OPTIONAL FEATURES11-10 Edition One XC1000 ServiceWhen both the green RDY LED and the yellow BSY LED are lit for achannel, an error has occurred for that channel. The red ERR LED is alsolit during this condition. When neither the green RDY LED nor the yellowBSY LED is lit, the relay contacts have not been connected. The switchmight not be connected to the line or a voltage of less than 20 Vdc ispresent when the MB and MB1 lines are open.11.5.2.2 Error Reporting and Diagnostics. The numeric display window on thefront panel shows an error code when an error has occurred. The errorcodes are defined as follows: AA User Error. An AA error in the CHANNEL window can be causedby pressing the Change Channel and Increment Channel switches atthe same time or by changing relay 0 in an alarm configuration. CC Watchdog Error. A CC error appears in the CHANNEL windowwhen the processor has malfunctioned and the Busy-Out Controllerrebooted. D1 CPU Error. A D1 error appears in the CHANNEL window when apower problem has occurred on the busy-out PCB. D2 CPU Error. A D2 error appears in the CHANNEL window whenpower problem has occurred on the second busy-out PCB.To clear these errors, press the Increment Channel switch.11.6 STANDBY REDUNDANCYThe Standby-Redundancy feature allows the XC1000 to recover quickly ifthe CPU card or system and message file cards fail. The feature is availableonly with a dual-cabinet XC1000. This functionality is possible because thedual-cabinet XC1000 can contain two full sets of the common-control cardsunder special software control. To achieve this capability, new CPU,monitor, and file cards must be installed, with new CP I/O cables andterminator boards. The C10 CPU card is replaced with two C20 CPUcards, P/N 244–2053–010, and the F10 file card is replaced with two F20file cards, P/N 244–2054–010. A new monitor card, P/N 244–2030–002,must also be installed. Standby redundancy can be installed using theStandby Redundancy Upgrade kit, P/N 278–1080–000.Standby redundancy uses two sets of common-control cards. One set of thecommon-control cards, the active set, is responsible for running theXC1000 at any time. The standby set of common-control cards is isolatedfrom the active set. The active card set performs normal operations and theactive CPU checks the standby card set to verify the health of the inactivecard set. An entry is placed in the status log if any of the standby cardsfail any diagnostic tests. The system manager configures the conditionsthat control the switchover from the active set to the standby set. WhenXC1000 detects a condition for switchover on the active set, the systemreboots and switches operation to the standby set. When a switchoveroccurs, the complete card set is switched; individual cards cannot beswitched. Service is lost during the switchover because the XC1000 mustreboot to activate the standby set.SECTION 11.5 – 11.6
