Alarm Violation Criteria

The only way for a channel to cause an ALARM is to set its Alarm Violation Criteria to define what constitutes an Alarm Violation. When these criteria are met continuously for the entire trip delay period (as reflected in the channel's current reading), the channel transitions into an UNACKNOWLEDGED ALARM state. The channel Alarm Violation Criteria selection depends on the channel type, which in turn is dictated by the SNA address.

 

Discrete Channels:

 

Analog Channels:

 

Both discrete and analog channel types can also be set to the following:

 

Discrete Reporting Formats:

 

Analog Reporting Formats:

 

Note: These last two settings are useful for example when reporting maximum and minimum values and the corresponding time of day that they occurred, as stored in PLC register locations.

 

The formatting of the analog value in reports is determined by standard floating-point number practices.