Publication 1785-IN022C-EN-P - September 2005
Firmware Update Instructions for Ethernet, Enhanced and ControlNet PLC-5 Programmable Controllers 23
On the Enhanced PLC-5 Programmable Controllers, Series A thru D: Do this:
1785-L40B, -L46B, -L60B, -L80B and -L86B programmable controllers 1. Remove the four screws that hold the right
side plastic
cover.
2. Remove the cover and remove the
communication cards.
3. Remove the two large screws and washers
located in the middle of the exposed circuit
board.
4. Separate the two processor boards by
pulling the exposed circuit board at the
backplane edge connector away from the
metal cover as you would open a book.
5. Notice the direction in which the battery
cable is wrapped around the nearby standoff.
6. Disconnect the wires leading from the
battery to the stake pins on the exposed
circuit board.
7. Disconnect the wires leading from the
keyswitch to the stake pins on the exposed
circuit board.
8. Remove both communication cards.
9. Remove and replace the firmware EPROMS
one at a time, taking note of the location
number and the orientation of the notch in
each of the EPROMS.
10. See the figure to the left for the numbers
and locations of the EPROMS.
11. Reassemble the controller by reversing
steps 1 thru 8.
* EPROM numbers may vary and their locations shown in these illustrations are approximate. Your series and revision of controller and firmware may be different. Make certain the EPROM numbers
from your firmware update match the numbers on their respective circuit boards and communication cards.
U5*
U31*
U12*
Replace the U5 and
Replace the U12 EPROM on the circuit
on the circuit board*
PLC-5 Chassis
Replace the firmware EPROM on the chassis
U7*
Replace the U7 or U12 EPROM
the chassis communication
card
board communication card*
on
(if applicable)*
circuit board (if applicable)*
U31 EPROMS
Allen-Bradley Motors
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