PLC mode (RUN or PROGRAM) on power-up
depends
upon mode at power
-down, the condition of
the battery, and the presence or absence of an
EPROM/EEPROM.
Refer to T
able 4-1.
2. Turn
off all user
-supplied power to the PLC base.
3. Remove
the PLC from the base assembly
.
4. Ensure
that switch 1 on the second dipswitch (DIP 2) is turned ON.
This
enables
battery backup.
NOTE
If the battery backup is disabled and you take
longer than 10 minutes to install the
EPROM/EEPROM, you may lose the program
stored
in RAM.
5.
Refer to
Figure 4-1. If you are installing an EPROM, place jumpers on
pins 2–3 and 4–5. If you are installing an EEPROM, place jumpers on
pins
1–2 and 3–4.
6. Insert the EPROM/EEPROM, aligning the notches on the
EPROM/EEPROM
and the socket.
7. Check the pins to make sure that they are all seated properly in the
socket.
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