Build the ladder logic example with Timers to turn ON/OFF the lamp using push buttons with respect to program logic conditions.
Note: Process should continue until stop PB is pressed
Latching rung to operate the system through Master Start and Stop PB.
Latched B3:0/0 is connected with T4:0 which starts running. Normally closed contact of T4:1 timer done bit is connected to make the process continue until stop PB is pressed.
Greater than or equal and Less than or equal block is connected in series with Q1 (O:0/0),When accumulator value between 0 to 5 triggers Q1 turns ON.
Greater than or equal and Less than or equal block is connected in series with Q2 (O:0/1),When accumulator value between 6 to 10 triggers Q2 turns ON.
Greater than or equal and Less than or equal block is connected in series with Q3 (O:0/2),When accumulator value between 11 to 15 triggers Q3 turns ON.
Greater than or equal and Less than or equal block is connected in series with Q4 (O:0/3),When accumulator value between 16 to 20 triggers Q4 turns ON.
When T4:0 accumulator value reaches 20,outputs Q5.Q6,Q7 & Q8 turns ON along with timer T4:1 which presets for 20 second. Limit block is used turn OFF each output in respective sequence.
Each Limit block check with T4:1’s accumulator value, when it’s not in the limit its triggers the output to turn OFF.
The above explained ladder logic for lamp turn ON/OFF is for example only. We can use this example program to understand the working of Push Buttons, Timers and Limit block in Allen Bradley PLC.
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