Asked by Le'Aisha Marshall on May 08, 2024
Verified
Normally closed stop buttons are always entered as normally closed contacts on a PLC.
Normally Closed
A term used to describe a switch or contact configuration where the default state is making contact (closed), allowing current flow until actuated to open.
Stop Buttons
Manual control devices used to halt machine operations or processes, typically as a safety or emergency measure.
PLC
Stands for Programmable Logic Controller, a digital computer used for automation of electromechanical processes, such as control of machinery on factory assembly lines.
- Determine and delineate the role of different ladder logic symbols and instructions.
- Identify the differences between contacts and coils types utilized in ladder logic.
Verified Answer
NW
Normandi WilliamsMay 12, 2024
Final Answer :
False
Explanation :
Normally closed stop buttons are typically entered as normally open contacts in a PLC program to ensure that the circuit is active (allowing the PLC to run) when the button is not pressed, and the circuit becomes inactive (stopping the PLC) when the button is pressed. This is a safety design principle to ensure that any failure in the button (e.g., wire break) results in the machine stopping.
Learning Objectives
- Determine and delineate the role of different ladder logic symbols and instructions.
- Identify the differences between contacts and coils types utilized in ladder logic.