Question on Page 28 of "PLC Tutor"

Day

Member
Join Date
Feb 2003
Location
CA
Posts
1
Hello! I am a new student. I have trouble in understanding on Page 28.
I don't understand why SW1 should be logic 1 ans SW2 must be logic 0.
I need your help to understand every line of page 28.
Expecting to hearing from you soon.
Have a great day.

Sincerely yours,
 

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