Rockwell Automation 1760-DNET Pico DeviceNet Communications Module User Manual - Manual (Page 157)

Publication 1760-UM003A-EN-P - September 2005
Glossary 5
Fieldbus
Data network on the sensor/actuator level. The fieldbus interconnects
the devices at field level. Characteristic feature of the fieldbus is the
highly reliable transfer of signals and real-time response.
Field power supply
Power supply for the field devices and signal voltage.
Galvanic coupling
Galvanic coupling generally develops between two circuits using a
common cable. Typical interference sources are starting motors, static
discharge, clocked devices and potential difference between the
component enclosure and their common power supply.
GND
Abbreviation for “GROUND“ (zero potential).
hexadecimal
Numerical system with the base 16. The count starts at 0 to 9 a
continues with the letters A, B, C, D, E and F.
I/O
Abbreviation for “Input/Output“.
Impedance
Alternating current-resistance of a component or of a circuit consisting
of several components at a specific frequency.
Low-impedance connection
Connection with low alternating-current resistance.
Inactive metallic parts
Touch-protected conductive components, isolated electrically from
active metallic parts by means of an insulation, but subject to
fault-voltage.
Inductive coupling
Inductive (magnetic) coupling develops between two current-carrying
conductors. The magnetic effect generated by the currents induces an
interference voltage. Typical interference sources are, for example