Function block dynamos, faceplates, and detail displays > Function block detail display reference

Fieldbus PID function block detail display (FFPID_DT)

Figure: DeltaV Operate View of the Fieldbus PID Function Block Detail Display (FFPID_DT)

The following items are contained in the FFPID function block detail display:

  • Tune with InSight button - Press this button to start DeltaV InSight in the context of this block.

  • Limits:

    • Hi Hi Lim - This area displays the maximum value of the PV in engineering units before the high high limit active bit (HI_HI_ACT) is set. Click this field to enter a new limit.

    • Hi Lim - This area displays the maximum value of the PV in engineering units before the high limit active bit (HI_ACT) is set. Click this field to enter a new limit.

    • Dev Hi Lim - This area displays the maximum positive deviation of the PV from SP in engineering units before the high deviation limit active bit (DV_HI_ACT) is set. Click this field to enter a new limit. The valid input range for this value is 0 to + PV span.

    • Dev Lo Lim - This area displays the maximum negative deviation of the PV from SP in engineering units before the low deviation limit active bit (DV_LO_ACT) is set. Click this field to enter a new limit. The valid input range for this value is 0 to + PV span.

    • Lo Lim - This area displays the minimum value of the PV in engineering units before the low limit active bit (LO_ACT) is set. Click this field to enter a new limit.

    • Lo Lo Lim - This area displays the minimum value of the PV in engineering units before the low low limit active bit (LO_LO_ACT) is set. Click this field to enter a new limit.

    • Out Hi Lim - This area displays the maximum value of the output in engineering units. Click this field to enter a new limit. The valid input range for this value is -10 to 110 % of the output scale in engineering units.

    • Out Lo Lim - This area displays the minimum value of the output in engineering units. Click this field to enter a new limit. The valid input range for this value is -10 to 110 % of the output scale in engineering units.

    • SP Hi Lim - This area displays the maximum value of the SP in engineering units. Click this field to enter a new limit. The valid input range for this value is -10 to 110 % of the PV Scale in engineering units.

    • SP Lo Lim - This area displays the minimum value of the SP in engineering units. Click this field to enter a new limit. The valid input range for this value is -10 to 110 % of the PV Scale in engineering units.

    • Alm Hysteresis - This area displays the alarm hysteresis (or deadband) value for the alarm conditions in % of PV Scale. Click this field to enter a new value. An alarm condition does not recur until the PV has backed away from the corresponding limit by at least the % of PV Scale specified by this value.

  • Tuning:

    • Gain - This field indicates the gain used in the PID algorithm. Click this field to enter a new value.

    • Reset - This field indicates the integral time constant used in the PID algorithm. Click this field to enter a new value.

    • Rate - This field indicates the derivative time constant used in the PID algorithm. Click this field to enter a new value.

    • PV Filter TC - This field indicates the PV filter time constant in seconds. Click this field to enter a new value.

    • SP Filter TC - This field indicates the SP filter time constant in seconds. Click this field to enter a new value.

    • SP Rate Dn - This field indicates the maximum negative change to the WORKING_SP in engineering units that is allowed per second. Click this field to enter a new value. A value of 0.0 indicates that no rate limiting will be done.

    • SP Rate Up - This field indicates the maximum positive change to the WORKING_SP in engineering units that is allowed per second. Click this field to enter a new value. A value of 0.0 indicates that no rate limiting will be done.

    • FF Gain - This field indicates the gain used in the feedforward algorithm. Click this field to enter a new value. This field is visible whenever FF_ENABLE is True.