Honeywell VRX180 Engineering, Feedback, Feedforward, Gain Force Remote, Man, GAIN/PROP Band

				Programming Function Blocks and Features
			Table 4-10 Loop Prompts (continued)
	Prompt		Range/Selections	Definition
	ENGINEERING		Select letter	Units of measure for values of process variable or set point
	UNITS			which will appear on Online loop displays.
	FEEDBACK		OFF, analog parameter,	Provides verification to the loop that the loop output request
			number	(LP OV) was achieved by the analog output module (AO).
				Feedback sources are typically pointed to the associated
				Back Calculation Value (BC) of an analog output module.
				Feedback inputs must have a span equal to the loop output
				span when they are not pointed directly to analog output
				modules.
	FEEDFORWARD		OFF, analog parameter,	Modifies the control loop output independent of the PID
			number	calculation. The range of the value should not exceed 0 to
				100 units. Feedforward is typically used to provide an output
				change in anticipation of a change to the loop process
				variable.
	FEEDFORWARD		-10.00 to 10.00	Applies gain to the feedforward input value.
	GAIN
	FORCE REMOTE		OFF, discrete parameter, 0,	When discrete is ON(1), forces loop from automatic mode to
	MAN	1		remote manual mode. In remote manual, loop output is
				determined by the OUTPUT TRACKING value and the local
				Down Arrow and Up Arrow buttons for manual output
				adjustment are disabled. In remote manual the automatic
				indicator (AUTO) of the display will flash. Selecting Manual
				mode from the Auto/Manual button will override remote
				manual operation.
				When the loop’s Set point #2 is programmed as the Set point
				Profiler (SPn OV), Force Remote manual should be
				programmed as OFF.
GAIN/PROP BAND			PB or GAIN	Select whether gain or proportional band will be used for
				tuning the control loop.
GAIN#1 OR GAIN#2		Enter a value of 0.1 to 200		Gain is the proportional gain entry for the control loop (The
			for Gain, or 0.5 to 1000.0 for	value entered here is the gain applied to the error signal to
			Proportional Band. Enter	determine the loop output). For example, a 10% change in
			OFF to allow integral only	process variable (with respect to the input range) from a
			control. (Variable Gain1 or	balanced condition will result in a 10% change in output,
			PB1 is available by	when a gain of 1.0 is used. Enter a starting value at initial
			programming a constant's	configuration. The value may be altered Online for final loop
			Destination with GN or PB.	tuning. If an indirect source is specified as in an adaptive
			See Program Constants,	gain configuration, the value can only be altered at the
			Section 4.16.)	source.
				Gain and Proportional Band are interchangeable values
				(Proportional Band = 100/Gain). For loops with dual tuning,
				Gain 1 is the gain for the first set of tuning parameters. Gain
				2 is for the second set.
	HYSTERESIS		Enter 0-100% of PV span	Deadband value prevents excessive output oscillation when
				using ON/OFF control.

Video Recorder – User Manual 95