EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
EBK LOGIXPRO PLC LAB MANUAL FOR PROGRAM
5th Edition
ISBN: 8220102803503
Author: Petruzella
Publisher: YUZU
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Chapter 6, Problem 2RQ

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Operating difference between a normally open and a normally closed relay contact:

Normally open relay contactNormally closed relay contact
Normally open relay contacts are said to be open when no current flows through the coil.Normally closed relay contacts are said to be open when the coil is energized.
They are said to be closed when the coil is energized.They are said to be closed when the coil is de-energized.
The relay contacts will be initially open to each other until the coil is energized or de-energized. It means that the movable contacts and fixed contacts will not be in any touch...

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