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Siemens SIMATIC S7-1200 Veiligheidsprogrammering Manualline

2 Configuring Fail-Safe Controllers

The following figure shows the influence of the safety program's cycle time on the

time that is available for processing the standard user program.

Figure 2-2: Influence of the safety program's cycle time on the standard user program

Note

Please note that higher-priority organization blocks (e.g., cyclic interrupt OBs or

motion control OBs) can interrupt the safety program in the same way as shown

in Figure 2-2.

To make sure that the safety program cannot be interrupted, you can customize

the priorities in the properties of the appropriate OBs.

NOTICE

The cycle time must be longer than the execution duration of the safety program.

Safety Programming Guideline

Entry ID: 109750255,

V1.0,

10/2017