Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers - Manual (Page 114)

Preface MicroLogix 1000 Programmable Controllers User Manual
6–16
Entering Parameters
Accumulator Value (ACC)
This is the number of false-to-true transitions that have occurred since the counter
was last reset.
Preset Value (PRE)
Specifies the value which the counter must reach before the controller sets the done
bit. When the accumulator value becomes equal to or greater than the preset value,
the done status bit is set. You can use this bit to control an output device.
Preset and accumulated values for counters range from –32,768 to +32,767, and are
stored as signed integers. Negative values are stored in two’s complement form.
Addressing Structure
Address bits and words using the format Cf:e.s/b
Format Explanation
C Counter file
f File number. The only valid file number is 5.
: Element delimiter
Cf:e
e
Element
number Ranges from 0 – 39. These are 3-word elements. See figure
on page 6–15.
Cf:e
.
Word
element
s subelement
/ Delimiter
b bit
Note If assigned to a high-speed counter instruction, C5:0 is not available as an address
for any other counter instructions. For more information on high-speed counter
instructions, see chapter 12.