Rockwell Automation T743x-xx ICS Regent+Plus RTD Input Equipment - Manual (Page 7)

RTD Input Equipment (T7432)
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Termination Panel and Multiplexer
Figure 4 shows the physical features of the RTD termination
panel and multiplexer. The multiplexer plugs into the
termination panel and is secured in place with two thumb
screws located at each end of the multiplexer. Up to three
multiplexers can be installed in a single termination panel.
Each multiplexer interfaces to a separate RTD input module
installed in an I/O Chassis.
Sixteen current sources are installed on the termination panel
to source current to each RTD. The current sources are
powered from the installed multiplexers and share power
when multiple multiplexers are installed.
Termination cables plug into the DB-9 connectors located to
the right of the three multiplexers. Each cable interfaces one
multiplexer to its associated input module installed in an I/O
chassis.
RTD inputs are wired to the terminal blocks located along the
bottom of the termination panel. Each of the four terminal
blocks has screw terminals for 4 RTD inputs. Four screw
terminals are provided for each RTD input. Two additional
ground terminals on each terminal block are provided to
connect RTD cable shield wires if desired.
RTD Multiplexer Indicators
Each RTD multiplexer has status indicators for power supply
voltages, and transmit data. When positive and negative
supply voltages are present at the termination panel, the + V,
and – V indicators are on. The TX indicator is on when the
Mux is transmitting data to the input module. Normally, all
these green indicators should be on.