Programmable Logic Controller (PLC) Questions and Answers
This PLC is being used to start and stop an electric motor, and also to shut it down automatically if any of three “shutdown” conditions occur:
The status of each shutdown contact is as follows:
Draw a PLC ladder-logic program to start and stop this motor.
Be sure to make the program latching so that the operator does not have to hold the Start button to keep the motor running.
Answer:
Do you find any mistakes in the logic? Share with us through comments.
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Credits : by Tony R. Kuphaldt – under CC BY 1.0
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fantastic title
thanks
This is indeed a powerful source of information. I am truly humbled.
Thank you
Maphalla MA
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sorry, X1, X2, X3 should be NC Contacts here.
True...contacts must be closed there...open for TS
good idea
X0,X1,X2,X3, NEED TO NC contact
X1, X2, X3 all is NC Contact.
Stop , vibration, overload should be NC
No they should not. They are NC instruments yes but if you keep as NC in logic motor will not start as they will turn open in the logic