Eaton XN-1RS232 User Manual

2 Integrating the Module in PROFIBUS-DPPROFIBUS-DP data image22 XI/ON: XN-1RS232 09/2011 MN05002013Z-EN www.eaton.comTable 6: Meaning of the data bits (process input):Designation ValueDescriptionBufOvfl; FrameErr;HndShErr; HwFailure;PrmErr0 -255Diagnostics data (identical to the content of thediagnostics telegram).→ Chapter “Diagnostics”This diagnostics data is always shown, irrespectiveof the Diagnostics parameter.→ Chapter“Parameters”STAT 0-1 1: Communication with the data terminal device isnot faulty.0: Communication with the data terminal device isfaulty. A diagnostics signal is sent if Diagnostics =enabled/0 (→ Chapter “Parameters”). The diag-nostics data indicates the cause of the communi-cation fault. → Chapter “Diagnostics”This bit must be reset by the user program withSTATRES in the process output data field.TX_CNT_ACK 0-3 The value TX_CNT_ACK is a copy of the valueTX_CNT. The value TX_CNT was transferredtogether with the last data segment of the processoutput data.The value TX_CNT_ACK is an acknowledgement ofsuccessful acceptance of the data segment usingTX_CNT.RX_CNT 0-3 The value RX_CNT is linked and transferredtogether with every data segment of the processinput data. The sequence of the RX_CNT values is:00->01->10->11->00...(decimal: 0->1->2->3->0...)A faulty sequence indicates that data segmentsare missing.RX_BYTE_CNT 0-7 Number of valid bytes in this data segment. In theProfibus-DP fieldbus, a data segment consists ofup to 6 user data bytes.