![]() ![]() 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. Terminologyįirst, a clarification on the terminology I’m using. If you are trying to make data available from your PLC to a Modbus TCP Client, then take a look at this blog, or to a Modbus RTU Client, this one. By Christina Keefe on Do you need to access data from a Modbus TCP Server on your S7-1500 PLC? If so, then do not fret, I will walk through setting up your PLC as a Modbus TCP Client to do just that. Many thanks to DMC who published this fantastic blog post on using a Siemens S7-1500 PLC as a Modbus TCP Client.
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