Safety of machinery - Safety related parts of control systems: Part 1 general principles for design
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Synosis Points
1
This part of ISO 13577 was developed to specify the requirements of a protective system, which is a safety-related electrical control system (SRECS) of industrial furnaces and associated processing equipment (TPE).
Mandatory safety-related control functions of TPE are specified in ISO 13577-1, ISO 13577-2, and ISO 13577-3.
It is intended that in designing the protective system of TPE, manufacturers of TPE choose from the four methods provided in this part of ISO 13577.
This part of ISO 13577 is to be used together with the other parts of ISO 13577. Since ISO 13577 is a type-C standard of ISO 12100, TPE are required to be designed in accordance with the principles of ISO 12100. However, there are cases in which a risk assessment according to IEC 61511 (all parts) is more suitable for the design of a TPE protective system.
This document is a type-C standard as stated in ISO 12100.
2
The machinery concerned and the extent to which hazards, hazardous situations, or hazardous events are covered are indicated in the scope of this part of ISO 13577.
When requirements of this type-C standard are different from those which are stated in type-A or -B standards, the requirements of this type-C standard take precedence over the requirements of the other standards for machines that have been designed and built according to the requirements of this type-C standard.
IEC 61511 (all parts) provides the option of a low-demand rate on the protective system. IEC 62061 or ISO 13849-1 always assume high-demand applications.
Therefore, this part of ISO 13577 permits extended risk assessment for SRECS in which risk assessment based on IEC 61511 (all parts) can be chosen as an alternative.