I need help with these post lab questions: Design a start-stop circuit that util
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Question
I need help with these post lab questions:
Design a start-stop circuit that utilizes the PLC to read all button inputs and to send the output signal to the starting relay. Include a delay of 5 seconds after the stop button is pressed before the output is turned off. Include a delay of 5 seconds after the start button is pressed before the output is turned on. EE6120 Students Remove the necessity to hold down the buttons for the delay. Setup and use the PLC emulator to develop your code and demonstrate operation to the lab instructor. Modify the program, as necessary, to be loaded on the physical PLC Demonstrate proper operation of the complete system to the lab instructor. The Emulator has been configured on the laboratory computers. If there are issues see the lab instructor or refer to the setup documentation included in the lab files on pilot. Prepare a lab report as prescribed in the lab report template handed out on the first week. What would be a possible benefit of using the PLC in the system over the relay system? What would be a disadvantage? What would be a possible real world application for this kind of setup? In real life we place the stop button before the start in the circuit. Is this required in the logic setup? Why or why not?Explanation / Answer
Benefit of using PLC in the system over the relay system?
PLC stands for Programmable Logical Circuit and it is a solid-state, computerised industrial controller to perform discrete or sequential logic operations.
Relay systems are the normal circuits which we design by using relays and fuses and the connections are made using connecting wires.
Advantages of PLC used in system over relay systems:
Disadvantages of PLC:
What would be a possible real world application for this kind of setup?
A lift or an elevator will be the real world example that will satisfy the given conditions. When a start button or when the number key to which floor to go is pressed the lift doesn’t start immediately but takes some time depending on the preset value (here we give 5 sec) similarly when we press stop button the lift or elevator won’t stop immediately it will take some time to reach the nearest floor or the time given in the predetermined time (here delay is 5 sec).
Before starting the operation the start-stop circuit will read all the inputs and send the output to the relay. For example if 2, 5 numbers are pressed in the lift then the circuit will collect the data from the both switches and gives the output to the starting relay.
In real life we place the stop button before the start in the circuit. Is this required in the logic setup?
In logic setup there is no need of placing a stop button before a start button.
For a stop button we generally use NO (Normally Open) button which means it always open normally and closed only when the circuit is turned on.
If we place a stop button before a start button in logical setup there will be no power for the circuit to turn on and it will never turn on unless the stop button in removed. So we should never place a stop button before a start button in a logical setup.