Rockwell Automation 1771-A2BSS_A3B1SS Install Instruc Universal I/O Chassis - Manual (Page 8)

N Y
Using
Power Supply
Module in
the Chassis?
12620-I
Universal I/O Chassis 8
Publication 1771–5.60 – May 1999
Ground Shielded Cables
Certain connections require shielded cables to help reduce the effects
of electrical noise coupling. Ground each shield at one end only. A
shield grounded at both ends forms a ground loop which could cause
faulty PLC-5 processor operation.
Ground each shield at the end specified in the appropriate
publication for the product.
Avoid breaking shields at junction boxes. Many types of connectors
for shielded conductors are available from various manufacturers. If
you do break a shield at a junction box:
connect only category-2 conductors in the junction box
do not strip the shield back any further than necessary to make a
connection
connect the shields of the two cable segments to ensure continuity
along the entire length of the cable
For more information about grounding the chassis, see Industrial
Automation Wiring and Grounding Guidelines for Noise Immunity
(publication 1770-4.1).
Set the power supply configuration jumper according to the power
supply you are using.
!
ATTENTION: If you do not properly configure the
power supply configuration jumper, the processor will
fail.
If you are using Set jumper to
a power-supply module or
a processor with an integral power supply
(1772-LSP, -LWP, -LXP or -LZP)
“Y” position
N Y
a power supply external to the I/O chassis
“N” position
N Y
Important: You cannot power a single I/O chassis with both a
power-supply module and an external power supply.
Set the Power Supply
Configuration Jumper