Watlow D4T Data Logger
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Chapter 5 Function Reference
2. If the input is not active when the user sets the time, the output becomes active, but the
timer does not run. When the input becomes active, the output remains active until the
timer counts down to zero. If the input becomes inactive at any point while the timer is
running, the output remains active and the Time and Elapsed Time hold until the input
becomes active again at which point the timer resumes running.
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
RUN
Digital
Run signal for the timer. The timer runs when this input is
active and holds when this input is inactive.
Transmitter - - - - Digital
Active whenever the time is greater than zero
Note:
The elapsed time is not retained through a power loss; it is set to zero upon power up.
Function
To trigger the output by setting the time, to have the timer count down while the input is ac-
tive, and have the output active until the time runs out, set Function to
One Shot
.
Time
Set the amount of time to count down. While the input is active this parameter counts down
until it reaches zero. The output is active whenever this parameter is greater than zero.
Range: 0 to 99,999.000
Run Active Level
Set in which state at RUN the timer counts down.
Options:
• High
: on
• Low
: off
Note:
The time is not retained through a power loss; it is set to zero upon power up.
Transmitter Active Level
Set the state of the output that indicates the timer is running or holding with a Time setting
greater than zero.
Options:
• High
: On
• Low
: Off