GB/T 20438.4-2017

This standard provides the essential definitions and abbreviations for the terminology used across the GB/T 20438 series on functional safety. It is applied in the design, development, and assessment of electrical, electronic, and programmable electronic safety-related systems in industries such as manufacturing, process control, and machinery. The standard ensures consistent understanding and communication among engineers, safety assessors, and procurement professionals when specifying or evaluating safety system requirements.