S5-95F Design, Functions and Operation
2.5.2 Operating Modes
The S5-95F distinguishes between three operating modes:
• Test mode
• Quasi-safety mode
• Safety mode
Safety Note
Whenever the process controller executes safety functions, the S5-95F must operate in
the "safety mode". The "test mode" and "quasi-safety mode" are for the exclusive
purpose of testing the user program.
Self-Test during STARTUP
High-grade self-tests for most of the components are integrated in the operating system of the
S5-95F; for all other components, at least one standard self-test is provided. The duration of the
total self-test routine is approx. 90 s. It is executed as a whole only during STARTUP.
Self-Test during Cyclic Operation
For reasons of time, the S5-95F executes only a small part of the self-test routine at a time during
cyclic operation. That is why the self-test routine is divided into several test slices. At the end of
cyclic program execution, the S5-95F automatically executes one or several of these test slices. The
whole self-test routine is thus executed once within one hour.
EWA 4NEB 812 6210-02
2-13
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