Standard No.:	GB/T 20438.4-2017
Chinese Name:	电气/电子/可编程电子安全相关系统的功能安全 第4部分：定义和缩略语
English Name:	Functional safety of electrical/electronic/programmable electronic safety-related systems—Part 4:Definitions and abbreviations
Professional Classification:	N10 Industrial automation and control device in general
ICS Classification:	25.040
Issued by:
Issued on:
Implemented on:	2018-07-01
Status:	VALID
Replace:	GB/T20438.4-2006 Functional safety of electrical/electronic/programmable electronic safety-related systems―Part 4: Definitions and abbreviations
Language:	English
File Format:	PDF
Word Count:	18000 words
Price(USD):	(USD)
Delivery:	via email in 1-5 business day

1 Scope

1.1 This part of GB/T 20438 contains the definitions and explanation of terms that are used in GB/T 20438.1~GB/T 20438.7.

1.2 The definitions are grouped under general headings so that related terms can be understood within the context of each other. However, it should be noted that these headings are not intended to add meaning to the definitions.

1.3 GB/T 20438.1, GB/T 20438.2, GB/T 20438.3 and GB/T 20438.4 are basic safety publications, although this status does not apply in the context of low complexity E/E/PE safety-related systems (see 3.4.3 of GB/T 20438.4-2017). As basic safety publications, they are intended for use by technical committees in the preparation of standards in accordance with the principles contained in IEC Guide 104 and ISO/IEC Guide 51. GB/T 20438.1, GB/T 20438.2, GB/T 20438.3 and GB/T 20438.4 are also intended for use as stand-alone publications. The horizontal safety function of GB/T 20438 does not apply to medical equipment in compliance with the IEC 60601 series.

1.4 One of the responsibilities of a technical committee is, wherever applicable, to make use of basic safety publications in the preparation of its publications. In this context, the requirements, test methods or test conditions of this basic safety publication will not apply unless specifically referred to or included in the publications prepared by those technical committees.

1.5 Figure 1 shows the overall framework of the GB/T 20438 series and indicates the role that this part plays in the achievement of functional safety for E/E/PE safety-related systems.