The same sequence is followed by each side.The green light of each side is ON for 10 sec only one side at a time and the same time, the respected red light is ON for 30sec.We have to control the traffic of 4 roads.When the level in the tank falls below 10%, close the output valve.Įxample 4 Develop ladder logic for traffic control.when this temperature is reached, turn OFF the heater & open the outlet valve.
When the tank is filled, turn ON the heater to raise the temperature up to 70 deg. The fan may be turned OFF by pushing a separate fan reset switch.Įxample 3 Develop the ladder logic to fill the tank. if the saw has run more than 1 min, the fan should stay ON indefinitely. STOP push-button stops the saw only before fan stops it should run for an additional 5 sec to blow the chips away and also the tube pump is to run for 8 sec.A wood saw cutter (W), a fan (F) and a lubrication pump (P) turns on when a START push button is pushed.Finally, release this mixture through valve V2.Įxample 2 Develop a ladder program for wood saw cutter.After mixing & heating turn OFF the stirrer & heater.If a high level is reached turn ON the stirrer & heater at a time.Then check the level, is it high level is reached or not.On button to start the process when motor start and V1 is open.Example 1 To develop a ladder diagram for the ON/OFF temperature controller for the continuous process of heating of mixture.