F-TM ServoDrive
Equipment Manual, 02/2020, A5E47579503-AA
102
A.1 Response times
Introduction
Below you can find the response time of the F-TM ServoDrive in STEP7. The response
times of the F-TM ServoDrive are included in the calculation of the response time of the
F-system.
The drive system is the component that provides the safety functions.
Definition of response time
The response time is the time between the detection of an input signal and the change of a
linked output signal.
Definition of process safety time of a process
The process safety time of a process is the time between the occurrence of an error within
which a process can be left unattended without risk to life and limb of the operating
personnel or damage to the environment and the time of the completed reaction.
Any type of F-system control is tolerated within this process safety time, i.e. the F-system
can control its processes incorrectly or even not at all. The process safety time of a process
depends on the type of process and must be determined on a case-by-case basis.
Check that the process safety time of the process is not exceeded. You may need to reduce
the specific monitoring times of the F-system.
Fluctuation width
The actual response time falls between a minimum and maximum response time. You must
always assume the maximum response time when configuring your system.
Definition of maximum response time in an error-free scenario (worst case delay time, WCDT)
In the event of errors outside the drive system (e.g. incorrect setpoint setting by a controller,
limit violations due to behavior of the motor, closed-loop control, load, etc.), the "maximum
response time in an error-free scenario" is guaranteed.
Definition of maximum response time when an error is present (one fault delay time, OFDT)
In the event of a single error within the drive system (e.g. defect in a shutdown path of the
power unit), the "maximum reaction time in the event of error" is guaranteed.
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