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data and dc supply networks

In industrial automation (IA) and process control, many analog and digital modules of programmable logic controllers (PLCs), distributed control systems (DCS), motor and valve drives, and sensor/actuator interfaces operate from a standardized, nominal 24 VDC supply. This supply is commonly distributed as a DC bus throughout the entire system. Data exchange between these modules is carried out via industrial network protocols such as Profibus, Modbus and Interbus—all of which utilize RS-485 as their physical layer. For both economic and convenience reasons, the 24 V bus and RS-485 bus are distributed through the same conduits. This means there is risk of short circuits between supply and data conductors in the case of insulation faults.

PTM Published on: 2017-02-08