Learning outcomes
- Explain the key principles of dnp3 concepts and object model.
- Carry out a structured practical check or configuration task.
- Recognise common faults, risks and evidence needed for diagnosis.
Module 11 · Lesson 1
DNP3 concepts and object model
Understand outstations, masters, classes, events, static data, quality flags and time-stamped reporting.
Before you begin
DNP3 simulator or telemetry devices and point list.
Safety: Use site procedures, approved test equipment and competent supervision. Never bypass a protection or interlock without formal control.
Step-by-step learning
- Identify master/outstation addresses and transport method.
- Map binary, analogue, counter and control objects.
- Configure integrity polls and event classes.
- Verify quality flags and source timestamps are preserved.
Ian's practical tips:
- DNP3 is strongest when events and quality are used—not when treated like simple register polling.
- Point indexes must remain controlled across outstation, master and SCADA database.
Fault-finding questions
- What should be happening, and what evidence proves it?
- Where is the last known correct signal, voltage, state or process condition?
- What changed immediately before the fault?
- Can the system be divided into smaller testable sections?
Practical activity
Create a one-page test record for this lesson. Include expected values, measured results, equipment used, risks controlled, defects found and the final proven condition.