Rockwell Automation 1769-IR6 Compact I/O 1769-IR6 RTD/Resistance Input Module User Manual

Page 24

Rockwell Automation Publication 1769-UM005B-EN-P - March 2012

Chapter 2 Quick Start for Experienced Users

Follow the guidelines below when wiring the module.

General

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.

Power and input wiring must be in accordance with Class I, Division 2
wiring methods (Article 501-4(b) of the National Electric Code
NFPA70), and in accordance with the authority having jurisdiction.

Channels are isolated from one another by ±10V DC maximum.

Route field wiring away from any other wiring and as far as possible
from sources of electrical noise, such as motors, transformers,
contactors, and AC devices. In general, allow at least 15.2 cm (6 in.) of
separation for every 120V of power.

Routing field wiring in a grounded conduit can reduce electrical noise.

If field wiring must cross AC or power cables, ensure that they cross at
right angles.

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.

Use Belden shielded, twisted-pair wire to ensure proper operation and
high immunity to electrical noise. See the table below for recommended
types.

Keep cable shield connection to ground as short as possible.

Under normal conditions, the drain wire and shield junction should be
connected to earth ground, via a panel or DIN rail mounting screw at
the 1769-IR6 module end.

If noise persists for a device, try grounding the opposite end of the
cable. (You can only ground one end at a time.)

Step 3:

Wire the module.

Reference

Chapter 3
(Installation and Wiring)

Configuration

Recommended Cable

2-wire

Belden 9501 or equivalent

3-wire
less than 30.48 m (100 ft)

Belden 9533 or equivalent

3-wire
greater than 30.48 m (100 ft) or high humidity conditions

Belden 83503 or equivalent