Response Times - Siemens SINAMICS S120 Function Manual

8.4

Response times

The Safety Integrated Basic Functions are executed in the monitoring cycle (p9780).
PROFIsafe telegrams are evaluated in the PROFIsafe scan cycle, which corresponds to
twice the monitoring clock cycle (PROFIsafe scan cycle = 2 · r9780).
Note
Actual value of the monitoring cycle (r9780)
You can only see the actual value of the monitoring cycle (r9780) if you are connected
ONLINE with the drive. However, you can use the following values to roughly calculate the
response times:
• If P0115[0] = 31.25 µs or 62.5 µs or 125 µs, then r9780 = 4 ms.
• If p0115[0] = 250 µs, then r9780 = 8 ms.
• If p0115[0] = 400 µs or 500 µs, then r9780 = 16 ms.
Note for understanding the tables
The drive system is the component that provides the safety functions. The designation "fault-
free drive system" means that the component that provides the safety functions does not
have a defect itself:
● Worst case for a fault-free drive system
For faults outside the drive system (e.g. faulty setpoint input from a control system, limit
value violations as a result of the behavior of the motor, closed-loop control, load, etc.),
the "Worst case for a fault-free drive system" response time is guaranteed.
● Worst case when a fault exists
For a single fault within the drive system (e.g. a defect in a switch-off signal path of the
power unit, in an encoder actual value measurement, in a microprocessor (Control Unit or
Motor Module) etc.), the "Worst case when a fault exists" response time is guaranteed.
Safety Integrated
Function Manual, 12/2018, 6SL3097-5AR00-0BP1
System features
8.4 Response times
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