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I want to communicate between Tricon PLC and Siemens S5 PLC using Modbus TCP/IP protocol. The Tricon PLC supports Standard Modbus TCP/Ip protocol which can be configured as a master or a slave. But when approached the siemens vendor, I was told i needed a siemens communication module, sub-interface module and a specific modbus driver. And i was told that they don't have a specific modbus driver for tricon PLC. Kindly suggest on how to communicate between these 2 PLC's.