Honeywell VRX180 user manual Programming Procedure

Programming Function Blocks and Features

		Table 4-8 Loop Characteristics (continued)
Characteristic		What to be aware of
Split output programming		A splitter output type (Standard or Advanced) calculated value is used to send
requirements		the Split loop output to 2 or 3 different analog output (AO) functions. In this
		case, program the control loop to receive a feedback from the back calculation
		output of the splitter calculated value. In other words, loop Feedback = CVn BC
		(where CVn is a Splitter type calculated value and BC is its output).
		Program the splitter calculated value to accept the back-calculation values (BC)
		of each analog output function block (AO) as its feedback source. In other
		words, CVn FB = AOn BC.
Cascade primary loop	Be sure to scale the cascade primary loop’s output limits to match the process
		variable range of the secondary control loop. (Note: Output scaling is only
		available on the cascade primary type of control loop.) The primary loop
		feedback should be connected to the back calculation value of the secondary
		control loop.
Miscellaneous loop		Other parameters affecting loops are latching and reset limit. These are
characteristics		described in the loop prompt table.

Programming Procedure

To program Control Loops, select "PROGRAM CONTROL LOOPS" in the Main Program Menu. Select a loop to program.

Table 4-9 illustrates the menu selections for the various loop types. See Table 4-10 for an alphabetical listing of these parameters’ descriptions. Enter all desired choices, then repeat the procedure, if desired, for the other Loops.

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