Attributes (Heat Exchanger with Return Water Control) - 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

The following table describes the attributes used by the Heat Exchanger with Return Water Control modules:

Table 1. Heat Exchanger with Return Water Control Attributes

Name

Type 1

Description

Default Value

Compensator Cmd

 

Controls the heat exchanger valve. The valve is commanded from 0% to 100%. This output incorporates the Lead Compensator.

0.0

Display Units: %

Control Status

V

Provides the PID status with possible values of Normal, Overridden, Disabled, Low, Timing Low, High, and Timing High.

Normal

Set Name: Control Status

Low Limit Process Variable

 

Provides the low limit temperature process variable.

38 °C, 100 °F

Low Limit Proportional Band

 

Provides the range across which the valve is proportionally modulated open as the Low Limit Process Variable drops below the Low Limit Setpoint.

5 °C, 9 °F

Low Limit Setpoint

 

Provides the upper threshold for the low limit temperature, below which the heating supply water valve is proportionally modulated open during normal control modes.

38 °C, 100 °F

Mode

 

Indicates the mode of operation for the module.

Off

Set Name: Off/Max/Control

Output Overridden

 

Indicates when the actual output controlled by this output is overridden by a user.

False

Output Position

 

Provides the current Present Value of the output that this controller drives.

0%

PID Tuning Reset

 

Causes the PID objects to reset their tuning parameters to the default based on the appropriate Process ID.

Normal

Set Name: PID Tuning Reset

Percent Cmd

V

Controls the heating supply water valve.

0.0%

Percent Request

V

Contains the output requested by the control before being limited based on the Low Limit Process Variable. This attribute provides bumpless transfer between state sections.

0.0%

Process ID

 

Indicates the type of heating process being controlled by the device when the mode is Control.

ZN-T

Set Name: Process ID

Process Units

 

Specifies the units for the heating PID. For this particular module, the only two valid values are °C and °F.

°C, °F

Set Name: Unit

Process Variable

 

Provides the control temperature.

0.0

Setpoint

 

Provides the control temperature setpoint.

0.0

State

G

Provides the operating state output as determined by the Mode input.

Off

Set Name: Off/Max/Control

1 C - Configuration Mode Only, G - Default Element (Generated State, if applicable), SC - Simulation and Commissioning Modes Only, V - Calculated Value (Outputs)