Events and Alarms
Definitions
An event is digital data changing state or any incident detected by the IO module. Events are time stamped and logged in the IO module event history.
Event codes are displayed on the FDM121 display and are used to identify the type of event or alarm.
The IO module event history contains the last 100 time-stamped events.
It can be accessed from:
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FDM121 display.
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FDM128 display using the Ethernet communication network.
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Remote controller using the communication network.
The event can be:
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System events, generated by the IO module.
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IO module events, generated by the digital inputs and outputs.
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Functional events, generated by the application or functions performed by the IO module.
An alarm is a type of event that requires a specific attention.
Alarm Reset Mode
Each alarm is latched and must be reset.
There are three reset modes:
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Auto reset mode: Alarm is reset automatically when the alarm condition disappears.
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Manual reset mode: Alarm is reset using the test/reset button for 0.25–1 second on the IO module.
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Remote reset mode: Alarm is reset by a remote controller using the communication network with the reset IO alarms command.
For more information, refer to the Modbus Communication Guides in Related Documents.
Alarm Priority Level
Each alarm is given a priority level:
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High priority
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Medium priority
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Low priority
Alarm priority level is predefined.
Alarm indication on the FDM121 display or FDM128 display depends on the alarm priority level.
For more information, refer to the following user guides in Related Documents:
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FDM121 Front Display Module for One Circuit Breaker User Guide
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FDM128 Ethernet Display for Eight Devices User Guide