Appendix C—Optional Communication Cards230 Power Xpert C445 Global Motor Management Relay MN042003EN—October 2016 www.eaton.comPROFIBUS DiagnosticsThe C445 PROFIBUS communication card uses extendeddiagnostics to provide the status information along with faultand warning data relevant to the operation of the system.Any time a fault condition is present in the system, the“ext.diag.” bit (bit3 in first diagnostic data byte) will be sethigh, indicating to the Master, a high level diagnosticmessage and fault is present. The C445 PROFIBUScommunication card will also set the appropriate word/bit/bits in diagnostic data bytes 11 and 16 to indicate to the userthe reason for the fault/warning condition.When the fault condition is cleared, the “ext. diag.” bit (bit3in first diagnostic data byte) will also clear, indicating to theMaster that the C445 system is healthy and ready foroperation.Table 121. C445 Diagnostic Telegram DetailsBelow picture shows how diagnostics message is sent to Master.Byte No. Description1 to 6 PROFIBUS DP standard diagnostics7 to 10 Extended diagnostics header11 to 12 Active Fault Code (Modbus Register No.312)13 to 16 Warning Status Bits (Modbus Register No.318)
