Profibus PA (process automation) is used for communication between measuring and process instruments, actuators and process control system or PLC/DCS in process engineering. Profibus PA is a Profibus version with physical layer suitable for process automation, in which several segments (PA segments) with field instruments can be connected to Profibus DP via so-called couplers. The two-wire bus cable of these segments takes over not only the communication, but also the power supply of the participants (MBP transmission technology). Another special feature of Profibus PA is the widely used device profile "PA Devices" (PA Profile),