ABB AC 800F Mounting And Installation Instructions Manual page 148

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2. FI 820F not installed at the end of the bus cable.
Cable the terminal block TB 870F with the other RS485 nodes on the bus as seen
in Fig. 4-60. Keep the branch cables to the nodes as short as possible.
Fig. 4-60 Cabling FI 820F via RS485 interface, case 2
Provide a termination at both ends of the bus cable, as described above. Use a
shielded TP cable according to the instructions given above.
4-82
•
Make sure that no jumpers are set on the FI 820F module and
that the switches on the terminal block TB 870F are in the
OFF position.
•
Remember the terminating resistors at both ends of the bus
cable.
Cabling the AC 800F