Siemens Simatic S7 Series

Program instructions
7.17 Timer
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
339
Since the timer can be started anywhere within a 100-ms interval, the preset must be set to
one time interval greater than the minimum desired timer interval. For example, to guarantee
a timed interval of at least 2100 ms using a 100-ms timer, the preset time value should be
set to 22.
TON On-delay timer example
LAD
STL
100 ms timer T37 times out after 1 s
(10 x 100 ms)
• I0.0 ON = T37 enabled,
• I0.0 OFF = disable and reset T37
Network 1
LD I0.0
TON T37, +10
T37 bit is controlled by timer T37
Network 2
LD T37
= Q0.0
Timing Diagram