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4 SEND/RECEIVE Interface in the User Program At various points (event and program-controlled) the user program sends data on a connection using the AG_SEND call. At various points in the CPU cycle, the user program accepts the data received on the connection using an AG_RECV call. Note The blocks can also be called more than once in a cycle for the same communication connection. S7-CPs for Industrial Ethernet Configuring and Commissioning Release 09/2007 C79000-G8976-C182-08 A-89