Conclusions

• IEC 870-5-101 and DNP provide similar application functionality in similar ways

• To perform some functions, IEC 870-5-101 sends many small messages where DNP will send a smaller number of larger messages

• The larger number of low-level configuration options in IEC 870-5-101 tends to require greater knowledge on the part of a system integrator to successfully commission devices

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Slide 29 of 30

More options in IEC typically means either more configuration options and support program code or else unsupported options so some IEC 870-5-101 devices do not communicate with other devices.

But: familiarity with one protocol makes the other look more complex, no matter which protocol is more familiar! Each has features that are elegant and simple, and features that are complex.