Glossary
Protective conductor | A conductor required for the protection against dangerous |
| currents, designated by the letters PE (abbreviation of |
| “Protective Earth”). |
Radiated coupling | Radiated coupling occurs when an electromagnetic wave |
| makes contact with a conductor structure. The impact of the |
| wave induces currents and voltages. Typical interference |
| sources are, for example ignition circuits (spark plugs, |
| commutators of electrical motors) and transmitters (e.g. |
| |
| corresponding conductor structure. |
Reference ground | Ground potential in the area of grounding devices. Unlike |
| "ground", which always has zero potential, it may have any |
| potential except zero. |
Reference potential | Represents a reference point for measuring and/or |
| visualizing the voltage of any connected electrical circuits. |
Repeater | Amplifier for signals transferred across a bus. |
Response time | In a bus system the time interval between the sending of a |
| read job and the receipt of the response. Within an input |
| module, it represents the time interval between the signal |
| change at an input and its output to the bus system. |
RS 485 | Serial interface in accordance with the EIA standard for high- |
| speed data transmission via several transmitters. |
Serial | Describes an information transfer technique. Data is |
| transferred in a |
Shield | Term that describes the conductive covering of cables, |
| cubicles and cabinets. |
Shielding | All measures and equipment used for connecting system |
| parts with the shield. |
Slave | Station in a bus system that is subordinate to the master. |
Station | Function unit or module, consisting of several elements. |
198 | For more information visit: www.EatonElectrical.com | MN05013001E |
