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+V
CC
4 to 20 mA
+
-
Use current shunt resistor R17 to convert current to
Ω
voltage; 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
(R1 in this case).
Note that the signals shown for the STP268 screw
terminal panel correspond to connector J1.
Figure 24: Connecting Current Inputs to the STP268 (Shown for Channel 0)
Analog Input 0
Analog Input 0
Return
R1
Analog Ground
STP268 Panel
TB1
R17
TB2
Wiring Signals
5
TB34
5
5
5
5
5
5
5
5
75
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