To help minimize the effects of electromagnetic interference, cables carrying fieldbus communication signals must be shielded.
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UNINTENDED EQUIPMENT OPERATION |
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oUse shielded cables for communication signals. oGround cable shields for communication signals at a single point 1. oAlways comply with local wiring requirements regarding grounding of cable shields. |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
1Multipoint grounding is permissible if connections are made to an equipotential ground plane dimensioned to help avoid cable shield damage in the event of power system short-circuit currents.
The use of shielded cables requires compliance with the following wiring rules:
oFor protective ground connections (PE), metal conduit or ducting can be used for part of the shielding length, provided there is no break in the continuity of the ground connections. For functional ground (FE), the shielding is intended to attenuate electromagnetic interference and the shielding must be continuous for the length of the cable. If the purpose is both functional and protective, as is often the case for communication cables, the cable must have continuous shielding.
oWherever possible, keep cables carrying one type of signal separate from the cables carrying other types of signals or power.
Protective Ground (PE) on the Backplane
The protective ground (PE) should be connected to the conductive backplane by a heavy-duty wire, usually a braided copper cable with the maximum allowable cable section.
Cables carrying fieldbus communication signals must be shielded. The shielding must be securely connected to ground. The fieldbus communication cable shields must be connected to the protective ground (PE) with a connecting clamp secured to the conductive backplane of your installation.
The shielding of the Modbus cable must be connected to the protective ground (PE).
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HAZARD OF ELECTRIC SHOCK |
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oThe grounding terminal connection (PE) must be used to provide a protective ground at all times. oMake sure that an appropriate, braided ground cable is attached to the PE/PG ground terminal before connecting or disconnecting the network cable to the equipment. |
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Failure to follow these instructions will result in death or serious injury. |
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ACCIDENTAL DISCONNECTION FROM PROTECTIVE GROUND (PE) |
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oDo not use the TM2XMTGB Grounding Plate to provide a protective ground (PE). oUse the TM2XMTGB Grounding Plate only to provide a functional ground (FE). |
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Failure to follow these instructions can result in death, serious injury, or equipment damage. |
