Rockwell Automation 1769-IF4XOF2 Compact Combination Analog Module - Manual (Page 8)

8 Compact™ Combination Analog I/O Module
Publication 1769-IN057A-EN-P - July 2001
Module Spare/Replacement Parts
•
Terminal block, catalog number 1769-RTBN18 (1 per kit)
•
Door, catalog number 1769-RD (2 per kit)
Field Wiring Connections
Grounding the Module
This product is intended to be mounted to a well-grounded mounting surface such
as a metal panel. Additional grounding connections from the module’s mounting
tabs or DIN rail (if used), are not required unless the mounting surface cannot be
grounded. Refer to Industrial Automation Wiring and Grounding Guidelines,
Allen-Bradley publication 1770-4.1, for additional information.
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-IF4XOF2 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.
(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.