I have already shown the PLC program on ABB software above. I have written this traffic control system program on ABB, AB and Delta compact PLC software. But, you should know the rules of writing LD program. You can write a program on the different PLC software. Running Program on Different PLC Softwares And T3 is connected to the green lamp (Q3) for the 15 seconds.T2 is connected to the yellow lamp (Q2) for the 10 seconds.T1 is connected to the red lamp (Q1) for the 5 seconds.There are three timers (T1, T2.and T3) is connecting with the three output as per the duration or time requirement. This memory depicts input or output functions (or coil). It is used for latching process and to store extra energy supply. These three lamps (Q1, Q2, and Q3) are connected with the different timers (T1, T2, and T3), respectively. And Q3 is considered as the green lamp.The Q2 is considered as the yellow lamp.In the LD programming, there are three outputs (Q1, Q2, and Q3), considered as lamp or output coil. And PB2 is used for the stop the signal or emergency off purpose.īoth the inputs are connecting with the timers (T). The PB1 (I1) get NO (Normally Open) contact and PB2 (I2) get NC (Normally Closed) contact. In the PLC programming, the input (I) expresses as the push button (PB). Explaining each connected LD diagram components one by one.
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