Analog Row Edit: Alarming tab

Enable Email Notification

Select to enable the record for email alarm notification.

For further information on the items in this section, refer to Email Alarm Notification.

Alternate Email Subject

Select if alarms associated with this point are OASyS SCADA-related alarms.

When selected, the subject line of email messages sent to defined recipients comes from the "emailSubject" application record. If the "emailSubject" application record does not exist, the subject line defaults to SCADA Alarm.

When not selected, the subject line comes from the "emailMeaSubject" application record. If the "emailMeaSubject" application record does not exist, the subject line defaults to Measurement Alarm.

For further information, refer to Email Alarm Notification.

Email Alert Group

Enter or select the name of the alertGroup record containing the Controllers and/or Administrators who will receive messages about alarms associated with this point.

Minimum Alarm Severity

Do one of the following:

• Select a Minimum Alert Severity.

  The application sends an email message when an alarm's severity level is equal to, or greater than, the Minimum Alert Severity. No message is sent when an alarm's severity level is below the Minimum Alert Severity.

• Select none to disable this field.

  Note: The system excludes Return-to-Normal alarms from the minimum alert severity filter.

Return to Normal Alarms, All Off- Normal Alarms, HiHi, Hi, Lo, LoLo, User Hi, User Lo, Instrument Fail, ROC, Creep, Setpoint Creep, Flatline

Select the types of alarms that will generate email messages.

Note: If you select yes for All Off-Normal Alarms:

• All the following off-normal alarm fields become unavailable.

• The system sends out emails for all off-normal alarm conditions, regardless of individual off-normal alarm settings.

Paging Park Time

Enter the amount of time (in minutes) that the Field Operator has to respond to the alarm. After the time expires, the alarm message will become visible to the Controller.

Paging Retry

Enter the number of retry, or reminder, messages that will be sent until the Field Operator acknowledges the alarm or the Paging Park Time expires.

Annunciated Page

Select the Annunciated Page field to allow both the Field Operator and Controller to acknowledge the alarm. If this field is selected, the alarm will not be parked and will be visible to the Controller immediately.

Instrument Fail Check

Select to generate an alarm when an instrument failure occurs.

An alarm is only generated if the analog point is connected with a Remote Terminal Unit (RTU) capable of sensing instrument failures.

Instrument Fail Deadband

Enter the deadband value to apply to the instrument’s lower and upper raw operating limits, as configured in the Minimum (EGU) and Maximum (EGU) fields on the Input tab.

This value controls the sensitivity of the High and Low alarms. For more information, refer to Deadbands.

Alarm Deadband

Enter the deadband value for the analog point.

This value controls the sensitivity of the High and Low alarms. For more information, refer to Deadbands.

HiHi/LowLow

Alarm Check

Select to edit the HighHigh and LowLow alarm limits. Refer to Alarm Limits for more information.

Hi/Low Alarm

Check

Select to edit the High and Low alarm limits. Refer to Alarm Limits for more information.

HiHi Alarm Limit

Enter the HighHigh alarm limitfor the analog point.

Hi Alarm Limit

Enter the High alarm limit for the analog point.

Lo Alarm Limit

Enter the Low alarm limit for the analog point.

LoLo Alarm Limit

Enter the LowLow alarm limit for the analog point.

Enable ROC Alarm

Select to enable the Rate of Change (ROC) alarm. If the ROC exceeds the ROC limit, an alarm is generated.

Refer to Rate of Change Checks for more information.

ROC Type

Select the type of ROC alarming to use. Options:

• baseline method. Use the baseline method of ROC alarming.

• custom method. Use the baseline method of ROC alarming with the additional fields below:

  • Negative Rate of change limit

  • Time Interval for ROC

    In the baseline method, the system calculates the ROC as the difference between the current and previous poll, divided by the difference in time between these consecutive polls. This yields a rate in engineering units (EGUs) per second, which the system then compares against the ROC limit. The system generates an alarm if either positive or negative ROC occurs.

