Citect - Comparing 6 variables and indentifiing the Variable with Highest value ?

[EICS]

This is a Citect SCADA question

I have Six variables of type REAL (Float) to compare and determine (identify) which variable has the highest value and then identify that Variable name.

Lets Call them

VarA = 5, VarB = 60, VarC = 45, VarD = 145, VarE = 90, VarF = 128

I'm struggling to find a way to do this logic simply and easily.


i need to identify which variable has the highest value example "VarD"


any Suggestions from the wealth of knowledge on this forum welcomed.

 

[EICS]

Sorry, cancel request i worked it out with citect
function max where it can compare 2 variables for the higher value, did this a few times for a good result.

FUNCTION
TEST()

STRING sTagbase;

REAL rTestA = 105;
REAL rTestB = 20;
REAL rTestC = 305;
REAL rTestD = 140;
REAL rTestE = 250;
REAL rTestF = 6;

REAL rTestMax;

WHILE True DO

// compare
rTestMax = Max(rTestA, rTestB);
IF rTestmax = rTestA THEN
rTestMax = Max(rTestA, rTestC);
ELSE
rTestMax = Max(rTestb, rTestC);
END // rTest max will have the highest value of A, B or C

rTestMax = Max(rTestC, rTestD);
IF rTestmax = rTestC THEN
rTestMax = Max(rTestC, rTestE);
ELSE
rTestMax = Max(rTestD, rTestE);
END // rTest max will have the highest value of A, B, C, D or E

rTestMax = Max(rTestE, rTestF);
IF rTestmax = rTestE THEN
rTestMax = rTestE;
ELSE
rTestMax = rTestF;
END // rTest max will have the highest value of A, B, C, D, E or F

IF rTestMax = rTestA THEN
sTagbase = "FM_D1FIB1";
ELSE IF rTestMax = rTestB THEN
sTagbase = "FM_D1FIB2";
ELSE IF rTestMax = rTestC THEN
sTagbase = "FM_D1FIB3";
ELSE IF rTestMax = rTestD THEN
sTagbase = "FM_D1FIB4";
ELSE IF rTestMax = rTestE THEN
sTagbase = "FM_D1FIB5";
ELSE IF rTestMax = rTestF THEN
sTagbase = "FM_D1FIB6";
END;END;END;END;END;END;

 

[Geoff White]

Brute force works well too.
if a>b and a>c and a>d and a>e and a>f then a

 

[EICS]

yes well done.... sometimes you get bogged down and miss the simple things

another 20 mins earlier and i would have used your suggestion.

Thanks Geoff for your reply.

 

[Lare]

Brute force works well too.
if a>b and a>c and a>d and a>e and a>f then a

But this only shows if a is biggest, you need also compare b,c,d,e,f separatetly.


another code:




value_max:= -32767
tag_number := 0

if in1 > value_max then
value_max = in1
tag_number = 1
end_if

if in2 > value_max then
value_max = in2
tag_number = 2
end_if

if in3 > value_max then
value_max = in3
tag_number = 3
end_if

if in4 > value_max then
value_max = in4
tag_number = 4
end_if

if in5 > value_max then
value_max = in5
tag_number = 5
end_if