I finished writing a Modbus Master Driver for the OpenPLC. It means that you can now use your Modbus Slave device as an I/O for the OpenPLC soft-core running in your PC. The driver supports Modbus TCP and RTU, although I haven't tested the RTU mode yet because I don't have any RTU device. I'll be happy if any of you can test it and report back if it worked. The instructions are fairly simple.

If you already have OpenPLC installed, you will need to remove it before installing the new version, or install it into a different directory. To remove, just open terminal (or cygwin terminal on windows) and type: rm -Rf OpenPLC_v2 Then follow the instructions on the website to install the OpenPLC in your platform (windows or linux). You don't need to download and install cygwin or nodejs again, but you will need to execute all the commands listed on the instructions again because there are new packets that are needed to be installed for this driver to work.

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Then, at the end of the build process, choose the Modbus driver (option 2). Finally, when you start the OpenPLC, you will notice a new field on the web interface. It's a place to upload the modbus configuration file. The OpenPLC must know how to connect to your modbus slave devices, and the parameters must be written in this file.

I've attached one example here, but you need to modify it in order to match your configuration. (PS: The forum doesn't support files with.cfg extension. After downloading it, you must change the extension from.txt to.cfg) The modbus configuration file is a text file that can be edited on any text editor (i.e.

Notepad on windows), and it's pretty much self-explanatory. Just edit the file with your configuration and upload it using the web interface. I'll post more detailed instructions later on the website. First I just need to know if it works well for your devices. Nmambre wrote: I just changed the IP to 127.0.0.1 and the port to 1502 to use a slave simulator on same machine. When I load the cfg I see in the terminal that it is started, but I don't see any query to the slave.

I loaded the HelloWorld example to the softplc (WinXP). Do I need to change anything else? You should see queries constantly. Which platform you are running the OpenPLC on? Can you try to start the OpenPLC manually and post here the output. To do it, just enter on the core folder inside OpenPLC_v2 and run the executable: (Linux) cd OpenPLC_v2 cd core sudo./openplc (Windows) cd OpenPLC_v2 cd core./openplc I've seen libmodbus having issues on some platforms.

To know if you're having issues I need to see the OpenPLC program output. Yesterday I discovered a problem with OpenPLC on the RaspberryPi. I fixed the code on github but you might have the old code. To fix it, just type: sudo ldconfig and then run OpenPLC again.

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It worked on my RaspberryPi B+, although I don't have a Pi2 to test. It should work as well.

I tested with this modbus slave tool (and it worked. Also, try running the OpenPLC manually (outside the webserver) to see the program output. There are some errors on the OpenPLC program that the webserver doesn't catch yet. To run it manually, just enter on the core folder inside OpenPLC_v2 and run the executable: cd OpenPLC_v2 cd core sudo./openplc Please post here your output when running the OpenPLC manually. Nmambre wrote: What are the naming conventions for Input and Holding registers? Which means that%IX0.0 to%IX0.7 -> the first 8 digital inputs (modbus discrete input)%QX0.0 to%QX0.7 -> the first 8 digital outputs (modbus coils)%IW0.0 to%IW0.n -> the first n analog inputs (modbus input registers)%QW0.0 to%QW0.n -> the first n analog outputs (modbus holding registers) You can have more than 8 digital inputs and outputs, but to access them you'll need to use the second group:%QX1.0 and so on.

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