Product overview
3.4 Functions
CPU 1505SP (F) Ready4Linux Version 2.7
Operating Instructions, 05/2019, A5E46864285-AA
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3.4.8 Fail-safe
Areas of application
The F-CPU is mainly designed for personal and machine protection and burner controls. In
addition to the safety program, you can also program standard applications.
You can operate the F-CPU in safety mode or in standard mode.
Information on using the F-CPU in safety mode is available in the programming and
operating manual "SIMATIC Safety - Configuring and Programming
(https://support.automation.siemens.com/WW/view/en/54110126)".
You can find additional information on the F-CPU in the Product Information for F-CPUs
(https://support.industry.siemens.com/cs/document/109478599/simatic-s7-1200-s7-1500-f-
cpus?dti=0&lc=en-WW).
When you load a project with fail-safe functionality to the CPU, it is shown on the web server.
Web server
On the start page, the Web server displays the following under "General:"
● The version of
STEP 7 Safety
with which the safety program was compiled.
On the start page, the web server displays the following under "Fail-safe:"
● Safety mode activated/deactivated
● Collective F-signature
● Last fail-safe change
On the "Module information" web page, the following is displayed under "Details" of the
respective fail-safe I/O in the "Safety" tab:
● F-parameter signature (with address)
● Safety mode
● F-monitoring time
● F-source address
● F-destination address
Write access to F-blocks is not permitted.
-safe inputs/outputs can result in an F-CPU STOP.
You can find additional information about the "Web server" topic in the Web Server Function
Manual (https://support.automation.siemens.com/WW/view/en/59193560).
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