Specifying configurations

To specify a configuration:
  • Select the
    Configuration
     tab.
  • For any changes to take effect, select
    OK
     or
    Apply
    .
    In this field:
    Specify:
    PID equation
    Select independent gains or dependent gains (.PE).
    Use independent when you want the three gains (P, I, and D) to operate independently. Use dependent when you want an overall controller gain that affects all three terms (P, I, and D).
    Control action
    Select either E=PV-SP or E=SP-PV for the control action (.CA).
    Derivative of
    Select PV or error (.DOE).
    Use the derivative of PV to eliminate output spikes resulting from setpoint changes. Use the derivative of error for fast responses to setpoint changes when the algorithm can tolerate overshoots.
    Loop update time
    Enter the update time (.UPD) for the instruction (greater than or equal to 0).
    CV high limit
    Enter a high limit for the control variable (.MAXO).
    CV low limit
    Enter a low limit for the control variable (.MINO).
    Deadband value
    Enter a deadband value (.DB).
    No derivative smoothing
    Enable or disable this selection (.NDF).
    No bias calculation
    Enable or disable this selection (.NOBC).
    No zero crossing in deadband
    Enable or disable this selection (.NOZC).
    PV tracking
    Enable or disable this selection (.PVT).
    Cascade loop
    Enable or disable this selection (.CL).
    Cascade type
    If cascade loop is enabled, select either slave or master (.CT).
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