I am running an example application using TwinCAT ADS communication system, got from a colleague. When I give the command to connect to ADS, error ' fail to load tcadsdll.dll file ' appears; I have looked for it on the web but din't find
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This is the FTP page where you can download the packages for ADS development from beckhoff.
Just downlaod the CS_AdsServer.zip file and extract. You will find everything you need included.

robinCTS
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Meister Schnitzel
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You need to install TwinCAT to get the tcadsdll.dll file. You can request a download file on Beckhoff's website for free.

pboedker
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I download TwinCat and Add Reference but I get this error "TwinCAT.Ads.AdsInitializeException: 'ADS could not be initialized because the 'TcAdsDllCe.dll' is not found! Please check DLL search paths!" – Ugur Baran Nov 07 '22 at 05:19