Rockwell Automation 1771-IND series C INSTL INSTR AC/DC INPUT MODULE - Manual (Page 3)

Digital ac/dc (24V) Input Module 3
Publication 1771-IN052B-EN-P - April 2006
Environment and Enclosure
Before You Begin
This module must be used with a 1771 Series B I/O chassis. If you are using a 1771-ASB
remote I/O adapter, you may use any combination of I/O modules. Otherwise, make sure no
other input module or single-card block-transfer module is placed in the same I/O group.
This module contains input filtering to limit the effects of voltage transients caused by
contact bounce, or radiated electrical noise, or both.
Power Requirements
Your module receives its power through the 1771 I/O chassis backplane from the chassis
power supply. The module requires 250 mA from the output of this supply. Add this to the
requirements of all other modules in the I/O chassis to prevent overloading the chassis
backplane or the backplane power supply.
ATTENTION
This equipment is intended for use in a Pollution Degree 2 industrial environment, in
overvoltage Category II applications (as defined in IEC publication 60664-1), at
altitudes up to 2000 meters without derating.
This equipment is considered Group 1, Class A industrial equipment according to
IEC/CISPR Publication 11. Without appropriate precautions, there may be potential
difficulties ensuring electromagnetic compatibility in other environments due to
conducted as well as radiated disturbance.
This equipment is supplied as open-type equipment. It must be mounted within an
enclosure that is suitably designed for those specific environmental conditions that
will be present and appropriately designed to prevent personal injury resulting from
accessibility to live parts. The interior of the enclosure must be accessible only by the
use of a tool. Subsequent sections of this publication may contain additional
information regarding specific enclosure type ratings that are required to comply with
certain product safety certifications.
See NEMA Standards publication 250 and IEC publication 60529, as applicable, for
explanations of the degrees of protection provided by different types of enclosure.
Also, see the appropriate sections in Industrial Automation Wiring and Grounding
Guidelines, Allen-Bradley publication 1770-4.1, for additional installation requirements
pertaining to this equipment.