Weight control system.

Weight control system.

Application:-There is one hopper in the system. Feed the material till set weight achieved. Write the PLC program so system can control automatically and stop the feeding valve when weight in the hopper is achieved. 

Explanation:-

As per above application, There is one hopper in the system and we need to feed material in the hopper. So for feeding the material we are using feeding valve here. When operator will start system, feeding valve will start to feed the material if material weight is less than 50 kg. When material weight is achieved, feeding valve will be stop automatically.

 

PLC program:-

Write the ladder program for above application using ladder diagram language. Here for ladder logic we can use any supported PLC system like S7-1200, S7-300, S7-1500 or any other PLC which can support this instruction. For PLC logic we need digital inputs and outputs.

For our application start, stop buttons is digital inputs and valve is digital output. So define digital input address and output address as per below explanation,

Digital inputs:-

Start=I0.0

Stop=I0.1

Digital Output:-

Feeding valve=Q0.0

PLC program Explanation:-

In network 1, we have used set coil for start operation of feeding valve. So when start button is pressed and weight is less than 50 kg, feeding valve will be start and feed the material in the hopper.

In network 2, we used reset coil for stop operation of feeding valve. So when weight is greater or equal to 50 kg, feeding valve will be off. And if stop button pressed, feeding valve will be off.