12. Faults12.4 Functionality of the NET faultyExampleIn a network run with a baud rate of 250 KB, the NET station NT7 is to be replaced.If you are using a easyE4 device as replacement that is still in its default state and doesnot have a NET-ID, this device is not automatically integrated in the network. Even con-nected to the power supply and the NET, the LED NET remains off. In this case a con-figuration can not be written to it with the configuration software easySoft7(Communications view -> Device list field, NT7).The following procedure ensures fault-free commissioning of the replacement device.Connect the easyE4 replacement device to the power supply and connect it at the sameposition to the NET as the device to be replaced.Switch the device display of all NET stations to Status display.Start the automatic configuration of the NET. However, you can also do this via the pro-gramming software. As an alternative to the automatic configuration, you can alsoswitch the supply voltage of the configured NET stations off and on.All NET stations in the NET configuration will temporarily switch to STOP.12.4.3 Station with NET-ID 1 failsIf the power supply of station NET-ID 1 fails during operation, the other NET stationscan no longer be notified of the associated operating mode change.NET stations with NET-ID 2 - 8 on which REMOTE RUN is activated therefore stay inRUN mode until the missing sign of life is detected. The time until the missing sign of lifeis detected depends on the baud rate and is from 180 - 9000 ms (→ Section "Monitoringbased on diagnostic bits", page 571). Up to this time, a NET station 2 - 8 operates withthe data previously received via the NET.The further behavior of the NET stations 2 - 8 depends on whether REMOTE IO is alsoactivated as well as REMOTE RUN:NET station 2 - 8 with activated REMOTE RUNThis type of NET station sets the data received via the NET to zero. It retains its oper-ating state and sets the diagnostics bit ID1 to 1 (see following safety measure).NET stations 2 - 8 with activated REMOTE RUN and REMOTE IO that function asinput/output devices, i.e. without their own circuit diagramThis type of NET station sets the data received via the NET to zero. It switches to theSTOP mode if the device display is showing the Status menu. The device follows NETstation 1 when it switches back to RUN mode.Safety measure: On every NET station with a program, monitor the diagnostics bits ID..in order to detect a missing NET station as quickly as possible → Section "Monitoringbased on diagnostic bits", page 571.easyE4 11/18 MN050009 EN www.eaton.com 573
