Analog Value Attributes - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 13.1

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
13.1
Revision date
2019-12-04
Language
English

Table 1 describes the Analog Value object attributes. These attributes are displayed in alphabetical order. See Object Attributes in the Input and Output Objects section for descriptions of the data provided in this table.

Table 1. Analog Value Attributes

Name

Type

Mode

Description

Application COV

Input

All Modes

Provides a change-of-value function for the application.

The Application COV is set to a non-zero value for setpoint inputs only (Network Sensor inputs excluded). For all other input types, the value is set to zero.

This attribute is used for inputs that change frequently, causing the application to run, which may increase COV messages on the MS/TP Field Bus.

BACnet Exposed

Network Input

Network Output

All Modes

Use to expose the object to BACnet systems. The BACnet exposed object is a viewable object through the Supervisory Controller.

COV Increment

Input

Output

Network Output

Configuration

Commissioning

Indicates the minimum change in Present Value (appears as O1) that triggers a new COV message.

Range: 0–100

Default Value

Network Input

Network Output

All Modes

Use to specify the Present Value if no source is connected or if the connected source is never reliable.

Description

Input

Output

All Modes

Indicates the description provided for the object.

Destination References

Output

Simulation

Commissioning

Indicates the array of attribute references for the destinations. All references must be from a single object.

Display Precision

All Types

Configuration

Commissioning

Indicates the point at which value attributes are rounded for display (and how many numbers following the decimal point appear). Set Name: Display Precision

Error Status

Network Input

Network Output

Configuration

Commissioning

Status of the last communication that occurred with an input or output reference. Common errors include:
  • Surrogate Object is Not Bound: The referenced device (Device ID) has never responded because a device with the entered Device ID either does not exist or is offline.
  • Remote Device is Offline: The referenced device did respond at one time but is no longer responding.
  • Unknown Object: The referenced device exists and is online, but the Object ID entered does not exist on that device.
  • Type Mismatch: The referenced object exists but the data type of the referenced attribute/property is invalid. This error generally does not appear for inputs on Johnson Controls or third-party devices. For outputs on third-party devices, the Object Type of the output needs to match the type of output object making the peer reference.
  • Unknown Property: This error generally does not appear if you leave the Peer Reference Attribute field as Present Value. If you change this setting, the Unknown Property error means the referenced object exists but the referenced attribute does not exist.

Failsoft

Network Input

Network Output

All Modes

Indicates how the Network Input or Network Output behaves when the connected source, such as a supervisory command or peer reference, is not Reliable. If the source is not Reliable, the element uses either the default value for the current value (if Failsoft is true) or the Last Reliable Value (if Failsoft is false). For a Network Input, the source is considered unreliable whenever the priority array of the Present Value is empty.

In Test

Network Input

Network Output

Simulation

Commissioning

Displays a Boolean value that is True if you manually set the Current Value for test purposes.

This attribute is a calculated value (Output).

Max Value

Input

Output

Configuration

Commissioning

Represents the upper limit for Present Value (appears as O1) when it is used to calculate output. If Present Value is higher than the value specified in this attribute, Present Value assumes the value of Max Value.
Note: This attribute does not affect the value of the Present Value attribute, only the impact Present Value has on Output calculation.

Max Value must be greater than Min Value.

This attribute resets to the default value if you edit the Units attribute.

Units: See Units.

Min Change to Send

Output

All Modes

Indicates the array of floating values (each value corresponding to a single Input) to specify the minimum change in the Input that is sent to the destination. This attribute is only applicable when the Input is of floating-point data type. The change is evaluated by comparing the current value of the Input to the value the last time a message was sent to the destination.

Min Value

Input

Output

Configuration

Commissioning

Represents the lower limit for Present Value (appears as O1) when it is used to calculate output. If Present Value is lower than the value specified in this attribute, Present Value assumes the value of Min Value.
Note: This attribute does not affect the value of the Present Value attribute, only the impact Present Value has on Output calculation.
Min Value must be less than the Max Value.

This attribute resets to the default value if you edit the Units attribute.

Units: See Units.

Name

All Types

All Modes

Object name.

Object Identifier

All Types

All Modes

Indicates the instance number of the Object Type as exposed to the network. The Object Identifier must be unique within the host device. The Object Identifier is created after defining hardware in the Hardware Definition Wizard accessible from the Define Hardware button or Operations menu option.

