Experimental Physics and
Industrial Control System

Benjamin Franksen <[email protected]> · Thu, 20 Nov 2008 13:57:42 +0100

On Thursday 20 November 2008 11:57, marco_hair wrote:
> Dear all:
>
>   in the aiExample.db coming with soft ioc template,
> record(ai, "$(user):aiExample")
> {
> 	field(DESC, "Analog input")
> 	field(INP, "$(user):calcExample.VAL  NPP NMS")
> 	field(EGUF, "10")
> 	field(EGU, "Counts")
> 	field(HOPR, "10")
> 	field(LOPR, "0")
> 	field(HIHI, "8")
> 	field(HIGH, "6")
> 	field(LOW, "4")
> 	field(LOLO, "2")
> 	field(HHSV, "MAJOR")
> 	field(HSV, "MINOR")
> 	field(LSV, "MINOR")
> 	field(LLSV, "MAJOR")
> }
> record(calc, "$(user):calcExample")
> {
> 	field(DESC, "Counter")
> 	field(SCAN,"1 second")
> 	field(FLNK, "$(user):aiExample")
> 	field(CALC, "(A<B)?(A+C):D")
> 	field(INPA, "$(user):calcExample.VAL  NPP NMS")
> 	field(INPB, "9")
> 	field(INPC, "1")
> 	field(INPD, "0")
> 	field(EGU, "Counts")
> 	field(HOPR, "10")
> 	field(HIHI, "8")
> 	field(HIGH, "6")
> 	field(LOW, "4")
> 	field(LOLO, "2")
> 	field(HHSV, "MAJOR")
> 	field(HSV, "MINOR")
> 	field(LSV, "MINOR")
> 	field(LLSV, "MAJOR")
> }
> the ai value will change from 0-9 and then loop from 0 again.
> if I want to generate the value from 0-9, then decrease it, such as 9-0.
> That is, the value increase from 0-9, then decrease from 9-0 one by one,
> how can I written it? Thanks a lot for your help.

You need at least one more record because the calc record can remember only 
one value. For counting up and down you need two: the current value of the 
counter and whether you are ramping up or down. I'd say add another calc 
record, something like this (untested, but you should get the idea):

record(calc, "$(user):upOrDown")
{
	field(CALC, "(A==B)?(-1):((A==D)?1:A)")
	field(INPA, "$(user):calcExample.VAL CPP")
	field(INPB, "$(user):calcExample.B CPP") # high limit
	field(INPD, "$(user):calcExample.D CPP") # low limit
}

and change INPD of $(user):calcExample to

	field(INPC,"$(user):upOrDown CPP") # increment

Cheers
Ben
-- 
"Programming = Mathematics + Murphy's Law" (E.W.Dijkstra)

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System