Siemens SINAMICS S120 Function Manual page 564

Safety Integrated basic functions
9.2 General information
● IEC 61508
● IEC 61800-5-2
Note
Certifications
In conjunction with certified components, the safety functions of the SINAMICS S120 drive
system fulfill the following requirements:
• Category 3 to EN 954-1/ ISO 13849-1.
• Safety integrity level 2 (SIL 2) to IEC 61508.
In addition, the SINAMICS S120 safety functions are normally certified by independent
institutions. A list of currently certified components is available on request from your local
Siemens office.
Note
Low-voltage directive
When operated in dry areas, SINAMICS devices with three-phase motors conform to Low-
Voltage Directive 2006/95/EC.
Two-channel monitoring structure
All the main hardware and software functions for Safety Integrated are implemented in two
independent monitoring channels (e.g. switch-off signal paths, data management, data
comparison).
The two drive monitoring channels are implemented using the following components:
● Control Unit
● The Motor Module / Power Module belonging to a drive.
The monitoring functions in each monitoring channel work on the principle that a defined
status must prevail before each action is carried out and a specific acknowledgement must
be made after each action.
If these expectations of a monitoring channel are not fulfilled, the drive coasts to a standstill
(two-channel) and an appropriate message is output.
562
Functional reliability of electrical and electronic systems
This standard defines "safety integrity levels" (SIL), which not only describe a certain
degree of integrity with regard to safety-oriented software but also defined, quantitative
error probability ranges with regard to the hardware.
Adjustable-speed electrical power drive systems
Part 5-2: Safety requirements - Functional
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
Drive functions