Operational Overview
Doc.#6000-0015 Rev: A
Page 23
Voltage Sensors (SIO models SC110 – SC113)
These SIO units interface to sensors with high-level voltage outputs and
accept either single or differential inputs. The SIOs supply a l5
volts to power sensors. Select the SIO unit based on the output voltage
levels of the sensor. The SIO inputs/outputs on the terminal block are
shown in Table 3.
Table 3. Voltage Sensor Pinout
Pin Signal
1 Ground
(Node
ground)
2
Differential positive (or single ended) voltage input
3
Differential negative voltage input
4
+5 VDC out
The SIO can supply power (+5 VDC) to the sensor, if the sensor power
requirements are within the SIO current supply range (see Node
specifications, Appendix A). This is the preferred method of connection.
Internally powered (node powered) sensor connections, illustrated in Figure
17, are:
a. Sensor ground (Ground) to pin 1.
b. Sensor power (Vcc) to pin 4.
c. Sensor ground (Ground) to pin 3 (negative differential input).
d. Sensor output (Out) voltage to pin 2 (positive differential input).
Sensor
Ground
Out
Vcc
SIO
Pin 4
+5 V
Pin 3
-Vin
Pin 2
+Vin
Pin 1
Ground
Figure 17. Internally Powered Sensor Connections
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