Alarms

Alarms are the objects that indicate the occurrence (start) or end of a relevant (alarm) system event. The conditions for starting or finishing an alarm are defined by the system configurator. The conditions might be the status of other objects, but also a composite expression containing states and values of other objects. Alarm occurrence is indicated on the screen in the process D2000 HI. Changes in alarm states might be logged, i.e. written into the log database.

Note
This chapter is related to system alarms. Besides these, the D2000 system also recognizes the so-called process alarms that allow handling extraordinary states in the system. Process alarms are defined for objects of I/O tag, Eval tag and Switch types. The configuration of such an alarm is included in the configuration of the corresponding object. More information on process alarms can be found in the topics describing the configuration of I/O tags, eval tags and switches.