En 62061 - Siemens Sinumerik 840D sl Function Manual

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EN 62061

EN 62061 (this is identical to IEC 62061) is a sector--specific standard below

EN 61508. It describes the implementation of safety--related electrical control

systems of machines and takes into account the complete lifecycle -- from the con-

ceptual phase to de--commissioning. The standard is based on the quantitative and

qualitative analyses of safety functions,

whereby it systematically applies a top--down approach to implementing complex

control systems (known as "functional decomposition"). The safety functions deri-

ved from the risk analysis are sub--divided into sub--safety functions, which are

then assigned to real devices, subsystems, and subsystem elements. Both the

hardware and software are covered. EN 62061 also describes the requirements

placed on implementing application programs.

A safety--related control systems comprises different subsystems. From a safety

perspective, the subsystems are described by means of the characteristic quanti-

ties (SIL claim limit and PFH

Programmable electronic devices, e.g. PLCs or variable--speed drives must

comply with EN 61508. They can then be integrated into the control system as

subsystems. The following safety--related characteristic quantities must be speci-

fied by the manufacturers of these devices.

Safety--related characteristic quantities for subsystems:

S SIL CL: SIL claim limit

Basic subsystems, e.g. sensors and actuators comprising electromechanical com-

ponents, can, in turn, comprise different interconnected subsystem elements (devi-

ces) with the characteristic quantities to determine the corresponding PFH

of the subsystem.

SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition

Probability of dangerous failures per hour

Regulations and standards

1.2 Safety of machinery in Europe

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