The Analog totalization extension tracks and records the usage of any consumable monitored through an analog attribute. Some examples of consumables include electricity, gas, steam, and chilled water.
These three essential parameters determine the Analog totalization extension’s mode of operation:
- the Input Reference to be monitored
- the Timebase on which the computation is based
- the Low CutOff Value that the input must meet or exceed
Use the Analog totalization extension to determine the usage of the given consumable. For example, you can determine the amount of gas or steam used by the facility for a given month. Also, use Analog totalization to determine how many kilowatt/hours were used in a week or to totalize a calculated value (for example, degree days).
The Analog totalization extension contains attributes common to Metasys system objects. The following table lists the attributes specific to the Analog totalization extension.
|
Attribute name |
Notes |
Initial value |
Values/Options/Range |
Description |
|---|---|---|---|---|
|
Display Precision |
C,W |
10ths |
Uses Display Precision (Set 0) |
Indicates the rounded position and the number of decimal places to display for this extension. |
|
Executing |
Active |
Active Totalize Limit Inactive |
Reflects the status of this extension. Active: The extension is calculating and has not reached the Totalize Limit. Totalize Limit: The extension has reached the limit and has stopped calculating because Rollover is set to False. Inactive: The extension is unreliable or disabled and is not calculating. |
|
|
Input Reference |
C |
Specifies the object and attribute monitored by this extension. If this attribute is unreliable or falls below the Low CutOff Value, totalization is temporarily suspended. |
||
|
Low CutOff Value |
C,W |
Specifies the object and attribute monitored by this extension. If this attribute is unreliable or falls below the Low CutOff Value, totalization is temporarily suspended. |
||
|
Present Value |
C,D,R,W |
Represents the current value of the extension. |
||
|
Reliability |
Reliable |
Uses Reliability (Set 503) |
Represents the reliability of the Present Value. If the Input Reference becomes unreliable, the totalization extension monitoring the input becomes unreliable. |
|
|
Reset |
W |
False |
False True |
Forces the extension into a reset condition. (Terminates any ongoing calculations, restores the Present Value to initial state, and, for each triggerable attribute, forces a COV report.) This attribute does not appear in a view, but may be scheduled, trended, and so on. |
|
Reset Date |
Represents the date of the last Reset condition of the extension. |
|||
|
Reset Time |
Represents the time of the last Reset condition of the extension. |
|||
|
Rollover |
C,W |
False |
False True |
Defines the special action that the totalization extension must take when the Present Value reaches the Totalize Limit value. If the Rollover attribute is set to False, the Analog totalization extension ceases further operation when the Present Value equals or exceeds the Totalize Limit value. If it is True, it resets the present Value to 0.0 and resumes a new cycle of totalization. |
|
Rollover Count |
0 |
0–4,294,967,295 |
When the Rollover attribute is True, this value increases each time Present Value reaches a value equal to or greater than the Totalize Limit value. |
|
|
Scale Factor |
C,W |
1.0 |
Minimum Value > 0 |
Indicates the value used to scale the totalized value to either a larger or smaller value than otherwise results. |
|
Timebase |
C,W |
Hours |
Seconds Minutes Hours |
Establishes the time frame on which the calculated totalization value is based. |
|
Totalize Limit |
C,N,W |
Limit > 0 |
Defines a threshold value that the Present Value must meet or exceed for the totalization extension to take special action. When the Rollover attribute is set to False, the totalization process ceases further operation. When it is set to True, Present Value is cleared to 0, and the totalization process starts over. |
|
|
Units |
C,W |
IP SI |
Indicates the measurement units of this extension. |
|
|
Value Before Reset |
Indicates the value of the Present Value at the time of the last reset operation. |