Rockwell Automation 1769-IF4FXOF2F Compact Combination Fast Analog I/O Module - Manual (Page 15)

Publication 1769-UM019A-EN-P - October 2008 15
Installation and Wiring Chapter 2
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 and outputs reduces 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 that 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 wiring away
from any high-voltage I/O wiring.
Protecting the Circuit Board from Contamination
The printed circuit board of the module must be protected from dirt,
oil, moisture, and other airborne contaminants. To protect the board,
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.
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.