XI/ON: XN-1RS232 09/2011 MN05002013Z-EN www.eaton.com 412 Integrating the Module in PROFIBUS-DPFunction blocks for SIMATIC S7Table 16: Output variables of FBSRRSXXXVariable MeaningBusyRecv 1: Data is currently being received.0: Data is currently not being received.RecvDataCnt Number of received data bytes. A maximum of 65536bytes is possible.BusySend 1: Data is currently being transmitted.0: Data is currently not being transmitted.SendDataCnt Number of transmitted data bytes. A maximum of 65536bytes is possible.RETVAL Return values of the function (status or error code)0000hexEverything OK. No error8008hexParameter error8010hexCommunication error: Hardware error8020hexCommunication error: Data flow control error8040hexCommunication error: Frame error8080hexCommunication error: Module buffer overflow8100hexVariable error: Incorrect “RecvData” parameter8101hexVariable error: Incorrect “RecvData” parameter data type8102hexVariable error: Incorrect “RecvData” parameter length8200hexVariable error: Incorrect “SendData” parameter8201hexVariable error: Incorrect “SendData” parameter data type8202hexVariable error: Incorrect “SendData” parameter lengthRETVALSFC14 See manual “System software for S7-300/400, SFC14”RETVALSFC15 See manual “System software for S7-300/400, SFC14”