Echelon LonPoint Application and Plug-In - Manual (Page 90)

9-6 PID Controller Functional Block
Presets
This tab appears as follows:
This tab configures the preset tables. Each preset table can contain up to 16
entries. The View Mode field determines which one of the entries is currently being
configured. When the PID is running, the preset tables are indexed by the PID’s
Mode
network variable to determine which value will be used.
Each entry in a preset table specifies the source of the value controlled by the
preset. The source for each value may be the associated network variable or a fixed
preset value. If Use Network Variable is selected, the value from the network
variable is used. If Use Preset Value is selected, the value entered in the
corresponding preset field is used (i.e., the network variable is not used).
The Auto/Manual presets determines whether the PID is in Auto or Manual
operation for this mode. When the PID controller is in Auto operation the PID
Controller will attempt to make the process variable equal to the setpoint. When
the PID controller is in Manual operation the controlled variable will be set to the
value indicated by the Manual Value preset table (i.e., the PID Controller will be
bypassed). This allows you to create a preset in which the controlled variable is set
to a value sent to the PID through the Manual Value network variable or to a
preset value.
The Manual Value and Setpoint presets determine how these values are
obtained. They can be read from their corresponding network variables or set to a