Siemens Simatic S7 Series Manual page 55

SIMATIC Retentive On-Delay The.SIMATIC Retentive On-Delay Timer (TONR) functions.in.
Timer (TONR).
a.similar.manner.to.the.On-Delay.Timer.(TON)..Just.like.the.On-
Delay.timer.(TON),.the.Retentive.On-Delay.Timer.(TONR).times.
when.the.enabling.input.(IN).is.on..However,.the.Retentive.On-
Delay.Timer.(TONR).does.not.reset.when.the.input.(IN).turns.off..
Instead,.the.timer.must.be.reset.with.a.Reset.(R).instruction.
The.following.example.shows.a.Retentive.On-Delay.timer.
(TONR).with.a.resolution.of.00.ms.and.preset.value.of.50.(5.
seconds)..When.input.I0.3.turns.on,.I0.3.contact.closes,.and.
timer.T5.begins.timing..If,.for.example,.after.0.seconds.input.
I0.3.turns.off,.the.timer.stops..When.input.I0.3.turns.on.again,.
the.timer.begins.timing.at.0.seconds..Timer.bit.T5.turns.on.5.
seconds.after.input.I0.3.closes.for.the.second.time..When.timer.
bit.T5.turns.on,.contact.T5.closes,.and.output.Q0..turns.on.
The.Reset.(R).function,.shown.in.network.,.is.necessary.to.
reset.the.accumulated.time.of.the.Retentive.On-delay.Timer.
(TONR).to.zero..In.this.example,.the.Reset.(R).function.turns.on.
and.resets.the.timer.when.contact.I0.2.closes..This.causes.the.
T5.contact.to.open.and.output.Q0..to.turn.off.
Network 1
I0.2
Network 2
I0.3
Network 3
T5
54
T5
R
T5
TONR
IN
100 ms
+150 PT
Q0.1