Siemens S7-200 PLC | CPU 226 | Profibus DP EM 277 communication
In a typical DCS architecture, some remote/Distributes IOs are communicating data with plant main control loop via profibus. For this purpose, a profibus DP slave module i.e EM277 (in case of s7-200) is used to send and recieve data to plant main controller.
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