Safety Engineering in SIMATIC S7
System Manual, 04/2006, A5E00109529-05
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Monitoring and Response Times of F-Systems
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Introduction
Overview
This chapter provides the following information for S7 Distributed Safety and
S7 F/FH Systems:
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F-related monitoring times that must be configured
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Rules to be followed when specifying monitoring times
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Formulas to be used when calculating F-specific minimum monitoring times and where to
find the necessary time information
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Location where F-related monitoring times are to be entered
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Rules to be followed with calculating the maximum response time of a safety function
Support for Calculations
To assist you in approximating the F-specific minimum monitoring times and maximum
response times for your F-system, Microsoft Excel files are available for each F-system as
follows:
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For S7 Distributed Safety an Excel calculation file is available in the Internet at:
http://support.automation.siemens.com/WW/view/en/11669702/133100
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For S7 F/FH Systems: in
...\Siemens\STEP7\S7BIN\S7ftimeb.xls directory
Additional Information
The monitoring and response times for the standard portion are calculated in S7 Distributed
Safety and S7 F/FH Systems in exactly the same way as for standard S7-300 and S7-400
automation systems and are not addressed here. For a description of this calculation, refer
to the hardware manuals for the CPUs.
