Hello, if you want to read and write with a ctrlX to a Modbus TCP device ("slave") you have several posibilities: Own PLC program using IEC63111 Modbus TCP lib ctrlX Node-RED app with node node-red-contrib-modbus: https://flows.nodered.org/node/node-red-contrib-modbus ctrlX telegraf app with Modbus plugin https://github.com/influxdata/telegraf/blob/release-1.23/plugins/inputs/modbus/README.md Own written app using ctrlX AUTOMATION SDK: There are a lot of Modbus libs for different progrmimg languages avaiable: C++, Python, go, ...
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