Siemens SIMATIC S7-1200 Programmazione della sicurezza Manualline - Pagina 21

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Siemens SIMATIC S7-1200 Programmazione della sicurezza Manualline

3 Methods for Safety Programming

3.3

Functional identifiers of variables

Safety often uses the terms 'shutdown' or 'shutdown signals'. In practice, a safety

function is described using this terminology:

"When a safety door is opened, drive XY must be safely shut down."

However, release signals are generally programmed in the technical

implementation as a safety program. This is due to the fact that safety

interconnections are designed based on the closed-circuit principle.

If, for example, a safety door is closed, it gives the enable to switch on a safe

actuator.

Recommendation

Before the start of the project, define a uniform name of the variables with the

appropriate suffixes. The identifier reflects the meaning and purpose of the

variables in the source code context.

Choose the variable identifier such that it reflects the logic "1" state ("true").

For example, "maintDoorEnable" or "conveyorSafetyRelease".

Note

The standardized names of the drive functions (e.g., STO and SLS) according to

IEC 61800-5-2 do not comply with the above recommendation.

Safety Programming Guideline

Entry ID: 109750255,

V1.0,

10/2017