Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 142)

DeviceLogix 9-19
1503-UM054C-EN-P – June 2013
Figure 9.9 – Timing Diagram for the Counter Function with a Preset Value = 3
Table 9.G – Count Up Timer Valid Data Ranges
Parameters Data Range
PRE 0 ~ 65535
ACC 0 ~ 65535
Up Down Counter
The UP/DOWN counter has three inputs called Input, Reset, and
count down, and one output called output. The counter increments
the accumulator any time the input changes from FALSE to TRUE
and decrements the counter any time the counter down input changes
from FALSE to TRUE. When the accumulator falls below the
preset, the counter resets its output to false. Like the up counter, the
UP/DOWN counter resets when a TRUE level is detected on the
reset input. When a reset occurs, the counter zeroes the accumulator
and sets the output to FALSE