Honeywell VRX180 Decimal, Position Interactive YES, no, Latching YES, no, Manual OFF, Process

Programming Function Blocks and Features

Table 4-10 Loop Prompts (continued)

Prompt		Range/Selections		Definition
IN DECIMAL		Select decimal position	Used for all input parameters of the loop.
POSITION
INTERACTIVE		YES, NO		Select interactive (YES) or noninteractive (NO) for the control
				algorithm operation. Interactive causes the Gain, Rate, and
				Reset terms to interact to make up the proportional term of
				the algorithm (similar to analog controllers). In noninteractive
				the proportional term is simply related to Gain.
LATCHING		YES, NO		Select the desired action required after a failure to the
				failsafe status.
				When the loop’s PV or Set point #2 fails, the downstream
				function block activates its failsafe (See Table 9-3, Default
				condition column). If latching = YES, when the failure is
				corrected the operator must take specific action to cancel
				these failsafe measures and return the loop to normal
				operation. (See Table 9-3 for action needed.) If latching =
				NO, when the failure is corrected the loop will automatically
				return to normal operation with no action needed by the
				operator.
MANUAL OFF		OFF, discrete parameter, 0,		When this discrete input goes ON (1) it causes the control
	1			output to go off.
MANUAL RESET		-100 to +100		This feature functions only when OFF is entered for RESET.
				Enter a value equal to the desired loop output when the
				process variable is at set point. This allows correction of
				output to account for load changes to bring the process
				variable up to set point.
OUTPUT LOW LIM &		OFF or number	For cascade primary loop, set to PV LOW LIMIT and PV
OUTPUT HIGH LIM				HIGH LIMIT of the cascade secondary loop, respectively.
OUTPUT TRACKING		0-100%, Analog parameter,		This will be the loop's output value when the FORCE
		OFF		REMOTE MAN input to the loop is high (1). See Force
				Remote Man.
PROCESS		OFF, analog parameter,		Process variable for the loop.
VARIABLE		number
PROP BAND#1 &				See GAIN#1 OR GAIN#2
PROP BAND#2
PV LOW LIMIT &		OFF or number		Enter the high and low limits for the process variable being
PV HIGH LIMIT				controlled. Loop tuning parameters are based on the span
				selected by the high and low limit values.
PV TRACKING		PV, OFF		A selection of Process Variable (PV) will cause Set point #1
				of the control loop to track the process variable when the
				loop is in Manual mode. A transfer to Automatic mode will
				maintain the tracked set point value as the working set point
				of the loop unless the loop was operating from Set point 2
				prior to the transfer to Manual.

96 Video Recorder – User Manual