Logical Addressing For Counter Structures - Allen-Bradley SLC 500 Reference Manual

Logical Addressing for
Counter Structures
15 14 13
Word 0
CU CD DN
Word 1
Word 2
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

Logical Address Identifier
File Number
File Type
5 or
C = Counter
10 – 255 decimal
Figure 18
Bit Map of the Counter Structure
12 11 10 9
1
UA
OV UN RESERVED
SLC 500 Family of Programmable Controllers
Addressing Reference
File Separator
Member Mnemonic Separator*
$ C 5 : 123 .ACC
Structure Number
0 – 255 decimal
*Required only if addressing to the member level.
8 7 6 5 4
PRE
ACC
Member Mnemonic*
See Table N
3 2 1 0
RESERVED
17