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F2-JB-#.I, F*-JB-#.*
Installation/Commissioning
8.4
Grounding/Shielding of Fieldbus Transmission Lines
Shielding connections of spurs are internally connected with the "S" terminal. Shielding
connections of trunks are internally connected with the "T" terminal. The grounding terminals
are connected with the external grounding clamp.
If you intend to hard-ground the shields of spurs: Connect the terminal "S" with one of the
"Earth" terminals using the accessory part JB-BR-TB.
If you intend to hard-ground the shields of trunks: Connect the terminal "T" with one of the
"Earth" terminals using the accessory part JB-BR-TB.
By connecting a suitable capacitor between the "Earth" and "S" or "T" terminals, a capacitive
ground of the shield of the corresponding fieldbus transmission line is achieved.
If terminals "S" or "T" are not connected with the "Earth" terminal, the shield of the fieldbus
transmission line in question is not grounded.
If the shield of the trunk or spurs of a fieldbus transmission line is grounded for EMC Directive
reasons, observe the following requirements closely: IEC/EN 60079-14, section 12.2.2.3, PNO
Handbook PROFIBUS MBP, section 3.3.3, or FOUNDATION Fieldbus Application Guides,
Sections 6.2 and 6.3.
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