Siemens S7 1200 Modbus TCP/IP Communication with Arduino

hello welcome to my third tutorial today I would like to show you how to set up Modbus tcp/ip communication between siemens s7 1200 and arduino i am using an arduino you know controller with an external ethernet card you can also use moduli esp8266 which have integrated Wi-Fi antenna and can be also programmed with arduino ide for the plc programming you just need TI a portal no special license or hardware is needed all functions are already included in the standard license if you would like to use Modbus over rs-485 there is a neat little module which you can plug in front socket of the PLC and it's also inexpensive too it's a good idea to know a little bit about Modbus protocol I will explain the basics but for more in-depth information check the web Modbus is a master slave protocol master is also called client and the slave is called server which is a little bit confusing slave is listening on given port master is responsible for initiation of the connection for storing of the data Modbus uses registers for values they're called holding registers for binaries they're called input registers Modbus message consists of the address of the opposite device function data and CRC check there are four functions each one is defined by number three is read holding register four is read input register five is write single coil and sixes write single holding register in the Tia portal they are numbered slightly differently see the help file alright let's start first we create a new project and Tia portal and add s7 1200 PLC you let's change the IP address be aware that the Arduino controller have to have an IP address from the same subnet I will activate clock memory bits they are good for timings you you can find Modbus functions and the right panel under instructions open communication tab as the PLC will be master in other terminology client we will insert MB client function you I will create DB for controlling of function and also for connection definition if you are unsure about anything open the help file it's well described in there you connection definition have data type of cannae pv4 you interface it is shown in hardware raishin you ideas identification of the connection if you use more than one Modbus function you have to have a unique head for every function connection type is 11 which means TCP active means master IP address is the address of Arduino in this case modbus usual uses port 502 you I will assign control tags to the function you it will start from address zero ten registers you I will check Modbus config DB what is slave ID this is mainly used for Modbus RTU but some devices requires this ID to be 0 or 255 I also created DB for sending and receiving data it contains arrays of integers that should be all now just download the program you phors request bit to one in check incoming data I define three holding registers in Arduino and as you can see data are being received correctly dot you for sending function I will also use the Modbus client function but parameters will be the same you I check the Modbus unit ID again for our do you know it should be one I will create controlling tags you interface ID can be found in hardware configuration you connection ID have to be unique for each function plc is master IP address of arduino and usual port 504 you let's link the controlling tags to Modbus function you for sending Siemens uses number 116 you can find it in the help file transfer will start from address five you let's download the changes and set some values to sending registers you in arduino I declared new registers 5 comma 6 comma 7 and I'm printing the values of our serial line you as I change the value in PLC values also changes in arduino sometimes you have to restart PLC to make the function work some devices require disconnection after every transfer other not refer to your device manual also be careful when editing DB's if you're online with DB there are two values one is starting value which is loaded when PLC starts and other one monitored value which is in the PLC right now always change both also check the firewall if it's not blocking the Modbus traffic that's all folks links for software and project in below the video thank for watching

Channel: Industrial Automation

Views: 55,289

Keywords: Siemens S7, TIA Portal, TIA V15, Arduino, Modbus TCP/IP, Automation, PLC Programminig

Id: c2T2lAMDWGs

Length: 16min 44sec (1004 seconds)

Published: Wed Feb 12 2020