Watlow LogicPro - Manual (Page 138)

Chapter 10: Function Blocks LogicPro User’s Guide
122 Watlow Anafaze Doc.# 28002-00 Rev 3.00
Inputs
INP is the Timer Pulse enable bit. A True condition of this bit
triggers the elapsed time to start incrementing in thousandths
of a second until the elapsed time equals the preset time. In a
program using Ladder logic, the value of INP is determined by
the Boolean evaluation of elements placed between the left
power rail and INP in the function block. In
FBD programs, the
value of INP is determined by the Variable connected to INP.
If no contacts are placed on the rung before INP, the value of
INP is always True.
PT is the Timer Pulse preset time. In Ladder logic, assign this
input a symbolic name or constant value in the
Assign
Function Block Symbolic Input/Output dialog box. In
FBD , assign a variable to this input in the Variable
Assignment dialog box. The range of values this Variable
can assume is from 1 to 32,767 for INT type Variables and 1
to 2,147,483,647 for LONG type Variables thousandths of a
second. If this Variable is assigned a value out of these ranges,
unpredictable results will occur.
Outputs
Q is the Timer Pulse output bit. This bit is enabled and passes
power when the elapsed time is less than the preset time and
is still incrementing.
ET is the Timer Pulse elapsed time. In ladder logic, this
Variable may be assigned a symbolic name in the
Assign
Function Block Symbolic Input/Output dialog box. In
FBD, assign a variable to this output in the Variable
Assignment dialog box. The value of this Variable
increments in thousandths of a second when triggered by a
True condition of the enable bit until the elapsed time is equal
to the preset time. The elapsed time retains this value until the
enable bit is False. If the enable bit becomes False before the
elapsed time equals the preset time, the elapsed time continues
to increment, but resets to zero as soon as it reaches the preset
value.
Figure 10.6 on page 123 illustrates the relationship between
the inputs and outputs of the TP function block and shows how
the INP signal and ET (timer) determine the state of the output
Q. INP and Q signals are high or low, the ET is an analog value
on the vertical axis. Time is on the horizontal axis.