Siemens SIMATIC S7 System Manual page 277

Hide thumbs Also See for SIMATIC S7:

Table of Contents

Data types for the parameters

Parameter and type

Time parameter examples:

● If the CYCLE time = 100 us, then the interrupt OB referenced by OB_NR interrupts the

● If the CYCLE time = 0, then the interrupt event is deactivated and the interrupt OB is not

● The PHASE (phase shift) time is a specified delay time that occurs before the CYCLE

If lower and higher priority OBs are called in the same time interval, the lower priority OB is

only called after the higher priority OB has finished processing. The execution start time for

the low priority OB can shift depending on the processing time of higher priority OBs.

If you want to start the execution of a lower priority OB on a fixed time cycle, then phase shift

time should be greater then the processing time of higher priority OBs.

S7-1200 Programmable controller

System Manual, 11/2011, A5E02486680-05

cyclic program scan every 100 us. The interrupt OB executes and then returns execution

control to the program scan, at the point of interruption.

time interval begins. You can use the phase shift to control the execution timing of lower

priority OBs.

101BExtended instructions

OB number (accepts symbolic name)

Time interval, in microseconds

Phase shift, in microseconds

Execution condition code

8.4 Interrupts

Show Quick Links

Table of Contents

Simatic s7-1200