I have a question. i have a program programmed in SCL.

I get back a value in the format of a DWORD.This can be a negative or a positive value.

I want to always convert it to a positive number. Is there a command or program too achive this?

In STL you have the NEGI command for this, butt dont know if you have something like this in SCL.

Hope you guys can give me tip

Thanks a lot

In STL for S7-300/400 NEGI and NEGD are used to generate second complement of an input.They are categorized as conversion functions in STL ,but you can not find them in SCL counterpart list.I think this is because the second complement is only multiplication of input by -1 and the same result generated.

To have INVI and INVD (1st complement) in SCL,you can XOR the entire bit pattern with W#16#FFFF and DW#16#FFFFFFFF respectively.Simply adding 1 to generated value will outcome a 2nd complement.

I hope this is what you asked!
Hamid Hosseini

Thanks very much