BS EN IEC 61158-6-2:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 2 elements

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

Link: BS EN IEC 61158-6-2:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 2 elements
Source: BSI Standards