Siemens SINAMICS S120, Function Manual

Page: 693 / 1094

Safety Integrated Basic Functions
10.7 Response times
Drive functions
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
693
10.7 Response times
The 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:
p0115[0] = 31.25 µs or 62.5 µs or 125 µs r9780 = 4 ms
p0115[0] = 250 µs r9780 = 8 ms
p0115[0] = 400 µs or 500 µs 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, such as 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, such as a defect in a switch-off signal path of
the power unit, a defect in an encoder actual value measurement, a defect in a
microprocessor (Control Unit or Motor Module) etc., the "Worst case when a fault exists"
response time is guaranteed.