132 ControlEdge HC900 Process & Safety Controller User and Installation Manual Revision 10
May 2019
Self-powered 4-wire transmitter sinking type transmitter with UIO
This wiring method can be applied to any of the channels 1 through 16.
Figure 83 - Self-powered 4-wire sinking type transmitter with UIO
UIO does not support the following input types:
Self-powered 4-wire transmitter with ground-referenced current source:
This is because the current return path is on the negative side of the
wire-pair.
Voltage input: This is because UIO supports only current measurements.
Slidewire: This is because UIO supports only current measurements.
Allowable field wiring resistance – Safety UIO - Analog Input channel
The maximum allowable field wiring resistance between the transmitter and the connection terminal is
dependent upon the voltage requirement of the transmitter. The formula for calculating the maximum
wiring resistance for the UIO channel used as an analog input is given by the following equation:
Rmax= [(19.0-Vtx) / (0.022)]
Where, Vtx=Voltage required at the transmitter terminal.
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