In an industrial unit four motors M1, M2, M3 & M4 are in operation .The system in
Figure below consists of four manual on/off switches S1, S2 , S3 & S4 (to turn on /off
motors respectively) And control logic and motor drive interface. Design a control logic
that performs the following operation
• All motor are not allowed to work at the same time.
• Motors M1, M2, M3 are allowed to work at the same time.
• Motors M2 & M4 cannot be operated at the same time.
• Single motor can be operated.
• Motors M3 & M4 cannot be operated at the same time.
• Motors M1 & M4 can work at the same time.
• Consider all other cases don’t care except the above.
• Remember that the controller must shut down all motors for the conditions that
are not allowed.
Please draw or write
1. Truth Table
2. Circuit Diagram
3. Optimal Circuit
4. Problem you faced

How to start solving this problem? please help! urgent

 

Start by drawing the truth table.

Why is this urgent? Have you been putting this homework off, and it's due now?

This should have been posted in the Homework Help forum.

 

The OP also has the exact same thread in the homework forum. One thread is enough.

http://forum.allaboutcircuits.com/showthread.php?t=60830