Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual download pdf (Page 26)

Publication 1769-UM014B-EN-P - May 2010

2-10 Installation and Wiring

System Wiring Guidelines

Consider the following when wiring your system.

General Guidelines

 Channels are isolated from each other.

 Do not use the analog module’s NC terminals as connection points.

 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.

 Use Belden 8761, or equivalent, shielded wire.

 Keep shield connection to ground as short as possible.

 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.

(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 0.1µF capacitor at the sensor end.

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Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual Page 26