Rockwell Automation 1760-xxxx Pico Controller User Manual - Manual (Page 45)

Publication 1760-UM001D-EN-P - September 2005
Installation 2-21
Temperature Sensors
20 mA Sensors
Connect 4 to 20 mA (0 to 20 mA) sensors using an external 500
Ω
resistor, as shown above. The resultant impedance to the sensor is
approximately 478
Ω.
The following values result (Based on V = R x I = 478
Ω x 10 mA =
4.8V dc):
• 4 mA = 1.9V dc
• 10 mA = 4.8V dc
• 20 mA = 9.5V dc
V dc
V dc COM I2 I3 I4 I5 I6 I7 I8 I1
Inputs x V dc (I7,I8 0 to 10V)
+V dc (12V dc or 24V dc)
-0V
Out
0 to 10V
-35 to +55˚C
(-31 to +131˚F)
V dc
0V
F1
V dc = 12Vdc for 1760-L12DWD
V dc = 24V dc for 1760-LxxBWB-xx
V dc
1A
0V
500 Ω
4 to 20 mA
V dc
V dc COM I2 I3 I4 I5 I6 I7 I8 I1
Inputs x V dc (I7,I8 0 to 10V)
V dc = 12Vdc for 1760-L12DWD
V dc = 24V dc for 1760-LxxBWB-xx