
Chapter 13
Publication
17706.5.16 - 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 nonprivileged
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 (PLC3 only) Used by a PLC3 processor to represent a logical (PLC3 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
PLC2/1774PLC Addressing 13-2
PLC3 Addressing 13-4
PLC5 Addressing 13-9
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