Operational Overview
Doc.#6000-0015 Rev: A
Page 27
2-Wire RTD sensor connections, illustrated in Figure 22, are:
a. Pin 1 to pin 3 on the SIO (at the SIO).
b. Pin 4 to pin 2 on the SIO (at the SIO).
c. Pin 3 (-Sense ) to the RTD.
d. Pin 4 (Excitation) to the RTD.
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IMPORTANT
The RTD must not be connected to any local ground.
RTD
SIO
Pin 4
EXC
Pin 3
-Sense
Pin 2
+Sense
Pin 1
Ground
Figure 22. 2-wire RTD Sensor Connections
Bridge (SIO model SC410):
Model SC410 supplies a reg5 VDC bridge excitation signal. The
bridge current requirements should not exceed that maximum current rating
of the SIO. However, since the Node uses a common regulator to supply all
four SIOs, some bridges could exceed that maximum rating as long as the
total current consumption (of all four attached SIOs) does not exceed the
aggregate maximum. The SIO inputs/outputs on the terminal block are
shown in Table 6.
Table 6. Bridge Sensor Pinout
Pin Signal
1 Ground
(Node
ground)
2
Positive bridge input
3 Negative
reference
4 Excitation
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