Rockwell Automation 1771-QDC, D17716.5.87(Passport) CLAMP AND EJECT MODE - Manual (Page 30)

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 (or equivalent). For cable distances over
50 ft, use 18-gage cable such as Belden 8760 (or equivalent)
Ground the cable shield at one end only; generally at the sensor or
amplifier end, 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 Connections.
For Test Purposes, Only.
Ground and Shield
Your I/O Devices