![]() ![]() When 12 parts (stack) are placed on the conveyor, it turns ON and moves the stack at the position B.Ī sensor is used to stop the conveyor at B. stack height is controlled by PLC counter function. When the ON button is pushed, a stacker starts stacking plywood sheet at position A. 3 Way Traffic Light Control using PLC LogicĮxample 5 Develop ladder logic for an automatic paint process.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.
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