Rockwell Automation 1771-QDC, D17716.5.86(Passport) PLASTIC MOLDING MODULE - Manual (Page 35)

Install the QDC Module
Chapter 2
2-9
Analog inputs and outputs are sensitive to electrical noise interference.
Take care to shield them properly.
Guidelines:
Use 22-gage (or larger) twisted-pair cable, 100% shielded with drain
wire, such as Belden 8761. For cable distances over 50 ft, use 18-gage
cable such as Belden 8760.
Ground the cable shield at one end only; generally at the sensor or
amplifier end of the cable, not at the I/O chassis (see Figure 2.4 and
Figure 2.5)
Figure 2.4
Shielding Differential Inputs
Connect the cable shield
and case ground to earth
ground at the Input Sensor
Input Sensor
18
17
14
QDC Module Input
Input Module Common
should float
+
–
10910Ć2
+15V
-15V
No User Connectiions.
For Test Purposes, only.
Ground and Shield
Your I/O Devices