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

BS EN IEC 61158-6-23:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 23 elements

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

Link: BS EN IEC 61158-6-23:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 23 elements
Source: BSI Standards

BS EN IEC 61158-6-21:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 21 elements

Automatic control systems
Real-time systems
Data transfer
Local area networks
Data processing
Data transmission
Data circuit-terminating equipment
Industrial
Process control
CSMA/CD networks
Computer networks

Link: BS EN IEC 61158-6-21:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 21 elements
Source: BSI Standards

BS EN IEC 61158-6-12:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 12 elements

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

Link: BS EN IEC 61158-6-12:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 12 elements
Source: BSI Standards