Totalization (Analog Integration) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
15.0
Revision date
2022-11-18

The Totalization (Analog Integration) logic block provides totalization to integrate an analog input over time. This block is typically used to record the usage of a consumable (for example, electricity, steam, and chilled water) monitored by the analog input.

The Reliability attribute of the block is reliable except in the following scenarios:
  • Math Overflow—The Present Value, Accumulator, Rollover Amount, or Rollover Count exceed the maximum value that can be expressed by a single floating-point number. At Math Overflow, the Present Value keeps its previous value and stops updating.
  • Round Off Error—The Present Value is implemented as a single floating-point number; it has 7 digits' precision. Round Off Error may occur due to the limitation in precision.
  • Input Unreliable—If the input used in the calculation is unreliable, the block stops totalization.

The following table describes the inputs and outputs of the Totalization (Analog Integration) logic block.

Table 1. Totalization (Analog Integration) Block Inputs and Outputs

Name

Data Type

Exposed for Connection by Default

Description

Default Value

Inputs

Active

Boolean

No

Prevents or allows the updating of Present Value.

True

Input

Float

Yes

Indicates the Input value that the block uses to provide totalization.

0.0

Reference State

Float

No

This attribute is not used for Analog Integration.

 

Reset

Boolean

No

Resets the Present Value, Accumulator, Rollover Count, and Rollover Amount to zero.

False

Scale Factor

Float

No

Provides unit conversion.

1

Outputs

Accumulator

Float

No

Accumulates the remainders in the calculation of the Present Value due to the precision limit of a single floating-point number. The sum of the Present Value and the Accumulator provides a double floating-point expression of the current totalized value for the block.

0.0

Error Since Last Reset

Boolean

No

Indicates any errors that occurred since the time of the last reset. Since the last reset, if the block’s Reliability is any value other than Reliable, this output is set to True. If the Reset input changes from False to True or a Reset command is issued, this output is set to False.

False

Present Value 1

Float

Yes

Indicates the current value of the block. The sum of the Present Value and the Accumulator provides a double floating-point expression of the current totalized value for the block.

0.0

Rollover Amount

Float

No

Increments this value by the current value of Present Value.

0.0

Rollover Count

Float

No

Indicates the value by which the Present Value is incremented.

0.0

Properties

Interval

Float

N/A

Indicates the execution period of this block.

60 Seconds

Rollover Limit

Float

N/A

Sets a value that automatically rolls over the Present Value when the Present Value exceeds the value (that is, the block adds the Present Value to the Rollover Amount, adds 1 to the Rollover Count, and sets the Present Value and Accumulator to 0).

10,000

Rollover Mode

Enum

N/A

Indicates the method to automatically roll over the Present Value (that is, the block adds the Present Value to the Rollover Amount, adds 1 to the Rollover Count, and sets the Present Value and Accumulator to 0). The rollover method is based on value (Rollover Limit) or set to No Rollover. When the Rollover Mode changes, the Rollover Count and Rollover Amount change to zero.

No Rollover

Setup

Enum

N/A

Indicates the type of totalization block.

Analog Integration

1 This input or output is the Default Element of the block.