Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual download pdf (Page 20)

Publication 1769-UM014B-EN-P - May 2010

2-4 Installation and Wiring

Remove Power

Reduce Noise

Most applications require installation in an industrial enclosure to reduce the

effects of electrical interference. Analog inputs and outputs are highly

susceptible to electrical noise. Electrical noise coupled to the analog inputs will

reduce the performance (accuracy) of the module.

Group your modules to minimize adverse effects from radiated electrical noise

and heat. Consider the following conditions when selecting a location for the

analog module. Position the module:

 away from sources of electrical noise such as hard-contact switches,

relays, and ac motor drives.

 away from modules which generate significant radiated heat, such as the

1769-IA16 module. Refer to the module’s heat dissipation specification.

In addition, route shielded, twisted-pair analog input and output wiring away

from any high-voltage I/O wiring.

Protect the Circuit Board from Contamination

The printed circuit boards of the analog modules must be protected from dirt,

oil, moisture, and other airborne contaminants. To protect these boards, the

system must be installed in an enclosure suitable for the environment. The

interior of the enclosure should be kept clean and the enclosure door should

be kept closed whenever possible.

System Assembly

The module can be attached to the controller or an adjacent I/O module

before or after mounting.

ATTENTION

Remove power before removing or inserting this module.

When you remove or insert a module with power applied,

an electrical arc may occur. An electrical arc can cause

personal injury or property damage by:

 sending an erroneous signal to your system’s field

devices, causing unintended machine motion.

 causing an explosion in a hazardous environment.

Electrical arcing causes excessive wear to contacts on both

the module and its mating connector and may lead to

premature failure.

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Rockwell-automation 1769-OF4VI Compact I/O Isolated Analog Modules User Manual Page 20