Siemens SIMATIC S7-1200 Programmation de la sécurité Manualline - Page 18

Parcourez en ligne ou téléchargez le pdf Programmation de la sécurité Manualline pour {nom_de_la_catégorie} Siemens SIMATIC S7-1200. Siemens SIMATIC S7-1200 48 pages. Controlling several fans (ebm-papst) via modbus rtu
Également pour Siemens SIMATIC S7-1200 : Manuel (30 pages), Manuel d'utilisation (36 pages), Manuel (40 pages), Manuel (17 pages), Manuel (31 pages), Manuel (49 pages), Manuel (20 pages)

Imprimer la page
Siemens SIMATIC S7-1200 Programmation de la sécurité Manualline
3 Methods for Safety Programming
3.1.4

F-suitable PLC data type

For safety programs, too, it is possible to optimally structure data using PLC data
types.
F-suitable PLC data types have the following features:
F-suitable PLC data types are declared and used in the same way as PLC data
types.
All data types that are allowed in the safety program can be used in F-suitable
PLC data types.
Nesting F-suitable PLC data types within other F-suitable PLC data types is not
supported.
F-suitable PLC data types can be used both in the safety program and in the
standard user program.
Recommendation
Create F-suitable PLC data types to structure data also in the safety program.
Use F-suitable PLC data types to transfer large numbers of variables to blocks.
Use F-suitable PLC data types for access to I/O ranges.
In this context, follow the below rules:
–
The structure of the tags of the F-suitable PLC data type must match the
channel structure of the F-I/O.
–
Example of an F-suitable PLC data type for an F-I/O with 8 channels:
–
Access to F-I/O is only allowed for activated channels. When configuring a
1oo2 evaluation, the higher-level channel is always deactivated.
Advantages
A change in a PLC data type is automatically updated in all points of use in the
user program.
Safety Programming Guideline
Entry ID: 109750255,
V1.0,
8 BOOL variables (channel value) or
16 BOOL variables (channel value + value status)
10/2017
18