EasyManuals Logo

Siemens SIMATIC S7 F User Manual

Siemens SIMATIC S7 F
354 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Page #66 background imageLoading...
Page #66 background image
Safety Mechanisms
Fail-Safe Systems
3-10 A5E00085588-03
3.9.1 Communication Between the Safety Program and the Standard
User Program
The standard and Safety Programs use different data formats. Special conversion
blocks must therefore be used for the data exchange.
F-CPU
Standard program
Safety Program
Non-safety-related
From To Block Safety-
Related
Safety Program Standard program F_Fdata type_data type No
Standard program Safety Program F_data type_Fdata type No
The following data types are supported: BOOL, REAL, INT and TIME.
Parameters are passed as safety-related F-data types in the Safety Program. If the
standard user program has to process data from the Safety Program, for
monitoring purposes, for example, then a block for the conversion of data (F_Fdata
type_data type) must be inserted in CFC to convert the F-data types to standard
data types.
These blocks can be found in the Failsafe Blocks, User Blocks library.
The F_Fdata type_data type blocks must be called in the standard user program
(CFC chart, standard run-time group).
If data from the standard user program has to be processed in the Safety Program,
safety-related F-data types must be created from the standard data types using
F_data type_Fdata type blocks for data conversion and, if necessary, then
subjected to a plausibility check programmed using fail-safe blocks. The F_data
type_Fdata type data conversion blocks must only be used in the Safety Program
(CFC chart, F-run-time group).
See Also
Programming Communication Between F User Programs and Standard User
Programs

Table of Contents

Questions and Answers:

Question and Answer IconNeed help?

Do you have a question about the Siemens SIMATIC S7 F and is the answer not in the manual?

Siemens SIMATIC S7 F Specifications

General IconGeneral
BrandSiemens
ModelSIMATIC S7 F
CategoryController
LanguageEnglish

Related product manuals