Rockwell Automation 1770, D17706.5.16 Ref Mnl DF1 Protocol Command - Manual (Page 216)

Chapter
13
Publication 1770Ć6.5.16 - October 1996
PLC Addressing
PLC processors support these types of addressing:
Type of Addressing Description
logical Type of addressing that a PLC processor uses in its ladder
diagram program to access its own data table memory.
This is the same type of addressing you use in nonĆprivileged
commands (that is, in commands that access only PLC data
table memory).
physical Type of addressing a computer uses to send a privileged
command to a PLC node. In particular, you use physical
addressing to upload or download PLC memory.
symbolic (PLCĆ3 only) Used by a PLCĆ3 processor to represent a logical (PLCĆ3 only)
address with ASCII characters.
This chapter explains the types of addressing a computer can use in
command messages that it transmits to these processors. It contains
these sections:
Section Page
PLCĆ2/1774ĆPLC Addressing 13-2
PLCĆ3 Addressing 13-4
PLCĆ5 Addressing 13-9