BS EN 61784-3-2:2017 Industrial communication networks. Profiles Functional safety fieldbuses. Additional specifications for CPF 2

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

Link: BS EN 61784-3-2:2017 Industrial communication networks. Profiles Functional safety fieldbuses. Additional specifications for CPF 2
Source: BSI Standards

BS EN 60679-1:2017 Piezoelectric, dielectric and electrostatic oscillators of assessed quality Generic specification

Capability approval
Oscillators
Acceptance (approval)
Assessed quality
Crystal resonators
Quality control
Electrical measurement
Definitions
Piezoelectric devices
Endurance testing
Circuits
Inspection
Qualification approval
Testing conditions
Ratings
Electrical testing
Noise (spurious signals)
Marking
Approval testing
Quartz
Performance testing
Electronic equipment and components
Mechanical testing
Visual inspection (testing)
Environmental testing
Crystals (electronic)

Link: BS EN 60679-1:2017 Piezoelectric, dielectric and electrostatic oscillators of assessed quality Generic specification
Source: BSI Standards