Rockwell Automation 1762-IR4 RTD/Resistance Input Module - Manual (Page 30)

Publication 1762-UM003A-EN-P - February 2003
2-12 Installation and Wiring
To wire your module follow these steps:
1. At each end of the cable, strip some casing to expose the
individual wires.
2. Trim the signal wires to 2-inch (5 cm) lengths. Strip about 3/16
inch (5 mm) of insulation away to expose the end of the wire.
3. At the module end of the cable, twist the drain wire and foil
shield together, bend them away from the cable, and apply
shrink wrap. Then earth ground via a panel or DIN rail
mounting screw at the end of the module. Keep the length of
the drain wire as short at possible.
4. At the other end of the cable, cut the drain wire and foil shield
back to the cable and apply shrink wrap.
5. Connect the signal wires to the terminal block as described for
each type of input. See Wiring RTDs on page 2-12 or Wiring
Resistance Devices (Potentiometers) on page 2-14.
6. Connect the other end of the cable to the analog input device.
7. Repeat steps 1 through 6 for each channel on the module.
Wiring RTDs
Three types of RTDs can be connected to the 1762-IR4 module:
•
2-wire RTD, which is composed of an RTD EXC (excitation) lead
wire and a RTN (return) lead wire
•
3-wire RTD, which is composed of a Sense and 2 RTD lead
wires (RTD EXC and RTN)
•
4-wire RTD, which is composed of a Sense and 2 RTD lead
wires (RTD EXC and RTN). The second sense wire from the
4-wire RTD is left open.
ATTENTION
!
Be careful when stripping wires. Wire fragments that
fall into a module could cause damage at power up.