Rockwell Automation 1785-LTx INST.INSTR CLASSIC PLC-5 - Manual (Page 3)

Classic PLC-5 Programmable Controller Firmware Upgrade 3
Publication1785-5.12 May 1998
Remove the screw from under the plastic cover.
3
8
Being careful not to damage the interboard connector pins, separate the
two printed circuit boards. 4
5
Replace the firmware PROMs in locations U32, U33, and U38. Observe the
pin 1 locater and make certain that no pins are bent under.
U32
U33 U38 U41
Observe Pin 1 and Notch
when inserting.
ZILOG Z08613 PROTOPACK ZILOG Z08611 MASK ROM DEVICE
20664–M
ZILOG
xxxxxxxxx
xxxxxx
9313
6
7
If your processor has a protopack device in location U41, replace it with
the masked ROM device included with this update kit. If U41 is already a
masked ROM, and the date code on that part is 9242 or earlier, replace it. If
U41 is a maked ROM with a date code of 9243 or later, skip this step.
Reassemble the processor observing the cautions described on the front page
of these instructions.
Reload the customer program and make sure that it runs properly.
date code
date code