Here we see first of many weird things happening in the quantum world – particle can not have any value for kinetic energy, only some of discrete numbers. Only those energies E for which is zero are taken in consideration and represent valid state of the particle. I have always been amazed by the wonders of quantum world and always looked for the ways of grasping its significance. One really illustrative example of the quantum phenomena is called a finite square well, and here I present my solution of this popular problem solved in the numerical computation package of Python.įinite square well, what does it mean? Actually it’s quite simple to comprehend – a finite square well is a one-dimensional function V(x) which has a constant value V 0 everywhere except where |x| >L), is put into the separate list whose roots (places where it crosses zero) are to be found. The MOTOR 4(Q0.2) will remain ON, even when the input status changes back to 0.The Reset (I0.4) is necessary to reset the timer or accumulated time.Ah, quantum mechanics, inscrutable and stupendous way of doing physics and yet, no-one knows why it works. In this network we have used accumulator timer (accumulator time) for MOTOR 4(Q0.3).When the status of the SWITCH 4(I0.3) changes from 0 to 1 the timer instruction will be executed and MOTOR 4(Q0.3) will start after 10s. In this case even new positive edge is detected, the status of the MOTOR 3(Q0.2) is not affected as long as programmed time (PT) is running. When the status of the SWITCH 3(I0.2) changes from 0 to 1 the timer instruction will be executed and it will activate the MOTOR 3(Q0.2) immediately. In this network we have used pulse timer (generate pulse) for MOTOR 3(Q0.2).
When the status of the SWITCH 2(I0.1) changes from 0 to 1 the timer instruction will be executed and it will activate the MOTOR 2(Q0.1) immediately.Īlso when the SWITCH 2(I0.1) status changes back to 0 then programmed time (PT) will start and after time MOTOR 2(Q0.1) will be OFF. In this network we have used off delay timer (generate off delay) for MOTOR 2(Q0.1). When the status of the SWITCH 1(I0.0) changes from 0 to 1 the timer instruction will be executed and it will activate the MOTOR 1(Q0.0) after 10s delay. The ET output is reset as soon as the signal state at the IN input changes to 0. The timer value starts at T#0s and ends when the value of duration PT is reached. You can monitor the current time value at the ET output of the Timer block. The instruction is started when the result of the input IN changes from 0 to 1 (positive edge). We can use the Generate-ON-delay or ON delay timer instruction to delay setting of the Q output by the programmed duration PT. MOTOR 4 :- Q0.3 PLC Ladder diagram for Timers.third motor will start with pulse and off with 10s delay.second motor start immediately and off after 10s delay and.First motor will start after 10s delay,.We need to start three motors in different ways. Here consider example of four motors and four SWITCHES for explanation of timers. Accumulator timer is which records time interval.Pulse timer switches ON or OFF for fixed period of time.