Siemens S7-1200 System Manual page 215

Operation of the timers
Table 7- 22 Types of IEC timers
Timer
TP: Gernerate pulse
The TP timer generates a pulse with a preset width
time.
TON: Generate ON-delay
The TON timer sets output Q to ON after a preset time
delay.
TOF: Generate OFF-delay
The TOF timer resets output Q to OFF after a preset
time delay.
TONR: Time accumulator
The TONR timer sets output Q to ON after a preset time
delay. Elapsed time is accumulated over multiple timing
periods until the R input is used to reset the elapsed
time.
S7-1200 Programmable controller
System Manual, 03/2014, A5E02486680-AG
Timing diagram
Basic instructions
7.2 Timer operations
215