Automatic heating and mixing process of two materials (S7-300 LAD).

Automatic heating and mixing process of two materials (S7-300 LAD).

This is PLC Program for automatic heating and mixing process of two materials.

Problem Description

 

Two material are collected in a tank and mixed till it achieves set temperature. Make ladder diagram logic for this automatic process.

 

Problem Diagram

 

Problem Solution

We can solve this logic by simple PLC ladder language. For this technique take into account 2 separate level switches to sight the extent of 2 completely different materials (Material 1&material 2).

 

Also take into account one level switch for empty level detection.

For dominant the extent we will use single acting valve (fully open and totally close).For mixing, mixer is employed and it's connected with motor shaft.

Heater and temperature device square measure put in within the tank. Here materials square measure mixed till it reaches the point of temperature and once combining discharge valve (Q0.4) are going to be operated to empty the mixed materials.

 

Program

Here is PLC program for automatic heating and mixing process of two materials.

 

List of Inputs/Outputs

Inputs List:-

Cycle START button:-I0.0

Cycle STOP button:-I0.1

Level of material 2:-I0.2

Level of material 1:-I0.3

Empty level SW:-I0.4

Temp sensor:-I0.5

Outputs List:-

Material 1 valve:-Q0.0

Material 2 valve:-Q0.1

Agitator motor:-Q0.2

Heater:-Q0.3

Discharge valve:-Q0.4

M Memory:-

M0.0=Master coil.

 

 

 

Ladder diagram for automatic heating and mixing process of two materials.

    

 

 

Program Description

Network 1 shows simple latching circuit for cycle ON and cycle OFF. Cycle can be started by pressing cycle START button (I0.0) and can be stopped by pressing cycle STOP button (I0.1).

In network 2 material 1 valve (Q0.0) is operated. When empty level SW (I0.4) is detected or cycle start button is pressed, material 1 valve (Q0.0) will be ON.

In network 3 material 2 valve is operated. When level of material 1 (I0.3) is detected, material 2 valve (Q0.1) will be ON.

In network 4 heater and agitator motor are operated. When level of material (I0.5) is detected, heater (Q0.3) and agitator motor (Q0.2) will be ON.

In network 5, when temp sensor (I0.5) is detected, discharge valve (Q0.4) will be ON.

 

 

Note:-Application is only for learning and educational purpose .Above application may be different from actual application. This application can be done in other PLC also. Users are responsible for correct operation of the PLC system and for any possible injuries and or material damages resulting from the use of this program. It is necessary to take care of safety during implementation, installation, maintenance and operation.

 

All parameters and graphical representations considered in this example are for explanation purpose only, parameters or representation may be different in actual applications. Also all interlocks are not considered in the application.