FFPid_dt (Fieldbus PID function block detail display)

Configuration view of the Fieldbus PID detail display (FFPid_dt)

The FFPid_dt is used with the PID function block used with a Fieldbus PID Loop module. The following sections describe the major components that are present on the FFPid_dt.

Alarm icon

Shows the highest priority alarm for that module. The following table shows the alarm icon for each alarm priority and state.

	Active acknowledged	Active unacknowledged	Inactive unacknowledged	Suppressed
Critical alarm
Warning alarm
Advisory alarm

Note:

The suppressed alarm icon is visible only when no other active or unacknowledged alarms exist.

Faceplate button

Opens the module faceplate display.

Limits

Hi Hi Lim

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

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

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.

Dev Lo Lim

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.

Lo Lim

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

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.

Out Hi Lim

The maximum value, in engineering units, of the output. 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

The minimum value, in engineering units, of the output. 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

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

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

The alarm hysteresis (or deadband) value for the alarm conditions in % of OUT 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 OUT Scale specified by this value.

Tuning

Gain

The gain used in the PID algorithm.

Reset

The integral time constant used in the PID algorithm.

Rate

The derivative time constant used in the PID algorithm.

PV Filter TC

The PV filter time constant in seconds.

SP Filter TC

The PV filter time constant in seconds.

SP Rate DN

In engineering units, the maximum negative change to the WORKING_SP that are allowed per second (SP_RATE_DN). Click this field to enter a new value. A value of 0.0 indicates that no rate limiting will be done.

SP Rate UP

In engineering units, the maximum positive change to the WORKING_SP that are allowed per second (SP_RATE_UP). Click this field to enter a new value. A value of 0.0 indicates that no rate limiting will be done.

IDeadband

The integral deadband. When the error (WORKING_SP minus PV) is less than this value, integral action stops.

When the Structure is PD or P–D, Bias replaces this value.

FF Gain

The feedforward gain (FF_GAIN). This field is visible when FF_ENABLE is True.

Beta

The fraction of proportional action taken on error versus PV. The valid input range is 0.00 to 1.00. This field is visible when STRUCTURE is set to Two Degrees of Freedom Controller.

Gamma

The fraction of derivative action taken on error versus PV. The valid input range is 0.00 to 1.00. This field is visible when STRUCTURE is set to Two Degrees of Freedom Controller.

Adaptive Mode

The Actual and Target modes. Click the drop–down arrow to change the Target mode.

DeltaV Insight button

Launches DeltaV InSight in the context of this module.