Rockwell Automation Allen-Bradley 1769-ASCII, User Manual

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Rockwell Automation Publication 1769-UM012B-EN-P - January 2014 13
Compact I/O ASCII Module Chapter 1
Install the Module Compact I/O is suitable for use in an industrial environment when installed in
accordance with these instructions. Specifically, this equipment is intended for
use in clean, dry environments (Pollution Degree 2
(1)
) and to circuits not
exceeding Over Voltage Category II
(2)
(IEC 60664-1).
(3)
(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that occasionally a temporary
conductivity caused by condensations is to be expected.
(2) Over Voltage Category II is the load level section of the electrical distribution system. At this level, transient voltages are controlled
and do not exceed the impulse voltage capability of the product’s insulation.
(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC) designations.
ATTENTION: Preventing Electrostatic Discharge
This equipment is sensitive to electrostatic discharge, which can cause internal
damage and affect normal operation. Follow these guidelines when you handle
this equipment.
• Touch a grounded object to discharge potential static.
• Wear an approved grounding wriststrap.
• Do not touch connectors or pins on component boards.
• Do not touch circuit components inside the equipment.
• If available, use a static-safe workstation.
When not in use, store the equipment in appropriate static-safe packaging.
WARNING: If you connect or disconnect the serial cable with power applied to
this module or the serial device on the other end of the cable, an electrical arc
can occur. This can cause an explosion in hazardous locations. Be sure that
power is removed or the area is nonhazardous before proceeding.
ATTENTION: This product is grounded through the DIN rail to chassis ground.
Use zinc-plated, yellow-chromate steel DIN rail to assure proper grounding.
The use of other DIN rail materials (for example, aluminum and plastic), which
can corrode, oxidize, or are poor conductors, can result in improper or
intermittent grounding.