Rockwell Automation 1760-DNET Pico DeviceNet Communications Module User Manual - Manual (Page 154)

Publication 1760-UM003A-EN-P - September 2005
Glossary 2
Electrical equipment
Comprises all equipment used for the generation, conversion, transfer,
distribution and application of electrical energy, e.g. power lines,
cables, machines, controllers.
Reference ground
Earth potential in the area of grounding devices. May have a potential
other than the zero of "earth" potential.
Reference potential
Represents a reference point for measuring and/or visualising the
voltage of any connected electrical circuits.
Bidirectional
Operation in both directions.
Bit
Abbreviation for the term “binary digit“. Represents the smallest
information unit of a binary system. Its significance can be 1 or 0
(Yes/No decision).
Lightning protection
Represents all measures for preventing system damage due to
overvoltage caused by lightning strike.
Bus
Bus system for data exchange, for example between the CPU, memory
and I/O. A bus can consist of several parallel segments, e.g the data
bus, address bus, control bus and power supply bus.
Bus line
Smallest unit connected to the bus. Consists of the programmable
controller, a module and a bus interface for the module.
Bus system
All units as a whole which communicate across a bus.