Problem with my own function in tag logging

1. I create internal tag of type Floating point 64bit IEEE 754 with startig value 20.
2. I write C-function (copy from example):
   [code]double Wurzel (double doLmtValue,double doValue,int dwCount,BOOL Archivierung)
   {
   return sqrt(doValue);
   }[/code]
3. I create Analog process value archive with cycles - 1 second and processing - action and select my function Wurzel.

Dear Enginu,

your function Wurzel have 4 parameters as inputs, where in the tag loggingconfiguration the only parameter for the function is your archived tag.

try:

doubleWurzel(doubledoValue)

{

returnsqrt(doValue);

}

and check if it will work,
regards,
rami