Archived 2016 Lapp Group International Catalog

Appendix Glossary

ÖLFLEX ® ACCESSORIES FLEXIMARK ® SILVYN ® SKINTOP ® EPIC ® HITRONIC ® ETHERLINE ® UNITRONIC ® APPENDIX

A certain maximum resistance is assigned to the nominal cross-sec- tion, within which the conductor structure is specified. The cross- section is normally specified in mm 2 . However, for certain types of cables, which are always made up of single-core conductors (telecom- munications cables), the conductor diameter is used for marking or description. CSA Abbreviation for “Canadian Standards Association”. Canadian standards and testing body. Similar to VDE in Germany.

Density Ratio of the mass to the volume of a body. If the mass is M and the volume is V, the radio is the density d = M/V. Density unit Result of the density of a body relative to the density of water (= 1). Corresponds to the specific weight. Designation label Fixing elements with which single wires, bundles, cables and cables on machine parts or walls can be permanently fixed in place. They are transparent or coloured, usually made from nylon and can display indelible information about their content. DESINA ® The Verein Deutscher Werkzeugmaschinenfabriken e. V. (VDW) [German Machine Tool Manufacturing Federation] developed DESINA ® (DEcen- tralised and Standardised INstAllation technology), a comprehensive overall concept for standardisation of electrical installation of equip- ment and machinery. Colour codes of cables: • Servo cable, screened: Sheath colour orange RAL 2003 • Cable for measuring systems, screened: Sheath colour green RAL 6018 • Power cable, unscreened: Sheath colour black RAL 9005 • 24 Volt control cable, unscreened: Sheath colour grey RAL 7040 (similar to 7001) • Field bus hybrid cable, Cu and light waveguide: Sheath colour violet RAL 4001 • Sensor/actuator cable, unscreened: Sheath colour yellow RAL 1021 DeviceNet TM Simple CAN-based communication system for networking of industrial automation equipment (limit transmitters, photo sensors, motor start- ers, frequency controlled drives, control terminals and similar) with master control equipment. Two screened twisted pairs of conductors within a cable are used as the transmission medium. One is used for communication (with transmission rates of 125, 250 or 500 kBit/s for cable lengths of 500 m, 250 m or 100 m) and the other to supply power to the connected equipment (max. 8 A for 24 V DC voltage). Dielectric Dielectric refers to the characteristic of certain substances to be elec- trically non-conductive – therefore insulating. Any electrically insulat- ing material in which an external electrical field (e. g. between the plates in a capacitor) builds up an opposing field is referred to as die- lectric. A dielectric causes a static electrical field to be retained even without a continuous supply of electric charge. Dielectric constant (DC) A material constant for a dielectric. The dielectric constant specifies how many times greater the capacitance of the capacitor will be if the insulating material is used as the dielectric instead of air. Multiplying the DC of the empty space by the dielectric constant gives the DC of the dielectric. Diffusion The primary cause of attenuation in a light waveguide. It is the result of microscopic fluctuations in the density of the glass, which deflect part of the guided light sufficiently from its course that it actually leaves the light waveguide. With light wavelengths above 1600 nm, this effect is very weak, however it increases at short wavelengths by the wave- length to the power of four (Rayleigh dispersion).

Current Electrical unit, measured in Amperes. Current = Voltage/Resistance.

D D.C. Abbreviation for direct current.

Dark current Current at the output of an optical receiver if no radiation is present.

Data bus A system of associated cables, to which data bits are transferred.

Data transmission cable Cables whose structure make them suitable for transmitting electric data processing pulses with minimum errors. Simple (pair) or more complex (screening) constructions are required depending on the susceptibility of the data pulses to faults (brand: UNITRONIC ® at Lapp). Computer cables (Li2YCY-PIMF) or other, at least twisted in pairs, normally screened and often individually screened cables, e. g. UNITRONIC ® LIYCY (TP), UNITRONIC ® BUS; UNITRONIC ® LAN, tele- phone cable, also light waveguide cables. TP = Twisted pair. Data transmission rate Unit of measure for the transmission speed of a data transmission. It is measured in bit/s or byte/s. Data transmission, data transfer Optical data transmission is always serial. Before data transmission, pending parallel data is always prepared for serial transfer and is post-processed to a parallel form after the transmission. We also refer to bit serial data transmission, as all of this data is always transferred as digital signals. Decibel A decibel is the logarithmic ratio of two levels (e. g. input level to output level). The unit of measure has no dimension and is specified in dB. Degrees of protection Protection of electrical equipment by housing, covers etc. Protection of equipment against the ingress of foreign bodies and water. DEL Abbreviation for Deutsches Elektrolytkupfer für Leitzwecke (German electrolyte copper for conduction) DEL is the stock market code for 99.5% pure copper in Euro/100 kg (see T17). DEMKO Abbreviation for Danmarks Elektriska Materialkontroll – Danish stand- ards and testing body, testing and certification body, tasks similar to VDE/UL.

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