Siemens SINAMICS S120 Function Manual page 358

Safety Integrated basic functions
9.1 General information
● EN 60204-1:2006
● IEC 61508
● IEC 61800-5-2
Note
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
When operated in proper condition and in dry operating areas, SINAMICS devices with
three-phase motors conform to Low-Voltage Directive 73/23/EEC.
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.
358
Safety of machinery - Electrical equipment of machines - Part 1: Electrical equipment of
machinery - General requirements
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), 10/2008, 6SL3097-2AB00-0BP5
Drive functions