Rockwell Automation 1771-QDC, D17716.5.93(Passport) PLASTIC MOLDING MODULE - Manual (Page 41)

Install the QDC Module
Chapter 2
2-9
ATTENTION: The QDC module has ESD protection to 20kV,
but you can damage the module by accidental application of the
wrong voltage to the I/O terminals. Do not exceed:
This voltage: On these terminals: When in:
+12V dc input (18 thru 10) any mode
+12V dc output (09 thru 02) voltage mode
+24V dc output (09 thru 02) current mode
Analog inputs and outputs are sensitive to electrical noise interference.
Take care to ground and 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, 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)
+
–
10910ĆI
Ground and Shield
Your I/O Devices