Watlow LogicPro - Manual (Page 139)

LogicPro User’s Guide Chapter 10: Function Blocks
Doc.# 28002-00 Rev 3.00 Watlow Anafaze 123
Figure 10.6 Relationship between the Input
and Output of TP Function Block
Timer On-Delay (TON)
The Timer On-Delay function block, shown in Figure 10.7,
provides a time delay for enabling an event at a preset time
interval.
Upon a True condition of the enable bit (INP), TON increments
the integer elapsed time (ET) value in thousandths of a second
until the integer preset time (PT) value is reached. Once the
elapsed time value equals the preset time value, the output bit
(Q) is enabled and remains enabled until the enable bit
becomes False. The elapsed time value resets to and remains
at zero as long as the enable bit is False.
Figure 10.7 Timer On-Delay Function Block
Inputs
INP is the Timer On-Delay 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. After this delay, the output bit is enabled as long
as the enable bit remains True. 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.
INP
ET
Q