BS EN IEC 61158-6-19:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 19 elements

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

Link: BS EN IEC 61158-6-19:2019 Industrial communication networks. Fieldbus specifications Application layer protocol specification. Type 19 elements
Source: BSI Standards