Attributes (Sideloop PI Proportional Output) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

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Johnson Controls
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Controller Configuration Tool
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User Guide
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The following table describes the attributes used by the Sideloop PI Proportional Output module.


Make sure the Process ID and Process Units attributes are set according to the needs of your system. If the Process ID selected is Airflow, Airflow Diff, or Other, the you must set the Process Range as necessary. The Process Range must be greater than zero. If Process ID is Other, the user should configure the Time Constant and Process Dead Time attributes from the details view of the PID Pre-Processor logic block inside the module’s logic view. See the PID Pre-Processor logic block description and the Process ID Configuration Restrictions in the Control topic of the Logic section for details.

Table 1. Sideloop PI Proportional Output Attributes


Type 1


Default Value

Compensator Cmd


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


Display Units: %

Control Status


Current status of the module.

Set Name: Control Status

Direct Acting


Signals the action of the PID: True = Direct Acting, False = Reverse Acting. Direct acting control is used in applications where an increase in the process variable causes the controller’s present value to increase. An example of direct acting control is temperature control with a cooling coil. With reverse acting control, an increase in the process variable causes the control present value to decrease. Temperature control with a heating coil, flow rate control, and static pressure control applications are three examples of reverse acting control.


EFFSL-SP (Setpoint)


Contains the desired setpoint for the process variable to be controlled to when commanded to Control.

22 °C, 72 °F



Allows the state to be set to Off, Max, Hold, or Control.


Set Name: Off/Max/Control/Hold

Output Overridden


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


Output Position


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


Percent Cmd


Controls the single actuator that is providing cooling or heating.

Display Units: %

PID Tuning Reset


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


Set Name: PID Tuning Reset

Process ID


Use to specify the process that is being controlled.


Set Name: Process ID

Process Range


Magnitude of the range that the PID Process Variable traverses as the PID Present Value varies between its minimum and maximum values. You do not need to configure this parameter unless Process ID = Airflow or Airflow Diff. In these cases, Process Range should be configured to the design maximum flow rate of the controlled device. For other Process ID values, the effective process range is determined automatically from the standards table.

22 °C, 40 °F

Process Units


Specifies the units for the PID.

°C, °FSet Name: Unit

Process Variable


Specifies that when Mode is commanded to Control, this is the variable that is controlled and must therefore respond to changes in the output. For example, it can be connected to the Zone Temperature.

22 °C, 72 °F

SL-ABSEFFORT (SL Absolute EWMA Effort)


Provides an EWMA based on the absolute value of (Current Present Value - Last Present Value). The PID computes this value.


Display Units: %

SL-ABSERROR (SL Absolute EWMA Error)


Provides an EWMA based on the absolute value of (Setpoint - Process Variable). The PID computes this value.


Display Units: °C, °F



Provides an EWMA based on the difference of (Setpoint - Process Variable). The PID computes this value.


Display Units: °C, °F

SL-EWMA (SL EWMA Present Value)


Provides an EWMA of the Present Value. The PID computes this value.


Display Units: %


G, V

Current State of the module.

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)