BS EN IEC 61158-6-3:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 3 elements

Automatic control systems
Application layer (OSI)
Communication procedures
Interfaces (data processing)
Process control
Computer networks
Fieldbus
Communication networks
Data transmission
Bus networks
Open systems interconnection
Industrial

Link: BS EN IEC 61158-6-3:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 3 elements
Source: BSI Standards