N1 PID Loop Attributes - Metasys - LIT-1201793 - Software Application - Metasys Site Management Portal - 12.0.50

Metasys Site Management Portal Help
Product
Building Automation Systems > Building Automation Systems > Metasys Site Management Portal
Document number
LIT-1201793
Version
12.0.50
Revision date
2023-06-02

This object contains attributes common to many Metasys system objects. These common attributes are described in the Common Object Attributes section. This section includes attributes of the Focus/Configuration tab, the Diagnostics tab (if applicable), and any other tab specific only to this object. See the Object and Feature Tabs section for information on the attributes that appear on the other tabs of this object (for example, the Hardware and Options tab appear on point objects).

Note: In the Notes column, letters indicate the following: In the notes column, letters indicate the following: C - Configurable, D - Default Attribute for Display, N - Value Not Required, R - Affected by Extension’s Reliability, W - Writable.
Table 1. N1 PID Loop Object Attributes - Focus/Configuration Tab

Attribute Name

Notes

Initial Value

Values/Options/Range

Description

COV Increment

C,W

0.1

Any value > 0

Defines the minimum change in the Present Value required for the object to report a change.

Device Type

C,N,W

  

20 Character Limit

Contains a description of the physical device connected to the object.

Display Precision

C,W

10ths

  

Defines the decimal rounding and the decimal places to display for the Present Value and associated attributes.

Feedback

      

Indicates the Feedback value, which results from the PIDL Input Conditioning process. This process scales each of the six PIDL inputs and determines a sum, a maximum, or a minimum.

Max Value

C,W

1.7E38

  

Defines the highest reliable value (in engineering units) for the Present Value.

Min Value

C,W

-1.7E38

  

Defines the lowest reliable value (in engineering units) for the Present Value.

Out of Service

C,W

    

De-couples the object from the physical input. When Out of Service is True, the object de-couples the Setpoint and Reliability from the hardware. The Reliability is writable when Out of Service is True. When de-coupled, the Setpoint can be changed to simulate specific conditions or for test purposes.

Present Value (Value)

D,N,R,W

    

Represents the current value of the object.

Reliability

W

0

No Fault Detected (Reliable), Open Loop, Shorted Loop, No Output, Unreliable Other

Indicates whether the Setpoint is unreliable.

Examples:

  • Reliable - No detectable faults

  • Unreliable High - Setpoint is greater than the Max Value.

  • Unreliable Low - Setpoint is less than the Min Value.

When Out of Service is True, the Reliability attribute may be written directly.

Setpoint

      

Indicates the desired value for the control loop feedback signal.

Units

C,W

No units

  

Contains the engineering units for the Present Value attribute.