Rockwell Automation 1769-IF16C Conpact High Density Analog Current Input Module - Manual (Page 12)

12 Compact High-density Analog Current Input Module
Publication 1769-IN085A-EN-P - August 2008
System Wiring Guidelines
Consider the following when wiring your system:
•
All module commons (COM) are connected in the analog module.
•
The analog common (COM) is not connected to earth ground inside the
module.
•
Channels are not isolated from each other.
•
Use Belden 8761, or equivalent, shielded wire.
•
Under normal conditions, the drain wire and shield junction must be
connected to earth ground via a panel or DIN rail mounting screw at the
analog I/O module end. Keep the shield connection to ground as short as
possible.
(1)
•
To ensure optimum accuracy, limit overall cable impedance by keeping your
cable as short as possible. Locate the I/O system as close to your sensors or
actuators as your application will permit. (2)
•
If multiple power supplies are used with analog inputs, the power supply
commons must be connected.
•
The 1769-IF16C module does not provide loop power for analog inputs. Use
a Class 2-rated power supply that matches the input transmitter
specifications.
•
Voltages on the IN+ terminals of the 1769-IF16C module must be within
+/-10V DC of analog common.
(1) In environments where high-frequency noise may be present, it may be necessary to directly ground cable shields to earth
at the module end and via a 0.1 µF capacitor at the sensor end.
(2) Cable length over 50 m (164 ft) may impact accuracy. For details, refer to the Compact High-Density Analog Input Modules
User Manual, publication
1769-UM018.
ATTENTION
Be careful when stripping wires. Wire fragments that fall into a
module could cause damage at power up. Once wiring is complete,
ensure the module is free of all metal fragments.