Rockwell-automation 1769-OF8V CompactLogix Analog Output Module Manuale Utente Scaricare il pdf (Pagina 12)

12 CompactLogix Analog Output Module

Rockwell Automation Publication 1769-IN089A-EN-P - March 2011

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.

• Current outputs (Iout 0+ to Iout 7+) of the 1769-OF8C module source

current that returns to ANLG COM. Load resistance for a current

output channel must remain between 0…500 Ω.

• Voltage outputs (Vout 0+ to Vout 7+) of the 1769-OF8V module are

referenced to ANLG COM. Load resistance for a voltage output

channel must be equal to or greater than 1K W.

WARNING: EXPLOSION HAZARD

All wiring must comply with N.E.C. article 501-4(b).

(1) In environments where high frequency noise may be present, it may be necessary to ground the shield

via a 0.1µF capacitor at the load end and also ground the module end without a capacitor.

IMPORTANT

To comply with UL restrictions, this equipment must be powered from a

source compliant with Class 2 or Limited Voltage/Current.

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Rockwell-automation 1769-OF8V CompactLogix Analog Output Module Manuale Utente Pagina 12