Software section
3.2 Creating the program
S7-1500
52 Getting Started, 05/2014, A5E03981761-AC
Cyclic interrupt OB
3.2.4.1
Cyclic interrupt OB – Cycle time and phase
Cycle time and phase offset can be changed
Main [OB35] is located below the program blocks inserted into the project. Main [OB35] is a
cyclic interrupt organization block (cyclic interrupt OB). Cyclic interrupt OBs serve to start
programs in periodic time intervals independently of the cyclic program execution. The start
times of a cyclic interrupt OB are specified using the cycle time and the phase offset.
The cycle time determines the interval at which an OB is called. The cyclic interrupt OB has
a cycle time of 100000 μs by default.
The phase offset is used to increase the accuracy of the processing intervals of cyclic
interrupt programs. If an OB has the same or a common multiple clock pulse of another OB,
both can be operated at a precise interval by a phase offset.
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