Conclusions

• Combining DNP function code and data format into the Type ID field reduces confusion, but limits message to one data format

• IEC 870-5-101 has a simpler qualifier code

• The above items replace the implementation tables in a DNP Device Profile Document with check boxes

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Slide 28 of 30

Because DNP permits multiple object types per message, it also requires a more complex object header format.

IEC uses a combination of Cause of Transmission and qualifier codes embedded in data objects (Type ID) in a similar manner to DNP's use of application function codes. DNP function code applies to all object types in the message.