S5-95F Differences Between the S5-95U and the S5-95F
16.3 Program Scanning
16.3.1 Cyclic Program Scanning
• Due to additional failsafe functions, the S5-95F operating system's runtime is greater than that
of the S5-95U's operating system, and is typically 50 ms.
• In addition to the permanent hardware-inherent cycle monitoring time, the S5-95F has a second,
specifiable cycle monitoring time.
16.3.2 Time-Controlled Program Scanning
The dynamic behaviour of time-controlled program scanning differs from that of the S5-95U (see
section 7.4.3).
16.3.3 Interrupt-Driven Program Scanning
• OB2 for hardware interrupts (limited operation set due to asynchronous user program execution
and short response time)
• OB3 for software interrupts (edge detection via operating system)
• Additional diagnostic byte for interrupt processing (see Chapter 12)
16.4 S5-95F Operating Modes
There are three operating modes:
• Test mode
• Safety mode
• Quasi-safety mode
The restart characteristics are different for each mode (see section 2.5.2).
EWA 4NEB 812 6210-02
16-3
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