Siemens Simatic S7 Series Manual page 57

IEC 1131-3 Timers It.is.not.the.intent.of.this.course.to.cover.all.S7-200.instructions,.
but.timer.instructions.provide.an.opportunity.to.understand.
some.of.the.differences.between.the.SIMATIC.and.IEC.3-3.
instruction.sets.
The.timers.previously.discussed.were.SIMATIC.timers..
The.IEC 1131-3 instruction set.also.includes.three.timers,.
On-Delay Timer (TON),.Off-Delay Timer (TOF),.and.Pulse
Timer (TP)..The.same.three.resolutions.(.ms,.0,.ms,.and.00.
ms).are.available.as.for.the.SIMATIC.timers,.and.the.resolution.
is.determined.by.the.timer.number.as.shown.in.the.following.
illustration.
%Txxx
IN
PT
xxx ms
On-Delay Timer
Resolution
(1 ms, 10 ms, 100 ms)
T33 to T36, T97 to T100
T37 to T63, T101 to T255
The.On-Delay.Timer.(TON).begins.timing.when.its.enable.input.
(IN).turns.on..When.the.elapsed.time.(ET).equals.the.preset.
time.(PT),.the.timer.stops.timing,.and.the.output.(Q).turns.on..
The.timer.is.reset,.when.IN.turns.off.
The.Off-Delay.Timer.(TOF).output.(Q).turns.on.immediately.
when.IN.turns.on..When.IN.turns.off,.the.timer.begins.timing..
When.ET.equals.PT,.Q.turns.off..The.elapsed.time.is.maintained.
until.the.next.time.IN.turns.on..If.IN.turns.on.before.ET.equals.
PT,.Q.remains.on.
The.Pulse.Timer.(TP).generates.pulses.of.a.preset.duration..
When.IN.turns.on,.Q.turns.on,.and.the.timer.begins.timing..
When.ET.equals.PT,.Q.turns.off..The.elapsed.time.is.maintained.
until.IN.turns.off.
IEC 1131-3 Timers
Timer Number (T0 to T255)
%Txxx
TON IN
Q
PT
ET
xxx ms
Off-Delay Timer
Elapsed
Time
Timer Number Resolution Maximum Value
T32, T96 1 ms
10 ms
100 ms
56
%Txxx
TOF IN
Q
PT
ET
xxx ms
Pulse Timer
32.767 seconds
327.67 seconds
3276.7 seconds
TP
Q
ET