PLC program for a batch process

Introduction

Hey guys in this session we are gonna discuss about a PLC program for a batch process.In my earlier posts i mentioned the basics of PLC so you can check that out by clicking the link below

https://automationforum.co/2018/02/programming-logic-devices-plc.html

so lets discuss about the program

batch process

 

Procedure

Automatically injects the container with liquids A and B in order when START is pressed. When it reaches the set level, mix the two liquids evenly and then open the valve to let the mixture out.

 

Number of PLC Inputs Required
X1 =Start Switch.
X1 = Low level float sensor. X1 = ON when the liquid level reaches X1.
X2 = High level float sensor. X2 = ON when the liquid level reaches X2.
X3 = Stop Switch.
X10 = EMERGENCY STOP button. X10 = ON when the button is pressed.

Number of PLC Outputs Required

Y0 = Liquid A Inlet
Y1 = Liquid B Inlet
Y2 = Mixture Outlet
Y3 = Agitator /Stirrer

PLC  program

ladder logic

 

PLC Ladder Program Description:

  • X0 = ON when START is pressed. Y0 will be ON and latched, and the valve will open to infuse liquid A until the level reaches the low level float sensor.
  • X1 = ON when the level reaches the low level float sensor. Y1 will be ON and latched, and the valve will open to infuse liquid B until the level reaches the high level float sensor.

 

  • X2 = ON when the level reaches the high level float sensor. Y3 will be on and activate the agitator. In addition, timer T0 will start counting for 60 seconds. After 60 seconds, T0 will be ON, and the Y3 agitator motor will stop working. Y2 will be ON and latched, and the mixture will drain out of the container.
  • When Y2 = ON, timer T1 will start counting for 120 seconds. After 120 seconds, T1 will be on and Y2 will be off. The draining process will stop.
  • When an error occurs, press the EMERGENCY STOP button X10. The NC X10 contact will be ON to deactivate all outputs. The system will then stop working.

You can do practice this logic diagram in one of free plc simulator software found in the internet the link is given below

https://automationforum.co/2018/03/basics-ladder-logic-plc-simulator-tutorial.html

https://automationforum.in/t/plc-simulator-free-download/3287

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