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Functions
9.8 Safety Integrated (for S200 PTI only)
9.8.8
Response time
Technical data
The following response time is applicable to the stop function control via the STO terminal. The
response time of the stop function is the time between the selection of the stop function and the
initiation of a stop response. The monitoring cycle (p9500) is 4 ms.
The specified response time is applicable to a fault-free drive system as well as when a fault is
active in the system.
Table 9-41
Function
STO
9.8.9
Functional safety
Overview
A system or machine is considered functionally safe if the safety-relevant parts of the protection
and control equipment function correctly.
Description of function
Safety, from the perspective of the object to be protected, cannot be split-up. The causes of
danger and therefore also the technical measures to prevent them can vary widely. This is the
reason that a distinction is made between various safety types (e.g. by specifying the cause of
potential hazards). "Functional safety" is involved if safety depends on the correct function.
To ensure the functional safety of a system or machine, the safety-related parts of the
protection and control devices must function correctly. In the case of a fault, systems must
respond in such a way that either the plant remains in a safe state or it is brought into
a safe state. In this case, it is necessary to use specially qualified technology that fulfills
the requirements described in the associated Standards. The requirements to implement
functional safety are based on the following basic objectives:
• Avoiding systematic faults
• Controlling random faults or failures
Benchmarks for establishing whether or not a sufficient level of functional safety has been
achieved include the probability of hazardous failures, the fault tolerance and the quality
that is to be guaranteed by avoiding systematic faults. This is expressed in the standards
using specific classification. In EN 61508, IEC 62061 "Safety Integrity Level" (SIL) and
EN ISO 13849‑1 "Category" and "Performance Level" (PL).
292
Technical data - response time
Unit
[ms]
Worst case delay time
20 ms
SINAMICS S200 pulse train servo drive system with SIMOTICS S-1FL2
Operating Instructions, 11/2023, FW V6.3, A5E51646767B AA
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