Lastly, the RemoteAddress should be set to the IP address of the server you are trying to communicate with. The InterfaceID can be found by going to Device Configuration in the project tree, then clicking on the Profinet interface which you are using, selecting properties in the inspector window at the bottom of the application, and then navigating to the System constants tab. It is also possible to use a memory area and reference it using the ANY format, 'P bit address' 'data type' 'length'. In my experience, I've had the best luck using a global data block with an array of booleans or words. A common start value for Modbus holding registers is often 40, but it will vary based on your data setup and server. Generally, a value of 0 is used for reading data from the server, and a value of 1 or 2 is used for sending writing data to the server.

This input needs to be false in order to communicate with the server. If this block changes to false in the middle of a communication request, the block will finish that request, but it will not send a new request until REQ becomes true again. When this input is true, the block will continuously send requests to the server with the parameters indicated by the other inputs.

REQ: This is a boolean input that controls when Modbus communication requests are being sent to the server. It is located under the Communication category in the Instructions window, as shown below. In this case, since we are trying to access data from a Server, our PLC will be acting as the Client. I find it hard to keep track of these terms, so it's always helpful to have them defined. The Master, or Client, is responsible for sending commands, such as reading or writing data. Master and Client can be used interchangeably here, as can Slave and Server. The roles played by the two devices exchanging data can be classified as Master-Slave or Client-Server. Hi suvarn, im not recognized with this programms sorry can help, and do you use to convertor, siemens uses RS for its modbus serial ports, make a standart RS cable and try again and error codes you can see in help.First, a clarification on the terminology I'm using. Hi suvarn, Thats ritght that modscan32 act as master, but there is version that act as slave those programs are not free but try to find a free version.īest Regards, Greg. Google and write down modscan and find a proper download link. This contribution was helpful to 1 thankful Users SolutionFinder. Hope it will help you, Best Regards, Greg. Hi suvarn, i didnt really understood the problem, but if i got you correct you want to check if the modbus communication established. I downloaded that program to the plc but i dont know how to check whether the communication is happend or not. Rate 0.įrom forum i got the sample program for send and receive data to and from pc. Android application preferences tutorialĪttachment modbus.

Product Support Services Forum mySupport.

S7 200 Modbus Slave Library Download