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I trust you are well. Guy I am looking for help in using a package called concept in writing PLC code. I will be writing code using Functional Body Diagram Programming. I want to write code for boiler water level control.

We have a Differential Pressure Cell and a Water Flow Meter as the new equipment we are adding which need to be part of the control philosophy. The philosophy is as follows, if the DP cell indicates a higher boiler pressure than a lower pump head increase the pump pressure, until pump pressure is greater than boiler pressure so as to ensure flow. We then use the water flow meter to always indicate that there is flow when flow is actually supposed to be occuring. Also if the water flow meter ever indicates absence of flow when flow is required ramp up the pump until the flow monitor indicates flow.

Any heads up

Thanks in advance


I would have more than one flow meter. You wouldn't want to keep increasing the pump pressure when a meter is malfunctioning. How are you setting up your DPC? What is it transmitting its data to?


Boiler level control schemes are well-established. Look up 3-element boiler level control on Google.

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