Chapter 12. DiagnosticsGFK-2224Q January 2017 213Controller Fault User ActionComm_req - Bad task IDprogrammedMessage from PLC for unknown Ethernet Interface task. Check COMMREQfunction block.Comm_req - Wait mode notallowedCheck COMMREQ to make sure sent in no-wait mode.Configured gateway addressbad; can’t talk off local netError in configuration. Verify that IP address, Subnetwork Mask, and defaultGateway IP address are correct.Connection to remote nodefailed; resuming without itUnderlying communications software detects error transferring data;resuming. If persistent error,check connection to LAN and operation of remote node.LAN controller fault; restart LANI/FHW fault, perform a power cycle. If problem persists, contact TechnicalSupport.LAN controller Tx underflow;attempt recoveryInternal system error. If problem persists, contact Technical Support.LAN controller underrun/overrun; resumingInternal system error. If problem persists, contact Technical Support.LAN data memory exhausted -check parameters; resumingThe Ethernet Interface does not have free memory to processcommunications. If problem persists, contact Technical Support.LAN duplicate MAC Address;resumingA frame was received in which the source MAC Address was the same asthis station’s MAC Address. All stations on a network must have a uniqueMAC address. Immediately isolate the offending station; it may benecessary to turn it off or disconnect it from the network. This stationremains Online unless you intervene to take it Offline.LAN I/F can’t init - checkparameters; running soft Sw utlInternal system error. If problem persists, contact Technical Support.LAN I/F capacity exceeded;discarded requestVerify that connection limits are not being exceeded.LAN interface hardware failure;switched off networkReplace the Ethernet Interface.LAN network problem exists;performance degradedExcessive backlog of transmission requests due to excessive traffic on thenetwork. For a sustained period the MAC was unable to send frames asquickly as requested. If problem persists, contact Technical Support.LAN severe network problem;attempting recoveryExternal condition prevented transmission of frame in specified time. Couldbe busy network or network problem. Check transceiver to make sure it issecurely attached to the network.LAN system-software fault;aborted connection resumingInternal system error. If problem persists, contact Technical Support.LAN system-software fault;restarted LAN I/FInternal system error. If problem persists, contact Technical Support.LAN system-software fault;resumingInternal system error. If problem persists, contact Technical Support.LAN transceiver fault; OFFnetwork until fixedTransceiver or transceiver cable failed or became disconnected. Reattachthe cable or replace the transceiver cable. Check SQE test switch if presenton transceiver.Local request to send wasrejected; discarded requestInternal error. Check that the Ethernet Interface is online. If problempersists, contact Technical Support.Memory backup fault; may loseconfiguration/log on restartInternal error accessing non-volatile device. If problem persists, contactTechnical Support. Replace the Ethernet Interface.Module software corrupted;requesting reloadCatastrophic internal system error. Contact Technical Support.
