PDOSE preact adjustment, rate, quantity

Auto adjust preact after each delivery

. Select to adjust the

Preact

quantity automatically based on the actual versus setpoint quantity after each successful delivery. When this check box is cleared, the Preact setting remains at the value entered on the

General

tab and is not adjusted.

Slow to dribble before complete

. Select this check box to command the equipment to slow to the dribble rate as delivery nears completion. Slowing to the dribble rate improves the accuracy of quantity delivered.

Delivery equipment has feedback

. Select this check box if the controlled equipment provides feedback of its running, dribbling, and stopped status to the PDOSE instruction. The instruction checks that the equipment is performing the commanded function and provides a status (and optional alarm) if the equipment fails to respond as commanded within the time configured in the

Time for equipment feedback before fault

setting on the

Advanced

tab.

Clear this check box if the controlled equipment does not provide feedback of its status. The instruction assumes that the equipment is performing the commanded function and does not check for a failure to respond.

Stop delivery on equipment fault

. Select this check box to direct the dosing instruction to attempt to stop the controlled equipment if an equipment fault is reported through Inp_CtrldEqupFault or detected through equipment feedback. Clear the check box to keep the dosing instruction operating regardless of equipment faults.

Bumpless program/operator transition

. Enables bumpless program/operator transition of the quantity setpoint, dribble quantity, preact, and delivery tolerance threshold settings.

Allow continuous rate monitoring

. Enables continuous monitoring and totalizing without a setpoint requirement.

Loss in quantity: Flow increases quantity (transfer in)

. Designates the instruction as a transfer-in instance.

Loss in quantity: Flow reduces quantity (transfer out)

. Designates the instruction as a transfer-out instance.

Time base for rate

. Sets the time base for the rate as units per second (1), per minute (60), or per hour (3600). To configure a custom time base, enter the number of seconds in the per-time unit of the rate.

Maximum allowed quantity to deliver (setpoint)

. Enter the maximum quantity to deliver. The quantity setpoint cannot exceed this value.

Number of counts in Inp_QtyPV which equal 1.0 EU

. Enter the number of counts in Inp_QtyPV that equal one engineering unit of quantity delivered. The instruction uses this value with pulse output flowmeters and a pulse input I/O card.

Integrated rate to quantity EU multiplier

. Enter the rate to quantity engineering units multiplier. The instruction uses this value if the input is in one unit of measure, such as gallons per minute, and the total is in another that requires conversion to a different unit of measure, such as barrels.

Quantity rollover (total counts for pulse input)

. Enter the quantity rollover. When the quantity reaches this number, the quantity rolls over to zero.

Filter time constant for calculated rate

. Enter a filter time constant. The instruction uses this filter on the calculated rate PV signal to reduce the impact of jitter, scan time, quantization error, or input signal noise.

Integrate Inp_Rate to get quantity

. Selected if the flowmeter provides a rate input but no quantity input. The rate is integrated to calculate quantity.

Differentiate Inp_Qty to get rate

. Selected if the flowmeter provides a quantity input but no rate input. The rate of change in the quantity is used as the rate.

Device state

. When the

Logix Designer

application is online with the controller, displays the current device state.

Device issues

. When the

Logix Designer

application is online with the controller, displays fault conditions.