Deep Dive: Integrating OPC UA Alarms & Conditions (A&C) into Modern SCADA Systems
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title: OPC UA A&C Architecture
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flowchart LR
classDef plc fill:#3b82f6,stroke:#2563eb,color:#ffffff
classDef scada fill:#10b981,stroke:#059669,color:#ffffff
classDef alarm fill:#ef4444,stroke:#b91c1c,color:#ffffff
A["PLC (OPC UA Server)"]:::plc -->|A&C Event Stream| B["SCADA (OPC UA Client)"]:::scada
A -->|State Change| A
B -->|Acknowledge| A
C["Alarm DB"]:::alarm -.-> B
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Deep Dive: Integrating OPC UA Alarms & Conditions (A&C) into Modern SCADA Systems
For decades, SCADA systems managed alarms by continuously polling PLC memory registers (e.g., a boolean tag named Pump_Fault). When the SCADA detected a transition from 0 to 1, it generated an alarm, timestamped it locally, and displayed it to the operator. This legacy approach is fundamentally flawed: it consumes excessive bandwidth, risks missing fleeting alarms […]
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