En 62061 - Siemens Sinamics S110 Function Manual

The standard describes how the performance level (PL) is calculated for safety-related
components of the controller on the basis of designated architectures. In the event of any
deviations from this, EN ISO 13849-1 refers to EN 61508.
When combining several safety-related parts to form a complete system, the Standard
explains how to determine the resulting PL.
Note
Since May 2007, EN ISO 13849-1 has been harmonized as part of the Machinery Directive.
EN 954-1 will continue to apply until 30.12.2011.
8.1.2.5

EN 62061

EN 62061 (identical to IEC 62061) is a sector-specific standard subordinate to IEC/EN
61508. It describes the implementation of safety-related electrical machine control systems
and looks at the complete lifecycle, from the conceptual phase to decommissioning. 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 derived from the risk
analysis are sub-divided into sub-safety functions, which are then assigned to real devices,
sub-systems, and sub-system elements. Both the hardware and software are covered. EN
62061 also describes requirements regarding the implementation of application programs.
A safety-related control systems comprises different sub-systems. From a safety
perspective, the sub-systems are described in terms of the SIL claim limit and PFH
characteristic quantities.
Programmable electronic devices (e.g. PLCs or variable-speed drives) must fulfill EN 61508.
They can then be integrated in the controller as sub-systems. The following safety-related
characteristic quantities must be specified by the manufacturers of these devices.
Safety-related characteristic quantities for subsystems:
● SIL CL: SIL claim limit
● PFH
● T1:
Simple sub-systems (e.g. sensors and actuators) in electromechanical components can, in
turn, comprise sub-system elements (devices) interconnected in different ways with the
characteristic quantities required for determining the relevant PFH
Safety-related characteristic quantities for subsystem elements (devices):
Function Manual
Function Manual, 01/2011, 6SL3097-4AB10-0BP3
:
D
Probability of dangerous failures per hour
Lifetime
Safety Integrated Functions
8.1 Standards and regulations
D
value of the sub-system.
D
323