i found in this forum, not long ago, a compressed file with a libads, provided from visual. Now i come to report some results.
Later i started to develop the support for the beckhoff's official api for ADS, to make an easier use of it under linux.
The result in the github libads's repository: http://github.com/gass/libads/
In the meanwhile i found also 2 other projects: Beckhoff CX1000 linux driver and libbk8000 .
with all this, i started a google group to track beckhoff in linux: http://groups.google.com/group/beckhoff-linux/
please test and use any of this solution and report your results.