PLC Homework Lab Exercises
1 – Step one: Design a start stop station; include a green ready light, a red run light, and also a fan for a motor. Then using set and reset coils design a fault that includes an alarm and an indicator light. Make the system to which the alarm can be silenced by another button or switch but the indicator light remains on.
– Step two: Redesign the circuit to where the stop button resets the fault, turning off both the alarm and the indicator light
2. –Step one: Make start and stop station. Needs a fan, ready light and run light.The motor can only be started once in a 20 second period but after the 20 seconds you will be able to start it again.
–Step two: Redesign the program to where if the motor is started more than two times within the 20second cycle it will lock out until you hit the reset, or the timer times out. (Motor will not start again until you hit the reset or the timer resets)
3. –Step one: Design a start/stop station that can be started and stopped. When the program is started it will sound an alarm immediately for 5 seconds. Then 1 minute after the alarm it will sound again for 5 seconds. Then 2 minutes after the alarm sounds it will sound again for 5 seconds. This will continue in this order until the stop button is pushed. Include a ready light that will be on when the trainer is turned on, and a run light that is on whenever the program running.
– Step two: Alarm 5 seconds then, 1 minute after the alarm it sounds again for 5 seconds. Then 2 minutes after that alarm it will sound again for 5 seconds. Then it starts over going 1 minute to 2 minutes.
4. – Step one: Design an engine shutdown program that can be started and stopped. This circuit must include a ready light, run light, motor, pre-lube, post-lube, and fault with fault light. When started it will pre-lube before the motor starts, when it is stopped it will post-lube until post-lube is timed out. The post lube turns on after the fault has occurred. Once the fault occurs it shuts the motor down and turns on the post-lube. The Fault will be indicated with a light. Once post-lube has stopped the fault lights should remain on. In order to restart the circuit you must reset the faults to clear them.
– Step two: Redesign the circuit to where it only shuts down after a second fault is tripped. A light indicates that the second fault as it does the first. Remember you must be able to reset all faults before restarting the circuit. the first fault must be engaged before you can trigger the second fault.
5. – Step one: Design a ladder logic circuit that will do the following:
1. Pre-lube (Q5) for 5 seconds.
1. Sound an alarm (Q7) for 5 seconds after the pre-lube.
1. Open suction valve (Q2) after alarm sounds.
1. Engage the starter (Q1) 2 seconds after you open suction valve.
1. Activate the ignition system (Q3) 2 seconds after the starter is engage.
1. Open the fuel valve (Q4) 2 seconds after the ignition is on.
1. Look for an rpm input to disengage the starter (I5).
1. Start the fan (Q6).
1. Can be started and stopped.
· Step two: Redesign the circuit a ladder logic circuit that will do the following while shutting down:
1. Close the fuel valve.
1. 2 seconds later deactivate the ignition system.
1. 1 second later stop the fan.
1. Post lube (Q5).
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