#Pump ladder logic program how to#
I have the majority of the screens built for the project andI can do the basic ladder logic such as an input turns on an output.I also havesome of the ladder logic for the input and output level into the plant carriedout and it is working on the HMI screen.The main section that I am havingdifficulty with is to create the ladder code that will control the vsd thatchanges the speed of the rotors in the aeration tank.The vsd will be increasedif there are too high a proportion of solid particles.I was wondering wouldthere be example of how to control a vsd on the webinars or on the forums.Againany help is greatly appreciated and will be very beneficial in my continuouslearning. When you do write back, make sure you tell us what hardware model(s) you are working with since not all models of PLCs have all the functions and you might need a work around.įirstlythanks very much for the responce.Sorry I think that the above question mayhave been a bit too vague.I have already created the input and output lists forthe plant.I have also studied the excellent webinars provided and learned agreat deal from them.I must say the site is excellent and very user friendly.Iam still a bit of a beginner when it comes to using PLC’s but I am constantlyimproving and learning. Sorry for the lack of specific things to do but without at least a baseline in how to program we won't be able to help, we would only be able to write it for you and that would defeat the purpose of the project I think.Īfter you get started ask specific questions on items you need to know and I am sure all of us out here will be happy to give solid guidance. Start and stop the webinar as needed and I think it will really give you a leg up.
Watch all of these while you have your PLC with you and connected to your computer for programming and work along with the webinar. Start off by watching the bottom webinar on buttons and lights to get your feet wet, then timers and HMI jumps, then troubleshooting tips. Go to the webinars section in the "Support" tab. The boyscouts have a saying: "How do you eat an elephant?", "one bite at a time". Not to put too delicate a point on it but it sounds like you are lost at where to start. After that ladder logic is just picking the order and items you need to make things happen the way you want. Hopefully the PLC hardware you have has the IO you will need to get the job done.
The first thing to do is decide what inputs and outputs you are going to want to make your wastewater project live. We all have to start somewhere and welcome to the world of PLC programming.