This is a PLC Program for Latching and an unlatched circuit for output.
Problem Description
In some conveying systems, the operator fills the tank manually by operating the water pump manually.
In this situation operator waits when the tank is being filled because when the tank reaches to high level, the water pump should be stopped.
Also water pump should remain in ON condition until the tank reaches a high level.
For example, we consider a manual water conveying system in this article.
In this example, we consider one storage tank for water and use one water pump for tank filling.
We also use one level sensor for high level and control panel for operator.
Here START PB for enabling the motor so we can feed the water in the tank, for stop motor we use STOP PB.
Level sensor for detection of High level so when tank becomes full, high level sensor will be activated and stops the water pump.
For this sequence we will use SET and RESET instruction for latching and unlatching the water pump.
We can make this circuit by sing relays.
In application there one manual discharge valve only for discharging the tank manual. We will not consider in or logic.
Note: The above PLC Logic provided for basic idea about application of PLC Program for Latching and unlatching Circuit. The Logic is limited and not complete application.
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View Comments
Thank you .
These kind of examples help to learn PLC programming .Kindly continue and give harder examples.
excelente artigo!
Please help me for my activity. Its difficult like me as first timer.
Here is the problem.
When you press Push Button (PB1) - X21 the output bulb (YO) will lit... When you release the PB1 the output bulb will off.