A communication system for automation equipment on a TCP/IP network. The automation equipment controls an automation application by executing an application program written according to standard IEC1131-3. The communication system includes at least a reception WEB function block integrated into the application program to implement a WEB server function, and/or at least one send WEB function block integrated into the application program to implement a WEB client function, and an HTTP interface capable of routing messages between the TCP/IP network and WEB function blocks identified by a URL address. The contents of HTTP requests may be an XML frame or a UEL encoded frame.