EPROM/EEPROM OPERA
TION
4-6
Hardware
and Installation User Manual
4.3 INSTALLING AN EPROM/EEPROM IN TI535 MODELS
If you are powering up a TI535 for the first time you should initialize it before
proceeding with the EPROM/EEPROM installation. Refer to the startup
procedure
in Chapter 5.
T
o install the EPROM/EEPROM, follow these steps.
1.
Using the programming unit, 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. Ensure
that the Battery Good LED is on. If it is not, turn on switch 1 on
DIP 2. This enables battery backup. If the Battery Good LED remains
off, replace the battery before continuing with the EPROM/EEPROM
installation.
NOTE
If you power down the TI535 while the BATT
GOOD
LED is off, you may lose the program stored
in
RAM.
3. Turn
off all user
-supplied power to the PLC base.
4. Remove
the PLC from the base.
5. 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.
Refer
to Figure 4-2.
6. The EPROM/EEPROM socket is a zero insertion force socket, and no
pressure is required to insert the 28-pin EPROM/EEPROM. Use a
small,
flat-blade screwdriver to open the socket. T
urn the screw on the
socket counterclockwise one quarter turn until the socket pins have
opened.
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