Rockwell-automation 1769-OF4 Compact Analog Output Module Instrukcja Użytkownika Pobierz pdf (Strona 21)

Publication 1769-UM020A-EN-P - December 2009 21

Installation and Wiring Chapter 2

System Wiring Guidelines

Consider the following when wiring your system:

• All module commons (ANLG Com) are connected in the analog

module.

• The analog common (ANLG Com) is not connected to earth

ground inside the module.

• Channels are not isolated from each other.

• For 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.

• 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)

• Keep shield connection to ground as short as possible.

• Voltage outputs (Vout 0+…Vout 3+) of the 1769-OF4 module are

referenced to ANLG Com. Load resistance for a voltage output

channel must be equal to or greater than 1 kΩ .

• Current outputs (Iout 0+…Iout 3+) of the 1769-OF4 module

source current that returns to ANLG Com. Load resistance for a

current output channel must remain between 0 and 600 Ω .

(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 0.01 µF, 2000V capacitor at the sensor end.

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Rockwell-automation 1769-OF4 Compact Analog Output Module Instrukcja Użytkownika Strona 21