The Object Identifier consists of the BACnet Class ID and the object’s Instance Number separated by a colon. For example, an Object Identifier of AV.10026 has a BACnet Class ID of AV and an Instance Number of 10026.

Out of Service

Input

Output

Commissioning

Indicates whether the object is currently connected to the hardware or offline (out of service).

This attribute is visible in an SAB device.

This attribute is a calculated value (Output).

Peer Reference

Network Input

Network Output

Configuration

Commissioning

Contains the elements needed to use peer-to-peer communication. These elements are:
  • Instance Number (BACnet ID): Device’s Instance Number. Make sure you verify the device's instance number before setting this value. You can access the device instance number on the Network Settings screen of the Hardware Definition Wizard. You also can locate the instance number of devices using the system UI. If the Johnson Controls Point Schedule was used to transfer to the controllers, check the instance number on the MS/TP Field Device tab of the project's Point Schedule.
  • Object Identifier: BACnet Class ID and the object’s Instance Number.

    The BACnet Class ID should typically have the same Data Type as the object for which the peer-to-peer attribute is being configured. For example, an AV Network Input should reference another AV, an AI, or an AO object. If multistate values are used in peer-to-peer references, the Enumeration sets should match. If the sets do not match, you must determine whether the values in the sets are compatible.

    You can locate the Object Identifier in the Advanced view of the Details dialog box. The Peer to Peer Disabled option allows you to disable peer-to-peer communication.

Present Value (Appears as O1)

All Types

Simulation

Commissioning

Indicates the current value (with the highest priority) being sent to this object.

Present Value is used to calculate the output.
Note: During this calculation, Present Value is restricted between Min Value and Max Value; however, the value represented in the Present Value attribute is not restricted.

Units: See Units.

This attribute is a Default Element and is a calculated value (Output).

Reliability

All Types

Simulation

Commissioning

Provides the following values to indicate whether or not the Present Value (Appears as O1) is reliable:
  • Unreliable Low: Present Value is below Min Value.
  • Unreliable High: Present Value is above Max Value.
  • Reliable: Preset Value is between the Min Value and Max Value.
Set Name: Reliability

This attribute is a calculated value (Output).

Relinquish Default

Input

Output

Configuration

Commissioning

Contains the default value for Present Value (Appears as O1) when all priorities are released.

The Present Value is sent to the value in Relinquish Default only at startup or when the last priority value is released. Present Value does not update if you change Relinquish Default.

Units: See Units.

Restore Command Priority

All Types

All Modes

Restores the commands you select in the case of a power failure. For more information about command priorities, see Command Priority Levels. The following list displays the command priorities you can select.
  • Operator Override
  • Default

Source References

Input

Simulation

Commissioning

Indicates the array of attribute references for the sources. All references must be from a single object.

Status

All Types

Simulation

Commissioning

Reflects the status of the object based on the Reliability attribute and the status of any commands.

Possible values for Analog Value objects are:
  • Offline
  • Out of Service: Out of Service is True.
  • High Priority: Present Value (Appears as O1) is currently controlled at Priorities 1 - 5.
  • Operator Override: Present Value is currently controlled at Priority 8.
  • Unreliable: Reliability is not reliable.
  • Normal: None of the above is correct.
Set Name: Status

This attribute is a calculated value (Output).

Units

All Types

Configuration Mode for All Types

Commissioning Mode for Input and Output Types

Indicates the units of measurement for Present Value (Appears as O1), Min Value, and Max Value.

This attribute resets to the default value if you edit the Setup attribute.

Set Name: Unit

Use COV Min Send Time

Input

Output

Configuration

Commissioning

Configures the object to send COV messages on a periodic basis instead of on every change of value that exceeds the COV Increment. This attribute is typically set to True for objects with values that fluctuate greatly, such as air pressure, to decrease the number of COV messages. The change of value still must exceed the COV Increment to be reported.

Note: If you have more than 100 objects, set this value to False.

The Min Send Time value is set at the supervisory controller on the Device object, and has a default of 15 seconds.

Use Default if Not Reliable

Input

Output

All Modes

For Inputs: Specifies the behavior when the Source is not reliable. If True, the Output is set to its Default Value whenever its Source is not reliable and its Reliability is marked as Reliable. If False, the Output maintains its last reliable value and its Reliability reflects the reason that the source is not reliable.

For Outputs: Specifies the behavior when the Input is not reliable. If True, the destination is sent the Input’s Default Value whenever the Input is not reliable and its Reliability is marked as Reliable. If False, the destination is not updated and keeps its last reliable value.