12. Faults12.4 Functionality of the NET faulty12.4 Functionality of the NET faultyNOTICEYou can make a visual check the functionality of the NET by means ofthe NET LED and in the circuit diagram via diagnostics bit ID01-ID08.Checking the functionality of the NET using the NET LEDStatus of theNET LEDDescriptionOff NET not operational, fault in configurationContinuous light NET station fault - possible causes:l Net is initialized and at least one station has not been detected. Check the plug-inconnections.l You have modified the NET ID or baud rate for at least one station after the con-figuration has been completed. Change the configuration.l You have deleted the program on a NET station and thus also its NET configuration.Reconfigure the NET via station 1.l You have expanded an existing NET station and replaced it with a new devicewhich cannot be assigned parameters.Flashing NET operating fault-free12.4.1 Monitoring based on diagnostic bitsDiagnostic bits ID01 - ID08 provide information on the presence or absence of NET sta-tions. The state of the diagnostic bits is defined by the reception of a sign of life signalthat every NET station sends.If the sign of life signal of a configured NET station is no longer received, the diagnosticsbit ID01-ID08 for the missing NET station is immediately set to 1 for all remaining sta-tions.The sign of life signal is sent cyclically depending on the baud rate.The presence of the configured NET stations is evaluated at the following time intervals:Baud Rate Station must send a “sign of life”every ...Station detects a missing signof life signal from …[Kbit/s] [ms] [ms]1000 60 180500 60 180250 120 360125 240 72050 600 180020 1500 450010 3000 9000Table 107: NET station time intervalseasyE4 11/18 MN050009 EN www.eaton.com 571
