I am looking to implement a ladder logic programme ((Mitsubishi GX Developer or

ID: 1714820 • Letter: I

Question

I am looking to implement a ladder logic programme ((Mitsubishi GX Developer or Trilogi) for the following

Consider the following chemical mixing process which is to be controlled by a PLC (Mitsubishi GX Developer or Trilogi)

the process control actions are

press the start button

if the tank is empty initially switch on supply pump1 for 50 sec and supply pump2 for 30 sec

if the tank is not empty initially stop the process automatically and indicate an alarm

activate a mixer paddle in the tank

after initially mixing of 20 sec switch on an element heater for 200 sec to heat the chemicals while still mixing

the element heater and the mixing paddle are then switched off and a discharge pump is activated to empty the chemical from the tank

pressing the stop button anytime will stop the process immediately

Inputs - start switch n/o spring return (x0) stop switch n/c spring return (x1) tank full level sensor (n/o) (x2) tank empty level sensor n/o (x3)

Outputs - supply pump1 (y0) supply pump2 (y1) mixer paddle (y2) discharge pump (y3) heater element (y4) alarm (y5)

first make the x0 high.

then check the status of x3

if x3=0

then

x1=1 & y5=1

else if x3=1

then

make y0=1 & y1=1

delay 30 sec

make y1=0

delay 20 sec

make y0=0

make y2=1

delay 20 sec

make y4=1

delay 200 sec

make y2=0 & y4=0

make y3=1

delay 10 sec

x1=1

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