4 Cabling the AC 800F
4-88
If the two redundant AC 800F are not located at the end of the bus cable, proceed
as seen in Fig. 4-60. Follow the instructions below:
• Deactivate the internal termination of the serial fieldbus modules.
• Deactivate the termination of both terminal blocks TB 870F.
• Link two redundant modules FI 820F with the terminal block TB 870F using cable
TK 821F. Only hand-tighten the screws.
• Put on the TK 821F cable shields. Connect them to the AC 800F contact ledges
using clips TV 83xF.
• Cable the respective interfaces of the terminal blocks TB 870F to each other,
using the terminals specified below, and establish a connection to the RS485
devices. Use a twisted pair cable, e.g. 1 x 2 x 0.25 mm
2
.
• Apply the shield to terminal P of the terminal block.
• Provide a bus termination at each end of the bus cable, as seen in Fig. 4-60.
• Keep branch cables to the nodes as short as possible.
• Observe the max. cable length of 1200 m.
• When touching the terminating jumpers take the necessary ESD
protection measures. Follow the instructions given in Section 2.
• If the shield is not put on properly, neither RFI suppression nor
EMI/RFI shielding of the system can be guaranteed.
• Make sure that no jumpers are set on the fieldbus modules FI 820F
and that the switches on both terminal blocks TB 870F areinthe
OFF position.
• Remember the terminating resistors at each end of the bus
cable.
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