Product Overview
Fail-Safe Systems
A5E00085588-03
1-19
1.7 Working with F-Systems
This section describes the basic procedure for working with fail-safe systems. Only
those steps that are relevant to F-Systems and differ from the standard procedure
are included.
Planning the System
Process-dependent planning tasks such as defining a piping and instrumentation
diagram, creating a flowchart, creating a measuring point list, defining a structure,
etc. are not described here. When you plan the system, specify the required safety
functions with the corresponding Safety Integrity Levels (SILs). From these, derive
the demands on the components in order to implement the safety functions (PLCs,
sensors, actuators). These decisions affect other tasks such as hardware
installation, configuration, and programming.
!
Safety Note – Keep Safety and Standard Functions Separate
It is important to separate standard (e.g. not safety-related) and safety (e.g. safety-
related) functions rigorously during planning.
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