Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 219)

13–4 PLC Addressing
Publication 1770Ć6.5.16 - October 1996
PLC-3 family controllers support logical, physical, and symbolic
addressing.
For information on See page
logical addressing 13-5
physical addressing 13-7
symbolic addressing 13-8
Important: PLC-3 processors can accept and transmit
PLC-2/1774-PLC command messages with the
PLC-2/1774-PLC logical addressing format.
Before sending a PLC-2/1774-PLC command to a
PLC-3 node, you must first allocate a PLC-3 input file
with the same file number as the PLC-2/1774-PLC’s
octal node address on the network. This file helps the
PLC-3 to simulate PLC-2/1774-PLC memory. Data is
read from or written to this file number.
Transmitting commands from PLC-3 processors
To transmit commands from a PLC-3 processor to your computer,
set up a computer buffer to simulate a PLC-3 file and write computer
application programs that are capable of interpreting all the types of
addressing formats that appear in the command messages.
PLCĆ3 Addressing
"