Rockwell-automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Instrukcja Użytkownika Pobierz pdf (Strona 21)

Publication 1769-UM019A-EN-P - October 2008 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.

• If multiple power supplies are used with analog inputs, the

power supply commons must be connected.

• The module does not provide loop power for analog inputs. Use

a Class 2 power supply that matches the input transmitter

specifications.

• Differential analog inputs are more immune to noise than

single-ended analog inputs.

• Voltage outputs (Vout 0+ and Vout 1+) of the 1769-IF4FXOF2F

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+ and Iout 1+) of the 1769-IF4FXOF2F

module source current that returns to ANLG Com. Load

resistance for a current output channel must remain between 0

and 500 Ω .

• Voltages on Vin+, V/Iin-, and Iin+ terminals of the

1769-IF4FXOF2F module must be within ±10V DC of analog

common (ANLG Com).

(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.

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Rockwell-automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Instrukcja Użytkownika Strona 21