Analog Point Properties

Use the Analog page to configure analog properties for a particular point. The Analog page is shown when the point type is set to Analog Input or Analog Output on the General page.

Click the thumbnail to see
a sample Analog page
for an Existing Point

Analog Properties

These are the properties shown on the Analog page in the PNT Editor. See also the ALARMSET security event for more information.

See Token Categories - Point: Alarm for the corresponding tokens for each property and Filter Attributes - Point: Alarm for the corresponding filter attributes for each property.

Property

Description

Default Value

Point scheme

Read-only. This value is set on the General page.

Point data type

Read-only. This value is set on the General page.

Alarm category for point

Select the alarm category for the point. Click … to select a table entry. The entry comes from the PNTALCAT table.

Blank

Suppress alarms

Enables or disables suppression of alarms for the point and the suppression ending condition(s). Click … to configure Alarm Suppression.

See also the ALMSUPP security event for more information.

0 (No)

Value range: Minimum

For Analog Output points, specifies the minimum allowable setpoint for the point.

For Analog Input points, specifies the low range for point values.

Note: If you use this property, any value returned by the point’s Current Value Service that is less than this value will be set to the minimum and the Status of the point will be set to Unreliable.

Value range: Maximum

For Analog Output points, specifies the maximum allowable setpoint for the point.

For Analog Input points, specifies the high range for point values.

Note: If you use this property, any value returned by the point’s Current Value Service that is greater than this value will be set to the maximum and the Status of the point will be set to Unreliable.

Alarm deadband

Specifies the amount the value must exceed the alarm setpoint by to reset (clear) the alarm. See Alarm Deadband for more information.

Unit conversion…

Click to convert units from any unit in the same unit family. See Alarm Limit Unit Conversion below.

Alarm Properties

Enable CVS Calculation

High Alarm Enabled

High Warning Enabled

Low Warning Enabled

Low Alarm Enabled

Out-of-Range Enabled

High Deviation Enabled

Enables the alarm bit. Options are 0 (No) or 1 (Yes). The alarm bit can be enabled without the Report Alarms flag set.

In the CygNet Standard Point Scheme, the alarms correspond to the following bits and alarm calculation types:

High Alarm	Configurable Bit 05	Maximum Value
High Warning	Configurable Bit 04	Maximum Value
Low Warning	Configurable Bit 03	Minimum Value
Low Alarm	Configurable Bit 02	Minimum Value
Out-of-Range	Configurable Bit 01	Value Range
High Deviation	Configurable Bit 06	Deviation Value

See also the CFGBITxx security event for more information.

0 (No)

Calc. Value 1

High Alarm Calc Val 1

High Warning Calc Val 1

Low Warning Calc Val 1

Low Alarm Calc Val 1

Out-of-Range Calc Val 1

High Deviation Calc Val 1

Specifies the value of "Val 1" for the alarm calculation. For all alarms except Out-of-Range, this is the alarm setpoint. For Out-of-Range, this specifies the High Out-of-Range value.

Value can be any rational number; however, value field is limited to 16 characters.

Blank

Calc. Value 2

High Alarm Calc Val 2

High Warning Calc Val 2

Low Warning Calc Val 2

Low Alarm Calc Val 2

Out-of-Range Calc Val 2

High Deviation Calc Val 2

Specifies the value of "Val 2" for the alarm calculation. This is applicable only to the Out-of-Range alarm. It specifies the Low Out-of-Range value.

Value can be any rational number; however, value field is limited to 16 characters.

Note: To successfully display a point in a "Low Out-of-Range" alarm, you will need to first configure the point to have either a low warning or low alarm setpoint. This tells the service that the point is currently in the "Low Out-of-Range" state.

Blank

Alarm Priority

High Alarm Priority

High Warning Priority

Low Warning Priority

Low Alarm Priority

Out-of-Range Priority

High Deviation Priority

Specify the priority of the point’s alarms. Option is 0 to 99, with 99 being the highest.

In the CygNet Standard Point Scheme (0), alarm priorities are categorized as follows:

0 — 24 Low
25 — 49 Medium
50 — 74 High
75 — 99 Critical

0 (No)

Report To CAS

Select to reporting point alarms to the Common Alarm Service (CAS). Options are 0 (No) or 1 (Yes). The individual alarm bits must be enabled.

0 (No)

Report To GNS

Select to report point alarms to the General Notification Service (GNS), which will send notifications when an alarm bit is set/reset. Options are 0 (No) or 1 (Yes). The individual alarm bits must be enabled.

0 (No)

GNS ID

Select the ID of the GNS record to use for the notification regarding the alarm. The record type must be "Event" or "Unspecified." Click … to select a GNS ID. See Configuring a GNS Record for information about setting up GNS IDs.

Blank

Delay Reporting

Select to delay reporting of the alarm to the CAS or to the GNS for some period of time to see if the point goes out of alarm. Options are 0 (No) or 1 (Yes). The individual alarm bits must be enabled.

0 (No)

Delay Value

Specify the amount of time to delay reporting alarms or processing notifications. The countdown begins when the alarm bit gets set. When set, that delay time governs all delay times for the point. Click … to enter the reporting delay value.

The format is as follows:

hh:mm:ss (for values up to 18 hours: 0-17 hours, 0-59 minutes, 0-59 seconds)
DD:hh:mm (for values up to 40 days: 0-39 days, 0-23 hours, 0-59 minutes)
Y:DDD:hh (for values up to 7 years: 0-6 years, 0-364 days, 0-23 hours)

00:00:00

(hh:mm:ss)

Alarm Limit Unit Conversion

A built-in unit conversion utility is available to easily convert primary to secondary unit values for a point. The Alarm Limit Conversion dialog box can be invoked for any Analog Point.

Alarm Limit Conversion

Different measurement units can be selected from any unit of the same unit family, and you can change the value field for the primary or secondary value.

Example

If the primary units are "inch" and the secondary units are "cm", and the value of 5.5 is entered into the Primary Value field this will result in a value of 13.97 in the Alternate Value field. This conversion will also work in the reverse. If 13.97 is entered into the Alternate Value field then a value of 5.5 will appear in the Primary Value field. Unit value conversion only works for Analog points.

Options	Description
Primary value	Displays the value for the point as converted by its units.
Units (for Primary value)	Units that the primary value is displayed as.
Alternate value	Displays the value of the point as converted by its units.
Units (for Alternate value)	Units that the Alternate value is displayed as.

Enhanced Alarm Configuration

Enhanced Alarm Configuration (EAC) expands the CygNet alarm rules to allow a user to extend the conditions by which a configurable status bit is allowed to be set or prevented from being set. When a configurable bit is prevented from being set, any subsequent alarms or notifications that would have been generated are prevented as well. EAC conditions are defined as a series of logical expressions that reference real-time values of the same point or multiple other points. However, all points referenced must reside in the same Common Value Service (CVS) as the point being configured. EAC conditions may contain up to 50 individual expressions, each of which could reference a separate point. The enhanced alarm configuration is available from the PNT Editor's Alarm Settings (Analog, Digital, Enumeration, String) pages.

Click Enhanced alarm settings button (Enhanced alarm settings) to open the Enhanced Alarm Settings dialog box for creating and editing EAC conditions. See Enhanced Alarm Configuration for more information.