The establishment of communication over different CPUs is often convenient in industrial fields. However, many machines and processes must exchange operations, interlocks, and monitoring data from one controller to another. This necessity comes from determining logic decisions based on sensors, actuators, and logic states located in different process sectors and areas.
This is a companion discussion topic for the original entry at https://www.solisplc.com/tutorials/configuring-as-s7-1200-plc-as-dp-slave-in-a-fault-tolerant-s7-400h-system