Rockwell Automation 1775-KA PLC-3 Communication Adapter Module User Manual - Manual (Page 57)

Chapter
4
4Ć1
Addressing Rules and Examples
This chapter presents some general rules for specifying data addresses in
message procedures. This chapter assumes that you are already familiar
with the forms and meanings of addresses in the PLC–3 and other
Allen–Bradley programmable controllers. For details on these subjects,
refer to the appropriate documentation listed in Table 4.A.
Table 4.A
Memory Organization Documentation
Controller Document Publication
Number
(Old/New No.)
PLC-3 PLC-3 Programming Manual 1775-801/1775-6.4.1
PLC PLC Programming & Operations Manuals 1774-800/1774-6.8.1
PLC-2 PLC-2 Memory Organization and Structure 1772-907/---------
PLC-2/30 PLC-2/30 Memory Organization 1772-914/1772-4.4
PLC-2/20 Memory Organization of PLC-2.20 Controller 1772-909/1772-4.3
PLC-2/15 PLC-2/15 Memory Organization 1772-912/---------
PLC-4 PLC-4 Microtrol Product Guide 1773-800/1773-6.5.1
In this chapter,the addressing formats are presented in shorthand notation.
The notation used is as follows:
<bit>
-
the number of a particular bit within the
addressed word
<fileaddr>
-
the logical address of a PLC–3 file
<filesym>
-
a symbolic address of a PLC–3 file
<offset>
-
the number of words between the
beginning of the file and the desired word
(offset is zero for the first word of a file)
<size>
-
number of words of data to be transferred
<wordaddr>
-
the logical address of a PLC–3 word
<wordsym>
-
a symbolic address of a PLC–3 word
General