Programming; Overview; Structure Of The Safety Program - Siemens SIMATIC S7 F Manual

5

Programming

5.1

Overview

5.1.1

Structure of the Safety Program

The following figure illustrates the structure of a Safety Program in the
programming device/ES and CPU schematically:
STEP 7 project
Hardware
CFC
Standard
F-System
F User's
The user program in the CPU is usually made up of a standard and a fail-safe
section. The safety functions are programmed in CFC using fail-safe blocks.
Fail-Safe Systems
A5E00085588-03
Programming device / ES
Failsafe Blocks V1_2
Control Blocks
Simulation Blocks
User Blocks
Charts
Libraries
S7 F System
User
Safety
Program
Standard
Program
F-SMs
Standard
SMs
5-1