Position Adjust Output 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 Position Adjust Output 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. Unless otherwise stated, the attributes listed in this table appear in the Details dialog box (for example, the Present Value appears in the Control View below the module name in Simulation and Commissioning modes).

Table 1. Position Adjust Output Attributes

Name

Type

Mode

Description

COV Increment

Output

Configuration

Commissioning

Indicates the minimum change in output that triggers a new COV message.

Description

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.

Device Type

Output

Configuration

Commissioning

Describes the physical network device to which the object is connected.

Display Precision

Output

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

Effective Stroke Time

Output

Configuration

Commissioning

Effective stroke time for the actuator to travel the full range on its installed state. This value should take into account the actual range of the device to which the actuator is attached.

For example, an actuator with a stroke time of 120 seconds for 90 degrees of rotation would have an Effective Stroke Time of 60 seconds when installed on a damper that allows 45 degrees of travel.

Accurate configuration of Effective Stroke Time is essential for VAV Box Controller box flow control applications and is used to estimate the position of the actuator. If you change the value of the Effective Stroke Time during execution, the new value is used immediately but the Output is likely inaccurate until the object synchronizes at an end stop.

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 Pulse Width

Output

Configuration

Commissioning

Minimum allowable pulse sent to the motor actuator. This value is specific to the actuator and is determined by the actuator manufacturer.

This value should not be negative.

Name

Output

All Modes

Indicates the name of the object.

Object Identifier

Output

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.

Offline

Output

Commissioning

Indicates if the object is currently communicating with the network device.

This attribute is visible in an SAB device.

Out of Service

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.

Polarity

Output

Configuration

Commissioning

Reverses the direction of Slot A and Slot B.

Set Name: Polarity

Present Value (Appears as I1)

Output

Simulation

Commissioning

Indicates the desired position of the actuator (as a percent of possible rotation). A time-proportional command is issued to increase or decrease the actuator to satisfy the required position.

Present Value is used to calculate the output.

This attribute is the default attribute for the Analog Input object.

Default Value: See Relinquish Default.

Range: 0 - 100

This attribute is the Default Element.

Priority

Output

All Modes

Sends the output at the BACnet priority indicated by the value of the priority input.

Reliability

Output

Simulation

Commissioning

Provides the following values to indicate whether or not the Present Value (Appears as I1) is reliable:
  • Connection Fail: The object fails to connect to the hardware.
  • Math Error: An error occurs in the calculation of the output or the time proportional command.
  • Reliable: The object is none in Connection Fail.

If an Out of Service command is received, this attribute is Reliable. Only when the object is out of service can you write values to this attribute.

Set Name: Reliability

This attribute is a calculated value (Output).

Relinquish Default

Output

Configuration

Commissioning

Contains the default value for Present Value (Appears as I1) 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. If this value is set to 0% or 100%, the object starts resynchronizing on startup or reset.

Restore Command Priority

Output

Configuration

Commissioning

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

Resync Amount

Output

Configuration

Commissioning

Indicates the percentage of the Effective Stroke Time of overdrive allowed per resynchronization.

This value should not be negative, but can be over 100.

Resync Period

Output

Configuration

Commissioning

Indicate the length of time over which Resync Amount is the maximum resynchronize amount allowed.

When the output approaches an end stop (the overdrive region), it applies overdrive to resynchronize the Output with the actual actuator position. Two options for overdrive are:
  • Apply an overdrive once each time the actuator enters the overdrive region. Only after the actuator leaves the region and re-enters may the overdrive be applied again. Use this option for electrical actuators. Set Resync Period to 0 for this option.
  • Apply an initial overdrive when the actuator enters the overdrive region and apply additional overdrives as long as the actuator remains in the overdrive region. Use this option for actuators that drift from their last position while not being commanded (for example, pneumatic spring return actuators). As long as the actuator remains in the overdrive region, the periodic overdrives will be applied on the Resync Period. Set the Resync Period to a non-zero number for this option.

This value should not be negative.

Status

Output

Simulation

Commissioning

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

Possible values for Binary Output objects are:
  • Out of Service: Out of Service is True.
  • High Priority: Present Value (Appears as I1) is currently controlled at Priorities 1 - 5.
  • Operator Override: Present Value is currently controlled at Priority 8.
  • Unreliable: Reliability is not reliable.
  • Output Clipped: Present Value is outside the limits of Min Value and Max Value. Status remains Output Clipped until the output changes.
  • Normal: None of the above is correct.

Set Name: Status

This attribute is a Calculated Value (Output).

Units

Output

Configuration

Commissioning

Specifies the units of measurement for Present Value (Appears as I1). For the PAO, the units can only be set to %.

Use COV Min Send Time

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.

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

Output

All Modes

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.