The heat comes ON for 10 sec and goes OFF.The mandrel makes contact with a limit switch at the top of travel.Lower limit switch actuation indicates that there is an object on the mandrel and that mandrel is down. The lower limit switch is getting actuated before the object will rise. A solenoid valve supplies this air to the pneumatic elevating cylinder. The object is raised from down to top by air pressure.Both left & right start-up buttons are pressed.Master PB is used to turn ON the process.PLC Programming for Automatic Box FillingД®xample 6 Develop ladder logic for Heat/Quench station.After painting, the conveyor starts manually and moves the stack to position C and stops automatically.

Paint is applied to 12.5 seconds duration.when it reaches position B, the sensor stops the conveyor by sensing the position. After 12 part stacking, conveyor starts and moves the stack to position B.ON button is used to start the process and stacker starts stacking.At point B, paint is applied for 12 sec after painting is completed, the conveyor restart s manually and moves to position C and stops automatically and stack is removed. When 12 parts (stack) are placed on the conveyor, it turns ON and moves the stack at the position B.ДЄ 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 LogicД®xample 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.Д®xample 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.Д®xample 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.Д®xample 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.

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