Chapter 4
Data File Organization and Addressing
4–10
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 accumulated value. This is illustrated
below:
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
0
1
2
Word
Preset Value PRE
Accumulated Value ACC
Counter Element
Addressable Bits
Addressable Words
CU = Count up enable
CD = Count down enable
DN = Done bit
PRE = Preset
ACC = Accum
CU CD DN
Internal Use
OV UN UA
OV = Overflow bit
UN = Underflow bit
UA = Update accum. value
(HSC in fixed controller only)
Bits labeled “Internal Use” are not addressable.
Assign counter addresses as follows:
Format
Explanation
C
Counter
Cf:e
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 3word elements. See
figure above.
Example:
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
Count up enable bit
C5:0/14
Count down enable bit
C5:0/13
Done bit
C5:0/12
Overflow bit
C5:0/11
Underflow bit
C5:0/10
Update accum. bit (HSC in fixed controller only)
C5:0.1
or
C5:0.PRE
Preset value of the counter
C5:0.2
or
C5:0.ACC
Accumulated value of the counter
C5:0.1/0
Bit 0 of the preset value
C5:0.2/0
Bit 0 of the accumulated value
