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Chapter 5
+V
CC
4 to 20 mA
User-Supplied
Bias Return
Resistor
Supply a current shunt resistor to convert current to voltage;
Ω
250
for 4 to 20 mA = 1 to 5 V. The common side of the
external loop supply must either connect to analog ground
or, if needed, to a bias return resistor.
Figure 25: Connecting Current Inputs to the STP268-EC
76
+
Analog Input 0
-
(Shown for Channel 0)
STP268-EC Panel
TB34
Analog Input 0 Return
Analog Ground
User-Supplied
Shunt Resistor
TB68
TB52
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