CLC IEC/TS 63394:2024
Guidelines functional safety of safety-related control system (SRCS)

ID 21442 | 24.02.2024 / Preview attached

CLC IEC/TS 63394:2024 Safety of machinery - Guidelines on functional safety of safety-related control system

In the context of the safety of machinery, the sector standard IEC 62061 as well as ISO 13849 1 provide requirements to manufacturers of machines for the design, development and integration of safety-related control systems (SCS) or safety-related parts of control systems (SRP/CS), depending on technology used (mechanical, pneumatic, hydraulic or electrical technologies) to perform safety function(s).

This document does not replace ISO 13849-1 and IEC 62061. This document gives additional guidance to the application of IEC 62061 or ISO 13849-1.

This document:

- gives guidelines and specifies additional requirements for specific safety functions based on the methodology of ISO 12100, which are relevant in machinery and respecting typical boundary conditions of machinery;
- considers safety functions which are designed for high demand mode of operation yet are rarely operated, called rarely activated safety functions;

NOTE 1 IEC 62061:2021 completely covers high demand. However, other safety functions related to the protection of the machine itself and indirectly of persons are considered more in detail in this document.

- gives additional information for the calculation of failure rates using other (non-electronic) technologies based e.g. on Weibull distribution, because all the formula defined in IEC 62061 and ISO 13849-1 are based on exponential distribution.

Therefore, the basis for these guidelines and additional requirements is

- a typical classification of safety functions;
- a consideration of typical architectures used for designing safety functions;
- a consideration of modes of operation of safety functions;
- the derivation and evaluation of PFH formulas for subsystems considering the used technology.

NOTE 2 These guidelines can also be used for application of ISO 13849-1 for the design process of SRP/CS.

This document does not address low demand mode of operation according to IEC 61508.

This document does not take into account either layer of protection analysis (LOPA) or basic process control system (BPCS), according to IEC 61511 as a risk reduction measure.

This document considers all lifecycle phases of the machine regarding functional safety, and SCS or SRP/CS.

NOTE 3 The user of the machine needs information from the machine manufacturer for the safe operation of the machine, e.g. useful lifetime of components, maintenance information, testing of safety functions if necessary.


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CLC IEC/TS 63074:2024
Security aspects functional safety of safety-related control systems

ID 21423 | 25.02.2024 / Preview attached

CLC IEC/TS 63074:2024 Safety of machinery - Security aspects related to functional safety of safety-related control systems

This technical specification identifies the relevant aspects of the IEC 62443 series related to security threats and vulnerabilities that are considered for the design and implementation of safety-related control systems (SCS) which can lead to the loss of the ability to maintain safe operation of a machine.

Typical security aspects related to the machine with potential relation to SCS are:

- vulnerabilities of the SCS either directly or indirectly through the other parts of the machine which can be exploited by security threats that can result in security attacks (security breach);
- influence on the safety characteristics and ability of the SCS to properly perform its function(s);
- typical use case definition and application of a corresponding threat model.

Non-safety-related aspects of security threats and vulnerabilities are not considered in this document.

The focus of this document is on intentional malicious actions. However, intentional hardware manipulation (e.g. wiring, exchange of components) or foreseeable misuse by physical manipulation of SCS (e.g. physical bypass) is not considered in this document.

This document does not cover security requirements for information technology (IT) products and for the design of devices used in the SCS (e.g., product specific standards can be available, such as IEC TS 63208).


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Collegati
IEC TS 63394:2023
ISO 13849-1:2023
CEI EN IEC 62061:2022