Learning outcomes
- Explain the key principles of opc, apis and system integration.
- Carry out a structured practical check or configuration task.
- Recognise common faults, risks and evidence needed for diagnosis.
Module 13 · Lesson 4
OPC, APIs and system integration
Understand OPC DA/UA, middleware, APIs, databases and safe integration boundaries.
Before you begin
Integration architecture and test environment.
Safety: Use site procedures, approved test equipment and competent supervision. Never bypass a protection or interlock without formal control.
Step-by-step learning
- Identify publisher, consumer, protocol, namespace and security model.
- Use read-only access unless control is genuinely required.
- Test quality, timestamps, reconnect and duplicate handling.
- Rate-limit and monitor interfaces so integration cannot overload control systems.
Ian's practical tips:
- Prefer supported interfaces over direct writes to proprietary databases.
- Integration failures need visible health and retry status.
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.