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Siemens SIMATIC S7-1200 Sicherheitsprogrammierung Manualline

3 Methods for Safety Programming

3.9

Data exchange between standard user program and

safety program

The safety program's task is to execute all the functions that represent a risk-

reducing action. All other operational functions and functions for operation and

maintenance are part of the standard user program.

In practice, information for the diagnostic and signaling concept is also generated

in the safety program and operational information is also relevant to the safety

program. As a result, it is not possible to completely separate both program parts.

In order to move non-safety-related functions to the standard user program, you

have to define an interface. Global data blocks are best suited for this purpose.

Recommendation

Use global standard data blocks to exchange data between the standard user

program and the safety program.

To ensure a good overview of which program part reads and which one writes, it is

recommended to create two data blocks for the two directions.

You should not store any other information (e.g., diagnostic data from the standard

user program) in the data blocks as each modification of the data block involves a

modification of the safety program.

Figure 3-10: Data exchange between standard user program and safety program

Safety Programming Guideline

Entry ID: 109750255,

V1.0,

10/2017