4 Cabling the AC 800F
4-87
Fig. 4-63 shows redundant cabling of two AC 800F with one serial fieldbus module
each, using channel 0. Connect the signals to one or more (up to 30) RS485 devices,
as specified.
Fig. 4-63 Redundant cabling of FI 820F via RS485 interface
• When working in the redundant mode, exclusively use an
external termination with external power supply. If the module’s
termination voltage is used, the bus is not terminated properly when
the module is switched off or replaced.
• Make sure that no jumpers are set on the fieldbus modules FI 820F
and that the switches on the internal terminal block TB 870F are in
the OFF position.
In the example described above it is assumed that an AC 800F is connected to the
end of the bus cable.
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