Open source plc
Open source plcСкачать файл - Open source plc
My goal is to find vulnerabilities in PLCs and try to fix them. Therefore, due to the lack of open source tools available in this field, I decided to create my own open source PLC. The OpenPLC is a complete package with an editor and a compiler. The editor runs in Windows, Linux and MacOS and supports all the 5 IEC languages: ST, IL, LADDER, FBD and SFC. The compiler is responsible for getting the program written by the user and compile it to the platform in which the OpenPLC is running. The OpenPLC currently runs on Raspberry Pi, Arduino, UniPi and also as a soft-PLC on Windows or Linux. If you guys have any of the mentioned boards laying down somewhere, it might be interesting to give the OpenPLC a try. Open source PLC PLC Programmable Logic Controllers.
Open source PLC
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Arduino as a programmable logic controller (PLC)
The PLC Programmable Logic Controller has been and still is the basic component of the industrial automation world. The Industrial application made the PLC systems being very expensive, both to buy and repair, and also because of the highly specific skills requested to software designers to extract the maximum potentials from controllers. To turn Arduino into a Programmable Logic Controller, there are two approaches. The first one is to write our program using KOP language ladder. To do that, we must use two more applications in addition to Arduino IDE: The second method is to use plcLIB a library we suitably modified to take advantage of the IO shield coupled with Arduino UNO so that you can edit our project code with a language similar to AWL instructions: As an example to understand how to take full advantage of the two methods described above, we will try to solve a problem of home automation found on the web: Then we will proceed with a step-by-step explanation of the two methods described above. Briefly, we want to control the sunshades so that in case of a strong wind they must be automatically retracted, while unrolled only after the wind has calmed down. The behavior should be similar for the different lighting situations: As a possible solution we could use a real PLC, but given the simplicity of the algorithm and the high cost of that PLC, we will use the hardware shown above. We will use two sensors, twilight NO normally open and wind NO that will be connected to the IO shield. In addition, we will have to adapt and change the power scheme of the sunshades engines so that Arduino could manage them. Before writing the ladder code contact diagram , similar to that in figure, we need to download the LDmicro executable from the link http: Once downloaded and saved to your desktop, just double click on the LDmicro icon. Now, before proceeding with the application of ladder diagram, we have to write a draft of the program that we want to create. Since the program is very simple and we use few variables only, we can use the most basic and immediate programming approach for the PLC: This methodology consists of simple Boolean equations that will always return as output after the equal sign a value that can be 0 or 1. The only operators used will be the AND series , the OR parallel and NOT negation. The software adds this letter automatically during the coding. Once declared the variables, we can proceed on writing the logic equations, taking into account that Arduino with our shield reads all inputs as HIGH 1 when the contact is open and LOW 0 when the contact is closed: Now that we have our Boolean equations, we can back to LDmicro. By doing this we have added two more contacts, in series with the two parallel previous ones. Now we need to modify all contact names accordingly to those used in the equations. To do this we simply double click on the first Xnew contact we have created, then we set the name and contact type in the pop-up shell. Then we need one-step further. Copy and paste this code to a new notepad file, saving it with the following parameters:. In this file, we have to declare the names of our variables and the respective pins. This step may also be skipped but we do not guarantee proper operation of the program without. The changes to this file are closely related to our project and must be consistent with the ladder. Now we can move our four files 1. Then move this folder to W7 C: Open or restart the Arduino IDE and write the following code NOTE: Now, type the following code, which is valid for all projects similar to this:. We should get a positive result, if not please follow again the instructions above systematically. Now you just have to interface your system, respecting the logic that we have established for inputs and outputs. In case you want to keep it, just rename it and save it in another directory. For more information and further clarifications, please connect to the site http: Even in this case, our discussion will be mainly focused on digital logic without using special functions even if, respect to LDmicro example above, in this case we could easily take advantage of certain features such as timers. Once you have imported our library as described above we will not have to change it, regardless of the project we are going to realize. Just edit our code taking into consideration some factors:. By reusing the Boolean equations listed above, we write our code in the Arduino IDE: Once you have edited this code, simply click on Verify and wait for the IDE to compile the sketch: Wait until the loading is completed and CONGRATULATIONS! You have turned your Arduino to PLC. You can save your sketch without changing the library: In fact, a good programmer is someone who is able to create a good product regardless of the SDK or GUI he is using: The notions taken from this site are valid only if you used the original library found at the link below so that all special functions are available and explained. However, we guarantee that the timerOn function works fine we tested it successfully. If you wish to try all the other functions, you may download the original library and follow the step-by-step instructions from the linked website. In figure , you see the wiring diagram of sensors and the motor of the sunshade V single-phase motor with two-way rotation versus. Since the wiring diagram have been used for potentially hazardous voltages, we take no responsibility in case of accident, injury to persons or property resulting from a misinterpretation of the wiring diagram or by any inopportune change from your side. To follow this example, please download a library that was suitably modified. In this section, we deviate a little from the world of electrical engineering and automation PLCs and take a step towards electronics. We propose a second plcLIB library we suitably modified to take advantage of our IO shield so to have three digital inputs, three PWM outputs, six inputs and six analog outputs. Unzip the file PlcLIB. If you installed the library indicated in the previous path, you have to cut and paste it into another directory to avoid conflicts with this keep it if you want to create a purely digital project, you shall use the library specified in the methodology 2. Here is an example application; we want to dim a led L1; AY1 according to the value assumed by potentiometer R1; AX1 in real time. The Arduino solution, easily understandable after studying previous paragraph, is shown on listing:. After verifying the code, we can upload to Arduino and…. You succeeded in interfacing the analog world with Arduino-based PLC!! You can also check this more reliable and robust shiels; http: Try to convince my old boss using circuit cards are the way to safe big bucks than spending money on PLC logic. En un PLC el proceso es en paralelo mientras que usted presenta el proceso es en serie. Merry Christmas and a Open New Year Open Electronics. Raspberrypi Arduino and kits Pearltrees. Hi Sir- I found a company called SG Tronic that builds Arduino based PLCs. We decided not to wait and to design our own instead: Would you be interested in trading hardware for some development work? The housing is safe, the software amazing and I can use directly 0. Actually UPSat is already in orbit. Disculpe si peco de ignorante por malinterpre Would it be possible to somehow join two boar Our mission is to become a reference Open Source hacking site with ideas and feedback aimed to enrich the community. Blog About 3Drag 3DPrinter Projects Contest Submit! A practical example As an example to understand how to take full advantage of the two methods described above, we will try to solve a problem of home automation found on the web: LDmicro Before writing the ladder code contact diagram , similar to that in figure, we need to download the LDmicro executable from the link http: Input and Output variables in our program shall be the following: The whole procedure shall be repeated for all the remaining contacts and equations. Copy and paste this code to a new notepad file, saving it with the following parameters: Arduino Shield homefeatured KA05 newsline plc Remote control. Related Posts The Torpedo 2: Python for Professional IoT Development is now reality with Zerynth. Hacking an IKEA Lack Table into a Display. How can you make the arduino more rugged for a small plant? OpenSource Products The Torpedo 2: Posted 16 hours ago 0. Posted 3 weeks ago 0. Posted 4 weeks ago 0. Posted 1 month ago 1. 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Small Brick Open Source PLC
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