7.3.2 Analog Inputs, Powered from Switch Power
Two-Wire Sensors
Three-Wire Sensors
+
−
Analog IN
SPx
GND
−
+
sensor
dc common
+
−
Analog IN
SPx
GND
−
+
sensor
dc common
Two-wire analog sensor or two-wire NAMUR proximity
sensor using a FlexPower Node and powered using the
Node’s switch power.
Do not exceed analog input ratings for analog inputs. Only
connect sensor outputs to analog inputs.
Three-wire analog sensor using a FlexPower Node and
powered using the Node’s switch power.
Do not exceed analog input ratings for analog inputs. Only
connect sensor outputs to analog inputs.
7.3.3 Analog Inputs, Powered Externally
Do not exceed analog input ratings for analog inputs. Only connect sensor outputs to analog inputs.
Two-Wire Sensors
Three-Wire Sensors
Analog IN
GND
dc common
external power
−
+
sensor
Analog IN
GND
external power
dc common
sensor
−
+
Two-wire analog sensor using a FlexPower Node but the
sensor is powered externally (not from the SureCross
device).
Three-wire analog sensor using a FlexPower Node but the
sensor is powered externally (not from the SureCross
device).
7.3.4 Analog Inputs, Temperature Sensors
Thermocouple
RTD
Ax+
Ax−
TC
+
−
A1+
A1−
DI1
TC Type
- Wire
+ Wire
This wiring diagram applies to a standard three-wire RTD
sensor. When using thermocouple and RTD sensors, the
quality of the power supply influences the accuracy of the
signal.
J
red
white
K
red
yellow
R
red
black
Sure Cross
®
Performance DX80 Wireless I/O Networks
62
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