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OHMs Inputs
Ohms inputs are wired similar to 2-wire RTD inputs. That is, they
require a current source, and thus must use one of the IRTD current
sources. Also, two terminals are jumpered together as they are for
two-wire RTD inputs.
Analog channels wired for Ohms inputs differ from RTD inputs in
these aspects:
n Ohms inputs connect to variable resistance devices other than
RTDs, and
n Ohms inputs are configured in ControlEdge Builder as Ohms
inputs, rather than as RTD inputs.
Examples of wiring for resistance inputs are given in RTD Inputs
section.
Shield Grounding
Shields must be grounded as described under Shield Grounding at
the beginning of this guide.
CAUTION:
- Hazardous voltages exist at terminal blocks.
- Using switches at field devices disconnect the field wiring from
power sources before servicing.
- Failure to comply with these instructions could result in death
or serious injury.
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