Siemens SIMATIC S7-1200 Programmazione della sicurezza Manualline - Pagina 18

Sfoglia online o scarica il pdf Programmazione della sicurezza Manualline per Interruttore Siemens SIMATIC S7-1200. Siemens SIMATIC S7-1200 48. Controlling several fans (ebm-papst) via modbus rtu
Anche per Siemens SIMATIC S7-1200: Manuale (30 pagine), Manuale di istruzioni per l'uso (36 pagine), Manuale (40 pagine), Manuale (17 pagine), Manuale (31 pagine), Manuale (49 pagine), Manuale (20 pagine)

Stampa la pagina
Siemens SIMATIC S7-1200 Programmazione della sicurezza 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