The state alarm feature
- Last UpdatedDec 17, 2024
- 2 minute read
Select the State alarm Feature to add and configure a State alarm on an attribute of Boolean data type. You can add a State alarm Feature to a template or instance. If added to a template attribute, the State alarm Feature is automatically locked in derived objects. State alarm Features cannot be added to attribute arrays.
You can set an alarm message and Priority for a state alarm. The time deadband is used to filter out rapid, transitory value spikes, and the active alarm state determines the trigger value (True or False) that will activate the alarm. You can also link the State alarm to an external attribute to capture alarm conditions detected in the PLC, rather than in the Application Server object.
For each State alarm, specify the following parameters:
|
State Alarms Feature Parameters |
Description |
|---|---|
|
Category |
The alarm category. Select a category from the list box. See Configure state alarms for additional information. |
|
Priority |
A numeric value for the urgency of the alarm. Valid values are 1 through 999, with 1 being the most urgent. For more information about pre-configuring alarm priorities, see Configure priority ranges for alarm historization, mapping, and shelving . |
|
Alarm message |
Browse and select an existing attribute or type a text string as an alarm message. This text string appears in the InTouch alarm view. |
|
Active alarm state |
The state of the active alarm, True or False, when the alarm is triggered. |
|
Alarm for Attribute |
This lets you link to an external attribute, such as a PV attribute, to provide historical state alarm data from the PLC. This allows the PLC to pass alarm conditions it detects directly to Application Server. You can use the Attribute Browser to select which attribute to link. The Alarm for Attribute parameter is for use only with Historian Clients and is not compatible with InTouch HMI clients. For more information, see Configure an external alarm source for a boolean attribute. |
|
Time deadband |
The time, in seconds, that must elapse after the attribute value exceeds an alarm limit before the alarm is triggered. |
For additional information, see Configure state alarms.