Rockwell Automation 1769-IF4I CompactLogix Isolated Analog Input Module - Manual (Page 10)

10 CompactLogix Isolated Analog Input Module
Publication 1769-IN074C-EN-P - March 2011
7. Slide the replacement module into the open slot.
8. Connect the modules together by locking (fully left) the bus levers on the replacement
module and the right-side adjacent module.
9. Replace the mounting screws (or snap the module onto the DIN rail).
Replacement Part
Terminal block, catalog number 1769-RTBN18 (one per kit).
System Wiring Guidelines
Consider the following when wiring your system:
• Do not use the analog module’s NC terminals as connection points.
• Channels are 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.
•
If multiple power supplies are used with analog inputs, the power supply commons must
be connected.
• The 1769-IF4I 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.
ATTENTION: Use supply wires suitable for 20 °C (68 °F) above surrounding
ambient.
(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.