IEC 870-5-101 Application Layer

• Review DNP Application Layer Diagram

• Show ASDU diagram

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Slide 21 of 30

Type ID - Identifies the object format

Qualifier

        Quantity of points

        indexed or sequence of points

Cause of Transmission - optional originator address

        e.g.: cyclic; spontaneous; activation; activation termination

ASDU Address - 8 or 16 bits fixed

Information Object Address - 8, 16, or 24 bits fixed

        Point number - repeated if qualifier is indexed

Data - repeated quantity times