Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual - Manual (Page 27)

2–9 Installing the Module
Publication 1771ĆUM127B-EN-P - December 2002
Figure 2.5 shows how to connect 4-wire sensors to the remote
termination panel. A 4-wire sensor has two pairs of leads; one pair
for each resistor junction. One wire of the four is not used (it does
not matter which one). This leaves three wires – one pair and one
single wire. You must connect the single wire to the terminal marked
“O_”. You connect the remaining pair of wires to terminals “I_” and
“R_”. It doesn’t matter which wire of the pair connects to terminal
“I_” and which wire connects to terminal “R_” so long as all three
wires are the same AWG gauge.
Figure 2.5
Connecting a 4ĆWire Sensor to the Remote Termination
Panel
Ground
Chassis
Leave 1 lead open
Single lead connects
to terminal O
12935-I
Note: In this illustration:
Terminal O is the 1mA excitation (A) sourcingcurrent
Terminal I is the lead compensation (B) sense input
Terminal R is common (C)
RTD
Connecting 4ĆWire
Sensors