The WinCC OA DNP3 (Distributed Network Protocol 3) driver uses an open, robust and modern protocol, which has similar characteristics and strong points like the IEC Driver. The transmission of any number of telegrams with different data types occurs between the WinCC OA system (master) and the outstation (slave).
The DNP3 driver is supported under Windows and Linux and can be used for:
transmitting telegrams to the outstation
polling telegrams from the outstation and
receiving spontaneous telegrams from the outstation
The user interface of the DNP3 driver is composed of the Configuration Panel for the outstation and Peripheral Address Panel.
Redundancy is supported by the WinCC OA DNP3 driver. It is assumed that the outstation accepts two independent and equivalent connections.
The DNP3 protocol is divided into four layers, which are used for the communication between the WinCC OA DNP3 driver and the outstation. The layers are:
Physical Layer – the physical media over which the protocol is being communicated,
Data Link Layer – transmission of telegrams between sender and receiver
Pseudo Transport Layer – segmentation of APDUs (Application Layer Protocol Data Unit) into TPDUs (Transport Layer Protocol Data Unit).
Application Layer – segmentation of (Application Segment Data Unit) into APDU.
The WinCC OA DNP3 driver supports connections of DNP3 Level 3+ (WinCC OA as master and the outstation as slave). See also chapter Compatibility of the DNP3 Driver (Interoperability).
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