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.Off delay timers are ON for fixed period of time after turning OFF input.ON delay timer which becomes ON after a particular time delay.There are number of different forms of timers that can be found in PLCs. For this problem we will use IEC timers (TON, TOF, TP &TONR) in S7-1200 PLC with examples.
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