The starting address is 40001, and there are a number of possibilities when it comes to structuring our data. Now we are ready to create our Holding Registers. Choose a Data block, name it something along the lines of Holding_Registers, ensure it is a Global DB, and click OK. Once again in the Project tree under Program blocks, double click Add new block. Now it’s time to create the Holding Registers. For each field, open your Modbus_Config data block and choose the corresponding field that you created. By double clicking each input/output field for the MB_Server, we can open a browser via the button on the right hand side of the text field that pops up. Your data block should closely resemble this:Īfter creating the config Data block, navigate back to the Main program block. We want to add a field for all inputs and outputs except for EN, ENO, and MB_HOLD_REG. Choose a Data block, name it something along the lines of Modbus_Config, ensure it is a Global DB and click OK. In the Project tree under Program blocks, double click Add new block. We will create a Data block to represent these inputs and outputs. STATUS – Status information for the instruction / displays error codes
#Modbus server windows code
If true, error code is displayed in STATUS NDR – New Data Ready: Indicates if data was written by the clientĭR – Data Read: Indicates if data was read by the clientĮRROR – Indicates if an error occurred. MB_HOLD_REG – The Data block representing the Holding Registers of the server IP_PORT – The IP port of the server, default of 502 You should now see an MB_Server block with the following inputs and outputs:ĭISCONNECT – If this input is set to true, it will refuse any attempted connectionĬONNECT_ID – The server’s ID, must be different from any other servers on the network
This should open a menu for the required Data block. At the bottom of the Instructions panel under Communications, expand the Others and Modbus TCP folders and drag MB_SERVER to the desired Network in your Main program block. On the right hand side should be the Instructions panel (if you do not see this, you can expand it by clicking Instructions on the right hand side near the top). In the Project tree on the left hand side, expand your PLC drop down menu, enter Program blocks, and double click your Main block. Once you have finished setting up your device, we can create the Modbus Server.
This should pull up the Device view of your PLC, where you can add any additional signal boards and modules by right clicking their location in the device view, selecting Show catalog, and choosing the device that corresponds to your physical setup. In this case, we’ll select Controllers > SIMATIC S7-1200 > CPU > CPU 1212C AC/DC/Rly > 6ES7 212-1BD30-0XB0 and then click Add. From the Controllers menu, navigate the file browser and find your specific PLC by its name and MLFB (Article no.) as shown below. Open TIA Portal and create a new project, after which you should be directed to the First Steps screen.Ĭlick on Configure a device and then Add new device. This guide will use TIA Portal v15.1 and a Siemens S7-1200 PLC to serve as an example. If you have an existing project associated with the PLC you would like to configure, open it and skip to the Creating the Modbus Server section of this document.
#Modbus server windows software
This guide assumes you already have TIA Portal and software support packages installed.
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