Siemens SINUMERIK MC Commissioning Manual page 78

Safety program of the F-PLC
3.8 F-runtime groups
③
Runtime group parameters
1. The F-CPU monitors the F-cycle time of the F-runtime group. Two parameters are available
to do this.
– If the "Warning limit cycle time of the F-runtime group" is exceeded, then an entry is
– If the "Maximum cycle time of the F-runtime group" is exceeded, then the F-CPU goes
Note
The call interval of the F-runtime group is monitored against a maximum value; this means
it is monitored as to whether the call is performed frequently enough, but not whether too
frequently or e.g. isochronously. Therefore, failsafe times must be implemented using
instructions TP, TON or TOF from the task card "Instructions" and not using a counter (OB
calls).
Note
The response time of your safety function is also dependent on the cycle time of the F-OB,
the runtime of the F-runtime group - and when using distributed F-I/O - the parameterization
of PROFINET. As a consequence, the configuration/parameterization of the standard
system also influences the response time of your safety function.
If you do not prevent changes being made to the configuration/parameterization of the
standard system that can influence the response time by applying the appropriate
organizational measures, when calculating the maximum response time of the safety
function, you must always apply the monitoring times.
You must parameterize the "Warning limit cycle time of the F-runtime group" lower or the
same as the "Maximum cycle time of the F-runtime group".
2. Under "F-runtime group information DB" assign a name for the F-runtime group information
DB.
④
Creating new F-runtime groups
Using this command, you can create a second F-runtime group; for example, to organize safety-
relevant program sections that are executed quickly, in their own dedicated F-runtime group.
⑤
Delete F-runtime group
This command deletes the assignment of the F blocks to an F-runtime group. You may have to
carry out additional steps if you wish to delete your safety program.
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written to the diagnostics buffer of the F-CPU. You can use these parameters to define
whether the cycle time can exceed a specified value without the F-CPU going into the
stop state.
into the stop state. For "Maximum cycle time of the F-runtime group", select the
maximum time that can elapse between two calls of this F-runtime group (max.
20000000 μs).
Safety Integrated (with SINAMICS S120)
Commissioning Manual, 02/2020, A5E46305916B AB