Allen-Bradley ControlNet PLC-5 - Page 22

Publication 1785-IN022C-EN-P - September 2005
22 Firmware Update Instructions for Ethernet, Enhanced and ControlNet PLC-5 Programmable Controllers
Step 2 - Install the New Firmware EPROMS
1. Disassemble the controller to begin the EPROM replacement:
On the Enhanced PLC-5 Programmable Controllers, Series A thru D: Do this:
1785--L11B, -L20B and -L26B programmable controllers 1. Remove the four screws that hold the right
side plastic
cover.
2. Remove the cover.
3. Remove the two large screws and washers
located in the center of the exposed circuit
board.
4. Carefully 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. 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.
6. See the figure to the left for the numbers
and locations of the EPROMS.
7. Reassemble the controller by reversing
steps 1 thru 4.
On the Enhanced PLC-5 Programmable Controllers, Series A thru D: Do this:
1785-L30B programmable controller 1. On the front of the controller, remove the 2
hex nuts on Channel 0.
2. Remove the screw on the communication
card and remove the card.
3. Remove the four screws that hold the right
side plastic
cover and remove the cover.
4. Remove the two large screws and washers
located in the center of the exposed circuit
board.
5. Carefully 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.
6. Gently pull the communication card off of
the circuit board.
7. 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.
8. See the figure to the left for the numbers
and locations of the EPROMS.
9. Reassemble the controller by reversing
steps 1 thru 6.
* 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.
U18* (if applicable)
U61*
U70*
Replace the
U61 and U70
EPROMS*
If applicable,
replace the U18
EPROM*
U5*
U31*
U7 or U12
Replace the
U5 and U31
EPROMS on the
circuit board*
If applicable, replace
the U7 or U12 EPROM
on the
Remove communication card
(if applicable)
communication card*