    The custom method works to reduce nuisance alarms by allowing you to specify the delta time between values, as opposed to the system calculating the ROC between consecutive polls. In addition, the custom method allows for different ROC limits for positive and negative ROC.

    The system calculates custom ROC by recording multiple poll cycles (up to 30) and calculating the ROC between values that are separated in time by at least the delta time value that you specify. (Time Interval for ROC):

    ROC = (Current Value - Value at Delta Time ago) / Delta Time

    Where:

• Delta Time = Time Interval for ROC.

  It is best to set the Delta Time to a multiple of the poll cycle time. For example, if poll cycles are 10 seconds, set the Delta Time to a value divisible by 10.

  Note: Baseline alarms are not persistent. However, Custom ROC alarms are persistent. Subsequent to a Custom ROC alarm, the system continues to calculate the ROC each poll using the above method, and maintains the alarm state so long as the ROC over the Delta Time exceeds limits. For custom ROC alarms, once the limit is no longer exceeded, a return-to-normal alarm will be generated.

Rate of change limit (Units/Sec)

Enter the maximum allowable ROC (EGUs per second).

Negative Rate of change limit (Units/Sec)

Enter the maximum, negative allowable ROC (EGUs per second).

Time Interval for ROC (sec)

Enter the time interval over which the system should calculate the rate of change.

Creep Detection

Select to enable the Creep Detection alarm. If the analog value creeps out of its calibrated state by a value that exceeds the Deviation Alarm Limit, an alarm is generated.

Refer to Creep Detection for more information.

Deviation Alarm Limit

Enter the maximum deviation value (EGUs) that is acceptable before calibration deteriorates.

Setpoint Creep Detection

Select to edit the Setpoint Deviation Alarm Limit field.

For further information on the items in this section, refer to Setpoint Creep Alarms.

Setpoint Deviation Alarm Limit

Enter the setpoint creep limit.

Flatline Alarming

Select to enable Flatline Alarming. If the analog value does not change within the Timeout value (min), an alarm is generated.

Timeout value (min)

Enter the maximum about of time (minutes) that can pass without the analog value changing.

Enable Realarm (0-255 mins)

Enter the number of minutes after which an acknowledged alarm should re-alarm.

Note: An entry of 0 disables the Re-Alarming functionality.

For further information, refer to Re-Alarming.

Alarming on-delay

In this section, set the on-delay time in seconds for the desired alarm levels. When an alarm condition occurs, OASyS SCADA waits this many seconds before generating an alarm.

For further information, refer to On/Off Delay enhancement.

Alarming Off-delay

In this section, set the off-delay time in seconds for the desired alarm levels. When a return to normal condition occurs, OASyS SCADA waits this many seconds before generating a return to normal alarm.

For further information, refer to On/Off Delay enhancement.

Maximum period of time (min)

Enter the maximum allowable park time for alarms associated with this point.

For further information, refer to Alarm Parking.

Enable Alternate Alarm Limit

Select to enable alternative alarm limits and edit the Alarm Limit Set field.

For further information on the items in this section, refer to Alternate Alarm Limits.

Alarm Limit Set

Select (...) and select the desired alarmlimitset record from the Alarmlimitset Select dialog box.

Enable Critical Alarming

Select to enable critical alarming on the analog point.

When the point enters an alarm state configured as critical, the application sends a Critical Alarm Active notification to the easy eXtended Operator Station (ezXOS).

For further information, refer to Critical Alarms.

Alarm Suppression

Select to open the Alarm Suppression (Almsuppression) Table Edit dialog box, and configure almsuppression records associated with this record.

Safety Related Point

Selecting to flag the point as safety related allows you to easily filter the point in the RealTime database (RTDB) for reports and identify when a system change affects the point.

For further information, refer to Safety points.

Safety Related States

Select to open the Alarm State Setting dialog box.

For further information, refer to Safety points.