Rockwell Automation 1747-DTAM-E,D17476.1 Data Table Access Module (DTAM) - Manual (Page 102)

B-6 SLC 500 Data Files and Logical Addressing
Publication 1747-6.1
Data File 4 - Timers
Timers 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 timer addresses as follows:
Format Explanation
Tf:e
T Timer
f File number.
Number 4 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: T4:0 Element 0, timer file 4.
Address bits and words by using the format TF:e.s/b where Tf:e is explained above, and
. is the word delimiter
s indicates subelement
/ is the bit delimiter
b indicates bit
T4:0/15
T4:0/14
T4:0/13
T4:0.1
T4:0.2
T4:0.1/0
T4:0.2/0
Enable bit
Timer timing bit
Done bit
Preset value of the timer
Accumulated value of the timer
Bit 0 of the preset value
Bit 0 of the accumulated value
EN
14
TT DN
12 7 6 5
nternal se
15 13 11 10 9
Preset alue PRE
8
Accumulated alue ACC
4
0
0
1
2
Word 3 2 1
Timer Element
Addressable Bits Addressable Words
r
o
r
d
d r r o ddr