Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 103)

SLC 500 Data Files and Logical Addressing B-7
Publication 1747-6.1
Data File 5 - Counters
Counters are 3-word elements. Word 0 is the control word, word 1
stores the preset value, and word 2 stores the accumulator value. This
is illustrated below.
Assign counter addresses as follows:
Format Explanation
Cf:e
C Counter
f File number.
Number 5 is the default file. A file
number between 10-255 can be used if
additional storage is required.
: Element delimiter
e
Element
number Ranges from 0 to 255. These are 3-word
elements. See the figure above.
Examples: C5:0 Element 0, counter file 5.
Address bits and words by using the format CF:e.s/b where Cf:e is explained above, and
. is the word delimiter
s indicates subelement
/ is the bit delimiter
b indicates bit
C5:0/15
C5:0/14
C5:0/13
C5:0/12
C5:0/11
C5:0/10
C5:0.1
C5:0.2
C5:0.1/0
C5:0.2/0
Count Up Enable
Count Down Enable
Done bit
Overflow bit
Underflow bit
Update accumulator bit (HSC only)
Preset value of the counter
Accumulated value of the counter
Bit 0 of the preset value
Bit 0 of the accumulated value
CU CD
14
DN
12
O UN UA
7 6 5
nternal Use
15 13 11 10 9
Preset alue PRE
8
Accumulated alue ACC
4
0
0
1
2
Word 3 2 1
Counter Element
Addressable Bits Addressable Words
o
o do
o
ro
dro
d or
o
r
d
d r
r o ddr