Siemens SIMATIC S7 F, Manual

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Product Overview
Fail-Safe Systems
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1.5 Software Components
The S7 F Systems have the following software components:
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S7 F Systems (Programming)
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S7 F Configuration Pack (Configuration of the F-I/O’s)
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The fail-safe user program (F user program) on the CPU
The S7 F Systems Optional Package
The S7 F Systems optional package is available for the configuration and
programming of the S7 F System. This gives you:
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Support for the configuration of the F-I/Os with HWCONFIG.
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The "Failsafe Blocks" library for the programming of fail-safe user programs.
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Support for the processing of the F user program and for the integration of fault
detection functions in the F user program.
Fail-Safe User Program
A fail-safe user program is referred to below simply as a Safety Program.
You create Safety Programs with CFC using the fail-safe blocks contained in a
library shipped with the S7 F Systems optional package. The fail-safe blocks
contain fault detection and fault reaction functions, as well as functions for
programming safety functions. In other words, they ensure that failures and faults
are detected and that an appropriate reaction is initiated that will keep the F-
system in a safe state or return it to a safe state.
The user program on the CPU can be made up of safety-related sections (Safety
Program) and not safety-related sections (Standard Program). The Safety Program
is written in separate CFC charts. A combination of F and standard blocks in one
chart is not permissible and is detected during compilation. Data transfers between
the standard and the Safety Program are carried out via conversion blocks.
During compilation, certain fault detection and fault reaction functions are
automatically added to the Safety Program. The S7 F Systems optional package
also provides functions for comparing Safety Programs and supporting the
acceptance of Safety Programs.
Additional Information
You can find detailed information in the following sections.
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Configuration
•
Programming
•
Fail-Safe Blocks
and in the context-sensitive help information.