Rockwell Automation 1503VC IntelliVAC Plus Contactor Control Module - Manual (Page 139)

9-16 DeviceLogix
1503-UM054C-EN-P – June 2013
timer resets the output to FALSE the pulse timer can again trigger
the process by sensing a FALSE to TRUE transition on the input pin.
Even if the input remains on the entire time the accumulator is
counting, when the accumulator reaches the preset value the timer
resets the output to FALSE. At any point during the operation of the
timer, if it detects a TRUE level on the Reset input it will disable the
timer and set the output to FALSE. The timer must again be
triggered by a FALSE to TRUE transition on the input. This means
that if the input is TRUE and the Timer is reset the timer will remain
inactive. Even if the reset changes back to FALSE while the INPUT
is TRUE, the timer remains inactive. In order to start a new pulse
operation, the input must change to FALSE then back to TRUE.
Figure 9.6 – Timing diagram for the Pulse Timer
Table 9.D – Pulse Time Valid Data Ranges
Parameters Data Range
PRE 0 ~ 65535
ACC 0 ~ 65535
Time Base 0 (1 ms), 1 (10 ms)
On Delay Timer
The on delay timer delays the output response to an input by a
desired amount of time. When the input is TRUE, the timer
increments the accumulator and when the inputs goes FALSE the
timer resets the accumulator. For each timebase unit of time, the
timer increments the accumulator. When the Accumulator reaches
the preset value, the timer sets the output to TRUE. The timer
maintains the output TRUE as long as the input remains TRUE.
When the input changes from TRUE to FALSE, the timer resets both
the output and the accumulator. If the input goes false before the
time period specified by the timebase and preset, the output remains
FALSE and the accumulator is cleared, essentially ignoring the
input.