In industrial automation the "hello world" program is a mixing tank. As a part of my portfolio I have written a simple mixing tank controller and a simulator. The project is meant for begginers and for educational purposes. It is published under MIT license. Written in CODESYS 3.5 and in structured text language.

The repository consists out of a CODESYS 3.5 project file, its generated PlcOpenXml and the serialized data in the docs folder.

• The codesys file can be opened with CODESYS and ran there.

• On different platforms than CODESYS the PlcOpenXml file can be used to import the data as no CODSYS native functions have been used in the project.

• Finally the user can read the code in markdown format located in this repository under docs folder or from this link

There are two ways of operation:

• Manual

• Automatic

• Operator is able to operate each valve manually

• Operator is able to operate the mixer motor manually

• Overfill protections are disabled

• Operator is able to put the system to auto

• Program will automatically control the valves and the mixing motor if system is in auto

• If the tanks level is undefined it assumes draining state

• In draining state, drains the tank until LS02 activates (tank is empty)

• When tank is empty, it activates the medium 1 and 2 valves, closes the drain valve and the tank is filling up

• Filling state is until LS01 is activated (Tank is full)

• Then the mixer motor is mixing for 10 seconds

• After mixing is completed, drain the whole contents

• Repeats as long as auto is activated

• Manual / Auto needs to be correctly controlled and displayed

• If manual, clicking on devices activates or stops them

• If auto, clicking is not doing anything

• If auto, system is counting number of cycles completed

• Devices must clearly display if they are activated or deactivated

The project is designed in a way that the user can disable the main program and replace it with his own implementation. Simulator and the HMI sees only the IO and HMI global variables so if the user wishes to create an own implementation those variables should be written. On the simulator side the operator can see if the implementation is working correctly.

This project is meant as a tutorial and as it it can be used under the MIT license.