Datalogic C-BOX 300 Installation Manual

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Datalogic C-BOX 300 Installation Manual Manual pdf 12 page image

Terminating Resistors Terminating resistors must be used if the C-BOX isinstalled at the beginning or end of the PROFIBUS cablesegment. In this case, it is recommended to usePROFIBUS connectors which contain an integratedterminating resistor. It is recommended to use connectorsfrom ERNI and Siemens. If the bus is incorrectlyterminated, this can lead to errors in data transfer or todamage to other stations on the bus.Bus Connectors It is recommended to use only commercially availablePROFIBUS connectors for connecting the bus. It isrecommended to use connectors from ERNI and Siemens.Cable Shield Shielded cables are less sensitive to interference due toelectromagnetic fields. With shielded cables, theinterference currents are led to ground through theshielding rail, which is electrically connected to the case.To ensure that the interference currents which flowthrough the shielding do not themselves interfere withother devices, it is important to provide a low impedanceconnection to the protective ground. Observe the followingrules for the shields of the PROFIBUS cable and the serialinterface cable:– The braiding of the shielding should have adegree of coverage of more than 80%.– The shielding should include a braided shield andshould not consist solely of foil shielding, sincethe latter can be easily damaged by cable tensionand pressure.– To ensure good immunity to interference at highfrequencies as well, the shielding of the cableshould be attached to the shielding rail at bothends of the cable.When connecting up the C-BOX 3X0, it is recommended to observe the guidelines inthe VDE 0100 regulations for handling electrical equipment.WEEE COMPLIANCEx