Rockwell-automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Uživatelský manuál stáhnout pdf (Strana 12)

12 Compact Combination Fast Analog I/O Module

Publication 1769-IN081A-EN-P - February 2007

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.

• 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-IF4FXOF2F module does not provide loop power for analog

inputs. Use a 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 1K Ω.

• 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+ of the 1769-IF4FXOF2F 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 0.1µF capacitor at the sensor end.

(2)

Cable length over 50 meters may impact accuracy. For details, refer to the Compact Combination Analog I/O Module,

publication 1769-UM008A-EN-P.

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.

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Rockwell-automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Uživatelský manuál Strana 12