Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 141)

9-18 DeviceLogix
1503-UM054C-EN-P – June 2013
output remains TRUE, and the accumulator is cleared, essentially
ignoring the input.
If the timer senses a true level on the reset input at any time during
the operation of the timer, it resets the output to false and clears the
accumulator. Because the reset line is level sensitive, the timer
remains reset until the timer detects a false on the reset input. Also,
because the input is level sensitive, the timer will again begin to
increment the accumulator if the reset line goes FALSE while the
input remains FALSE. However, because the reset logic already set
the output to FALSE, the time delay causes no effect because the
output is already FALSE. If the input is TRUE when the reset goes
FALSE, the timer sets the output to true.
Figure 9.8 – Timing Diagram for the Off-Delay Timer
Table 9.F – Off Delay Timer Valid Data Ranges
Parameters Data Range
PRE 0 ~ 65535
ACC 0 ~ 65535
Time Base 0 (1 ms), 1 (10 ms)
Up Counter
The up counter has two inputs called input and reset and out output
called output. The up counter simply counts up on a FALSE to
TRUE transition and sets its output to TRUE when the accumulator
reaches the present value. The accumulator continues to count up
until the counter is reset or it reaches 65,535. A TRUE value on the
reset input zeroes the accumulator and sets the output to FALSE.