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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