Secure data transmission over field bus for process automation technology involves encoding data in field device and transferring key over field bus to field device

摘要

The secure data transmission method involves encoding the data in a field device (F1). The field bus (FB1) is connected via a gateway (G1) to the public communications network (KN). The field bus is configured in accordance with the Profibus, Foundation Field Bus or HART standard. The key is transferred over the field bus to the field device.