Rockwell-automation 1771-N SERIES High Resolution Analog Module User M Manual do Utilizador descarregar pdf (Página 27)

2–9Installing 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) sourcing current

Terminal I is the lead compensation (B) sense input

Terminal R is common (C)

RTD

Connecting 4ĆWire

Sensors

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Rockwell-automation 1771-N SERIES High Resolution Analog Module User M Manual do Utilizador Página 27