As defined by OPC 10000-5, all events shall have a severity assigned to them. This specification specifies specific severity ranges for some events. If no specific severity or severity range is provided for a defined event or condition, the manufacturer or integrator may choose from the default OPC UA range. The chosen severity when assigning it to a condition or event shall match the following categorization.

Table 10 – Severity Categorization

Severity

Lower limit

Upper limit

HIGH

801

1000

MEDIUM HIGH

601

800

MEDIUM

401

600

MEDIUM LOW

201

400

LOW

1

200

Figure 13 shows examples on how alarms and conditions shall be used in a Compressed Air System.

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Figure 13 – Alarms and Conditions