Modbus is a widely used Industrial Communication Protocol. A handful of industrial equipment relies on this Protocol because of its practical data exchange structure and coverability of field scenarios. Even though setting up communication between devices with the protocol is not often a complex task, industrial communication needs to ensure data and communication channel availability.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/configuring-a-high-availability-s7-1200-modbus-cyclic-data-exchange