Timer instructions
326
Part II IEC Instructions
TON
Timer with switch-on delay
To add an enable input and enable output to the instruction, select [With EN/ENO] from the
"Instructions" pane (LD, FBD or IL editor). To reuse an instruction select "Recently used" from the
context menu or press <Ctrl>+<Shift>+<v> in the programming window.
For TON declare the following:
IN timer ON
an internal timer is started for each rising edge detected at IN
PT switch-on delay
(16-bit value: 0 - 327.27s, 32-bit value: 0 - 21,474,836.47s; resolution 10ms
each) the switch-on delay is defined here (PT = preset time)
Q signal output
is set if PT = ET
ET elapsed time
indicates the current value of the elapsed time
Time
chart
NI
Q
ET
PT
t
0
t
1
t
2
t
3
t
t
00
+ PT t
1
t
2
t
3
t
0
t
1
t
2
t3
t
1 2
1
Q is set delayed with the time defined in PT. Resetting is without any delay.
2
If the input IN is only set for the period of the delay time PT or even for a shorter period of time
(t3 - t2 < PT), Q will not be set.
PLC types Availability of TON (see page 1332)
Description
The function block TON allows you to program a switch-on delay.
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