Hello!

I just successfully tested LOGO math possibilities. The accurate sin function UDF was created.
The math FB can do wonders! The sine function from any integer value gives the result multiplied by 1000 "msine" mili sine. The result is accurate to the last digit. Theoretically by rounding error could be +/- 0.5, but in reality I get +/- 0.6. The 34 FB used.

Right now I don't need such accuracy, but the solution could be good exercise for students  to teach PLC and trigonometric.

The real sine oscillations (not rounded triangular signal) could be done also without sine calculator by using only 10 FB (including PI controller) as showed in attached picture. The sum of two sine with different frequency and amplitude could provide "real looking" signal data for some demonstrations or software testing.

A nice picture with a sine curve, but only the UDF itself would be helpful for other members.

Regards, Scorp

OK!

The complete sine UDF test program in attachment

Is there a some protected way to publish UDF? If not I will publish it anyway.

I just want some response to my solution. I also made program that use the same UDF for cosine and tangent calculations.

ixo65

The next time and you ask for a problem, then I make a program with the solution in the UDF ...

 Hello, You just say that my conversation is not very correct/polite for the user forum? Sorry, I just want to share my joy that I made some success in LOGO programming.

Hello again!

I just tested on other computer that UDF could be grabbed from the example provided and even used in other program!
You can even expand it if the correct password is inserted (password "logom").
OK, the UDF will be with red question mark on it. So I add the UDF in attachment.
There is also other UDF inside this UDF and I don't now the correct version right now.