Planning/Configuring
6.6 Configuring the DM-F PROFIsafe and integrating it into the fail-safe automation system using PROFIBUS/
PROFIsafe or PROFINET/PROFIsafe
52
SIMOCODE pro - Fail-Safe Digital Modules
Manual, 11/2017, NEB631679702000/RS-AA/002
Setting of the F-monitoring time
A valid, current safety telegram must be received from the F-CPU within the monitoring time.
This ensures that failures or errors are detected and suitable responses triggered, to enable
the fail-safe system to be set to a safe state.
The specified monitoring time should be sufficiently long for
● On the one hand, telegram delays to be tolerated by the communication system, and
● On the other, for the error reaction function to respond promptly in the event of a fault
(e.g. if the connection is interrupted).
You can find the F-monitoring time under the object properties for the PROFIsafe module:
● in STEP 7 V5.x under parameter "F_WD_Time"
● in STEP 7 (TIA-Portal) under "Parameter → F-monitoring time"
Note
F-monitoring time
Note that the preset F
-monitoring time of 250 ms may need to be adapted.
Further information is available
in the manual SIMATIC Industrial Software Safety Engineering in SIMATIC S7
(http://support.automation.siemens.com/WW/view/en/12490443) in the following
chapters:
– A1 "Configuring monitoring times (SIMATIC Safety - Configuring and Programming)"
– A.3.2 "Minimum monitoring time for safety-related communication between the F-
and the F-I/O (S7 Distributed Safety)"
– A.4.2 "Minimum monitoring time for safety-related communication between the F-
and the F-I/O (S7 F/FH Systems)"
in the manual "SIMATIC Safety - Configuring and Programming" manual
(https://support.industry.siemens.com/cs/ww/en/view/54110126
) in the following chapters:
– A.1.2 "Minimum monitoring time for safety-related communication between the F-
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