Addressing Reference
SLC 500 Family of Programmable Controllers
17
The recommended default file for counter structures is file 5 of the data
table. This file accommodates up to 256 counter structures. If your
application requires more than 256 counter structures, specify one or more
files (10 – 255) in the user-defined area of the data table in addition to
file 5.
Each counter structure consists of three words. You can address a counter
structure in its entirety or you can address any particular member of a
structure individually.
Figure 17
Logical
Addressing for Counter Structures
File Type
C = Counter
Member Mnemonic*
See Table N
Structure Number
0 – 255 decimal
Logical Address Identifier
File Separator
Member Mnemonic Separator*
$ C 5 : 123 .ACC
File Number
5 or
10 – 255 decimal
*Required only if addressing to the member level.
Figure 18
Bit Map of the Counter Structure
1514131211109876543 2 10
CU RESERVED
PRE
Word 0
Word 1
Word 2
ACC
CD DN OV UN RESERVED
UA
1
Logical Addressing for
Counter Structures
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