Why Use Normally-Closed Contact for Stop Buttons?
The main advantage of using normally-closed contact for stop buttons is to detect the wire breaks in the electrical circuits.
NORMALLY OPEN CONTACT ANIMATION
Normally-open and Normally-closed Switch Contacts
Perhaps the most confusing aspect of discrete sensors is the definition of a sensor’s normal status. Electrical switch contacts are
Equivalent Logic Gates using PLC Ladder Diagrams
Explain the basic digital logic gates circuit and boolean logic with PLC programming. Show the Equivalent Logic Gates using PLC Ladder Diagrams.