Limit Alarm Properties
- Updated2023-02-21
- 1 minute(s) read
The limit alarm specifies limits that can generate an alarm when a value equals or exceeds the limit. There are four alarm limits: high high limit, high limit, low limit, and low low limit. Wire the OPC UA limit alarm refnum out output of the Exclusive Limit Alarm and Nonexclusive Limit Alarm instances of Add Condition VI to the reference input of a standard Property Node to get the Limit Alarm Property Node. This Property Node has the following properties:
| Property | Description |
|---|---|
| Active State | Whether a condition is in the active state. Details |
| Enabled State | Whether a condition is in the enabled state. Details |
| Input Node Id | The ID of an input node. Details |
| Limit | The values of the high high limit, high limit, low limit, and low low limit. Details |
| Max Time Shelved | The maximum time that an alarm condition is in shelved state. Details |
| Retain | Whether an OPC UA client synchronizes the condition state with that of the server. Details |
| Severity Level | The values of the high high severity, high severity, low severity, and low low severity. Details |
| Shelving State | Whether an alarm condition is in shelved state. In shelved state, an alarm cannot display to the end user. Details |
| Shelving Timer Resolution in mSecs | The smallest time unit, in milliseconds, for the timer to calculate shelving time. Details |
| Suppressed or Shelved | Whether an alarm condition is in suppressed or shelved state. Details |
| Suppressed State | Whether an alarm condition is in suppressed state. In suppressed state, an alarm does not occur at all circumstances. Details |