Linking to Delphi (API interface) Necessary files The following files are needed in order to link the DLL into Delphi programs: TcAdsDll.dll - dynamic function library

 https://infosys.beckhoff.com/english.php?content=../content/1033/tcsample_bdelphi/html/TcAdsDLL_COM_Delphi_Setup.htm&id=

 Linking to Delphi XE2 (COM interface)

The TcAdsDll.dll type library has to be imported (TcAdsDll_TLB.pas unit). Depending on the Delphi version, manual adjustments may be required in order to ensure error-free translation.
Requirements

    Delphi XE2;
    TwinCAT 2.9 or higher;
    TcAdsDll.dll - dynamic function library located in the Windows NT/2000 /XP/... 'System32' directory.

Import Type Library

1. Select Component -> Import component menu command. In dialog window select the option: Import type library and confirm with the Next button.