Honeywell VRX180 Manuale Utente

 

 

Table 4-8  Loop Characteristics (continued) 

Split output programming 
requirements 

A splitter output type (Standard or Advanced) calculated value is used to send 
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 
characteristics 

Other parameters affecting loops are latching and reset limit.  These are 
described in the loop prompt table. 

 

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.