Siemens SIMATIC S7-1200 Programmazione della sicurezza Manualline - Pagina 45

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Siemens SIMATIC S7-1200 Programmazione della sicurezza Manualline

5 Glossary

Glossary

Coded processing

To meet the normative requirements in terms of redundancy and diversity, all

SIMATIC F-CPUs use the "coded processing" principle. In coded processing, the

safety program is processed twice by a single processor.

To this end, the compiler generates a diverse (encoded) safety program that is

referred to as the protection program.

The first program run processes the unmodified safety program of the user. After

that, the protection program is processed. Then the F-CPU compares the results. If

processed correctly, the safe outputs are written. If there are differences between

the two program parts (e.g., due to data corruption), the F-CPU goes to stop and

generates an entry in the diagnostic buffer.

Figure 5-1: Safety program processing sequence

Main Safety

(F-CALL)

Zeit

Data corruption

Data corruption means that data of the safety program has been tampered with by

external influences (e.g., EMC influences) or illegal write access.

F-CPU

An F-CPU is a controller suitable for safety-related tasks.

PROFIsafe

PROFIsafe is a protocol for fail-safe communication via PROFINET.

Cross-circuit

Cross-circuit detection is a diagnostic function of an evaluation unit that detects

short-circuits or cross-circuits between two input channels (sensor circuits).

A cross-circuit can be caused, for example, by a squashed light plastic-sheathed

cable. Without cross-circuit detection, this would result in, for example, a two-

channel emergency stop circuit not tripping even though only one normally closed

contact is faulty (secondary error).

Safety Programming Guideline

Entry ID: 109750255,

V1.0,

F-PAE lesen (F_CTRL_1)

Sicherheitsprogramm bearbeiten

Absicherungsprogramm bearbeiten

Ergebnisse vergleichen

F-PAA schreiben (F_CTRL_2)

10/2017

F-Ablaufgruppe