..\Manuals\RCI-200-RFM rev.B.doc
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Inputs:
The RCI-200 has two dry contact inputs and two 0-20mA inputs. The dry
contact inputs are excited with 24VDC and will source approximately 20mA
when the contact is closed. A red LED lights up when a contact input is
closed.
The analog inputs are configured as 0-20mA inputs and have a 250
Ω
input impedance.
Each input terminal has three connections: +24V, I/P, COM. The +24V power output
may be used to power field transmitters. Up to 500mA may be used to power a
transmitter. The input signal is connected to I/P(+) and COM(-).
Analog inputs are connected to the RCI-200 in two fashions: 1) Normal (3-wire connection) or 2) two-
wire connection. On a 3-wire connected input, an external power supply or the +24V power output
terminal of the RCI provides power to the field transmitter. The field transmitter has a current source
that provides the 4-20mA signal back to the RCI-200. If using the power supply of the RCI-200, the
field transmitter may draw up to 125mA. A total of 1A is available to power up to 8 field transmitters.
On a 2-wire connected input, the field transmitter receives power from the RCI-200 and superimposes
the signal onto the power return path. A maximum of 20mA will flow in such a connection. Make sure
to consult the field transmitter manual to determine how to connect it to the RCI-200.
