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.

Operate two conveyors by given time.

Operate two conveyors by given time.

Application:-There are two conveyors in the system and we need to operate them in given time. Here conveyor 1 should be start first and second conveyor should be start after some time. Write PLC program for the system using ladder diagram language. 

Explanation:-

As per above application, there are two conveyors in the system and we need to operate them in sequence. So when start button is pressed conveyor 1 will be on and second conveyor will on after 10 second delay. In this case we need to use on delay timer because we are giving delay between two conveyors.

 

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 and stop buttons are digital inputs and conveyors are the digital outputs. So define digital inputs address and output address as per below explanation,

Digital inputs:-

Start button=I0.0

Stop button=I0.1

Conveyor 1 trip=I0.2

Conveyor2 trip=I0.3

Digital Output:-

Conveyor 1=Q0.0

Conveyor 2=Q0.1

PLC program Explanation:-

In network 1, we have used NO contact of start button (I0.0), so when button is pressed conveyor 1 (Q0.0) will be on immediately.

In network 2, we have used No contact of conveyor 1 (Q0.0) to operate conveyor 2 (Q0.1). Here we used on delay timer to provide delay between two conveyors.

NC contact of trip signal is used for safety of motor during the overload.

DOL motor starter operation

DOL motor starter operation

Application:-Make DOL starter logic in the PLC. Write PLC program for the DOL starter using ladder diagram language. 

Explanation:-

Generally in industry DOL starter is commonly used for motor control. In direct online starter, motor is controlled by start and stop button with fixed motor speed. In above diagram if start button is pressed, motor will be start by PLC and if stop button is pressed motor will be stop by PLC.

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 and stop buttons are digital inputs and valves are the digital output. So define digital input address and output address as per below explanation,

Digital inputs:-

Motor start=I0.0

Motor stop=I0.1

Motor trip=I0.2

 

Digital Output:-

DOL Motor=Q0.0

PLC program Explanation:-

In network 1, we have used NO contact of motor start button (I0.0) and NC contact of motor stop and motor trip feedback, so when motor start button is pressed DOL motor will be start and if stop button is pressed, motor will be stop.