Rockwell Automation 1769-IT6 Compact I/O 1769-IT6 Thermocouple/mV Input Module - Manual (Page 25)

Rockwell Automation Publication 1769-UM004B-EN-P - March 2010 25
Installation and Wiring Chapter 3
Preventing Electrostatic Discharge
Removing Power
Selecting a Location
Consider reducing noise and power supply distance when selecting a location.
Reducing Noise
Most applications require installation in an industrial enclosure to reduce the
effects of electrical interference. Analog inputs 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 wiring away from any high
voltage I/O wiring.
ATTENTION: Electrostatic discharge can damage integrated circuits or
semiconductors if you touch analog I/O module bus connector pins or the
terminal block on the input module. Follow these guidelines when you
handle the module:
• Touch a grounded object to discharge static potential.
• Wear an approved wrist-strap grounding device.
• Do not touch the bus connector or connector pins.
• Do not touch circuit components inside the module.
• Use a static-safe work station, if available.
• Keep the module in its static-shield bag when it is not in use.
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.