recommendation for the installation of profibus and worldfip ... - CERN

CONNECTION RULESThe rules for connection of the active conductors and shielding are:• Connection of the conductors : See Appendix 1 and 2• Shielding and grounding of the fieldbus : See Appendix 2 and 3.• Minimum radius of curvature of the cable equal to ten times its diameter,that is 80 to 100mm.Note : Other recommendations relating to this chapter are detailed in two notes, onefrom Schneider [1], and the other from Alstom [2].SPEED AND DISTANCEAccording to the condition of use (environment, quality of the cable), the operationalmaximum distances will be the following ones:With a copper fieldbus• 31,25 kbit/s : from 5 to 20km• 1 Mbit/s : from 1 to 4km• 2.5 Mbit/s : from 500m to 1,5kmIn practice, to prevent any problems, the maximum distances selected are thefollowing:• 31,25 kbit/s : 10km• 1 Mbit/s : 1km• 2.5 Mbit/s : 700mWith an optical fieldbus• 31,25 kbit/s, 1 Mbit/s and 2,5 Mbit/s : 40kmCONCLUSIONDuring all the LHC construction, the cables and distribution boxes relating to theWorldFIP fieldbus will be held in stock in the CERN store.REFERENCES[1] Schneider Electric :Platform of Automatism Premium / Catalogue August 99[2] Alstom-Cegelec / WorldFIP :Design and installation Manual / ALS 50414 b-en / edition 03-9813