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PLC Practice Problems

PLC Practice Problems - Remember if he ties one button down...

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EE369 – Industrial Automation PLC Practice Problems 1. Develop a 24-hour digital clock that keeps track of hours, minutes and seconds. (Hint. Increment a counter every 60 seconds and another counter every minute.) 2. When a motor is turned off because of an overload fault, keep track of the accumulated downtime and the number of times the overload fault occurs within a 24-hour period. The count is reset after every 24 hour period. 3. Design a control circuit for an anti-tie down start where the operator must hold his hands on both palm ‘Start’ pushbuttons before the motor will start.
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Unformatted text preview: Remember, if he ties one button down, the other button will not start the machine. You may have to use timers. 4. A boiler has a N.C. high temperature safety switch. When the high temperature safety switch opens, sound a horn with two short blasts and one long blast. (1 second on, 1 second off, 1 second on, 1 second off, 3 seconds on 2 seconds off then repeat the cycle.) Turn the horn off when the temperature switch resets and a N.O. acknowledge pushbutton is pressed. R. Khan Nov. 2009...
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