Glossary
Bus terminating resistor | Resistor at the beginning and end of a bus line for preventing |
| disturbance caused by signal reflections and for adapting bus |
| cables. Bus terminating resistors must always be the last unit |
| at the end of a bus segment. |
Capacitive coupling | Capacitive (electrical) coupling develops between two |
| conductors carrying different potentials. Typical interference |
| sources are, for example parallel signal cables, contactor |
| relays and static discharge. |
Chassis ground | Entirety of all interconnected inactive equipment parts that do |
| not have any contact voltage, even in the event of a fault. |
Coding element | |
| electronic and basic module. |
| memory that are capable of executing particular commands |
| (such as output substitute values). |
Common potential | Electrical interconnection of the reference potentials of the |
| control and load circuit of I/O modules. |
Configuring | Systematic arrangement of the I/O modules of a station. |
CPU | Abbreviation for “Central Processing Unit”. Central unit for |
| data processing, which represents the core element of a |
| computer. |
Digital | A value, for example voltage, that can only be represented by |
| a certain number of states within a defined range, usually |
| defined as 0 and 1. |
DIN | Abbreviation for “Deutsches Institut für Normungen e.V.” |
| (German Institute for Standardization). |
Earthing strip | Flexible conductor, mostly braided. Interconnects inactive |
| parts of equipment, e.g. the doors of a control panel and the |
| switch cabinet body. |
Electrical equipment | All objects that are used for the generation, conversion, |
| transfer, distribution and use of electric power, such as |
| conductors, cables, machines, control devices. |
194 | For more information visit: www.EatonElectrical.com | MN05013001E |
