For anyone who has spent much time working with the SIMATIC S7-400H, it becomes quickly apparent that the devil is often in the details. You find that there are many small settings and 'tricks' that you uncover while setting up redundancy, redundant Modbus communication, redundant communication interfaces for I/O, configuring hardware, etc., that you need to get things running. Sometimes those small details are hard to catch. In the words of my wise colleague Lillian Walker, "The re...
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