PLC Programming Tutorial for Beginners
In this lesson we will learn how to write a PLC program using an "S7 300” PLC and “STEP 7” software.
We have two pumps which are being used to transfer two separate liquids into this tank.Inside the tank there are two level switches installed in the lower and upper parts of the tank respectively.
There is also an electrically powered mixer inside the tank which starts working for a defined period of time, mixing the two liquids together after the tank has filled.
We also have a discharge valve in the bottom of the tank which controls the draining of the liquid from the tank.
When the level of the liquid drops to the level of the switch's position the contact closes, sending a 24 volt DC signal to the PLC input.
We want to write the program so that when the level of the liquid reaches this minimum, the pumps will be activated and begin filling the tank with the liquids.
The pumps continue filling the tank until the level reaches its maximum at the higher level switch. When this hap…
We have two pumps which are being used to transfer two separate liquids into this tank.Inside the tank there are two level switches installed in the lower and upper parts of the tank respectively.
There is also an electrically powered mixer inside the tank which starts working for a defined period of time, mixing the two liquids together after the tank has filled.
We also have a discharge valve in the bottom of the tank which controls the draining of the liquid from the tank.
When the level of the liquid drops to the level of the switch's position the contact closes, sending a 24 volt DC signal to the PLC input.
We want to write the program so that when the level of the liquid reaches this minimum, the pumps will be activated and begin filling the tank with the liquids.
The pumps continue filling the tank until the level reaches its maximum at the higher level switch. When this hap…