Siemens FC18 Series Operating Manual page 12

Note: In loop mode, wires from BP1 must end at AP1; wires from BS1 must end at AS1. The connection of field
devices (except FDCL181 isolator) is polarity free.
Fig. 2-5 Line card connection diagram (the same for other line)
Fig. 2-6 FRT/Mimic driver connection diagram
Note: Ensure positive and negative connections are properly in place, FC18-BUS is polarity sensitive.
Connect a 120Ω resistor as monitoring resistor. It must be connected to the end of the line. ( It also can be set
by the two-digit Dip-switch on the main board, see "Dip-switch" )
Fig. 2-7 Network connection diagram
FC18
To NAC
NAC+
NAC-
NAC connection
Fig. 2-8
Fig. 2-9 Main board input/output connection diagram
Operating Manual of FC18 Controller
NAC-EOL-FC18
Red
Black
diagram
Orange
20K
Visible and
resistor
audible device
Black
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