Watlow D4T Data Logger
•
130
•
Chapter 5 Function Reference
On Pulse
This function produces an output pulse of a constant duration. This can be used as a mini-
mum on time for devices that do not tolerate excessive cycling.
To understand the timer’s behavior, consider these scenarios illustrated in the timing diagram
below:
1. When input changes to its active state, the function sets the output to its active state and
begins accumulating the elapsed time. Once the elapsed time reaches the value set for
the Time parameter, the output returns to its in-
active state and the elapsed time resets to zero.
2. The input need not stay active for the output to
remain active for the specified time.
3. However, while the timer is running, if the input
becomes inactive and then active again, the pulse
length is increased.
Note:
The
active
and
inactive
states are user configurable with the parameters described below.
Therefore, the description of the timer’s behavior for its inputs and outputs refers to the
active and inactive states for each rather than on or off. For example, if the input’s ac-
tive state is set to High, the timer starts running (becomes active) when the input changes
from low (off) to high (on). However, if the input’s active state is set to Low, the timer
starts running (becomes active) when the input changes from high (on) to low (off).
Signals
Direction
Label
Type
Function
Receiver
- - - - Digital
Run signal for the timer. The output becomes active and
the timer starts when this input becomes active.
Transmitter - - - - Digital
The output becomes active and the timer starts when the
input becomes active. The output becomes inactive when
specified time has elapsed.
Function
To set the output for a specified time, set Function to
On Pulse
.
Time
Set how long the output is held in its active state once the timer is triggered by the input.
Range: 0 to 99,999.000
Run Active Level
Set which state change at RUN sets the output to its active state and starts the timer.
Options:
• High
: off to on
• Low
: on to off