Appendix C. System Controller Messages
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## Appendix C. System Controller Messages

Tables C-1 through C-3 list messages that can appear in the System Controller's event history log.

Table C-1. System Events - Immediate Power-off

Error Message | Failure Area/Possible Solution
--- | ---
POKA FAIL | The System Controller detects a power supply fault and initiates the power-off sequence (except 48V).
POKB FAIL | Same as above.
POKC FAIL | Same as above.
POKD FAIL | Same as above.
POKE FAIL | The System Controller detects a power supply fault. The condition is logged but no power-off sequence is initiated.
BRD/CHASSIS OVR TEMP | The System Controller detects an over-temperature condition and initiates a power-off sequence.
POWER FAIL WARNING | The System Controller detects an AC power failure.
NO SYSTEM CLOCK | The System Controller could not detect a system clock on the backplane/midplane, and initiates a power-off sequence.
1.5V OVER VOLTAGE | The System Controller detects a power supply fault and initiates a power-off sequence. The System Controller will not turn power on until the operator selects “MENU - System Log.” This process guards against overvoltage damage by forcing the operator to examine the System Event Log.
5VDC OVER VOLTAGE | Same as above.
12VDC OVER VOLTAGE | Same as above.
-5.2VDC OVER VOLTAGE | Same as above.
-12VDC OVER VOLTAGE | Same as above.
48VDC OVER VOLTAGE | Same as above.
1.5VDC UNDER VOLTAGE | The System Controller detects a power supply fault and initiates the power-off sequence.
12VDC UNDER VOLTAGE | Same as above.
-5.2VDC UNDER VOLTAGE | Same as above.
-12VDC UNDER VOLTAGE | Same as above.
48VDC UNDER VOLTAGE | Same as above.
1.5VDC HIGH WARNING | The System Controller detects a voltage out-of-range. The condition is logged but no power-off sequence is initiated.
1.5VDC LOW WARNING | Same as above.
5VDC HIGH WARNING | Same as above.
5VDC LOW WARNING | Same as above.
12VDC HIGH WARNING | Same as above.
12VDC LOW WARNING | Same as above.
-5.2VDC HIGH WARNING | Same as above.
-5.2VDC LOW WARNING | Same as above.
-12VDC HIGH WARNING | Same as above.
-12VDC LOW WARNING | Same as above.
48VDC HIGH WARNING | Same as above.
48 VDC LOW WARNING | Same as above.
POWER CYCLE | The System Controller receives a command to perform a power-off, followed by a power-on, from the System Controller serial port.

Table C-2. System Events - Delayed Power-off

Error Message | Failure Area/Possible Solution
--- | ---
AMBIENT OVER TEMP | The System Controller detects an over-temperature condition. An alarm is sent to the CPU, five seconds later the System Controller initiates the power-off sequence.
BLOWER A FAILURE | The System Controller detects a fan problem. An alarm is sent to the CPU, five seconds later the System Controller initiates the power-off sequence (rackmount systems only).
BLOWER B FAILURE | Same as above (rackmount systems only).
BLOWER FAILURE | Same as above (deskside systems only).
BLOWER A RPM FAIL | The System Controller detects a fan not at speed. An alarm is sent to the CPU, five seconds later the System Controller initiates the power-off sequence (rackmount systems only).
BLOWER B RPM FAIL | Same as above (rackmount systems only).
BLOWER RPM FAILURE | Same as above (deskside systems only).
TEMP SENSOR FAILURE | The System Controller detects a temperature sensor with a reading so far out of range that the sensor is assumed to have failed. The condition i s logged but no power-off sequence is initiated.
FP BUTTON STUCK | The System Controller detects a status panel button stuck in the depressed position. After a 30-second wait, the power-off sequence is initiated (the depressed button interferes with the System Controller's normal monitoring operation.

Table C-3. System Events - Informative

Error Message | Error Meaning
--- | ---
SYSTEM ON | The System Controller reports the power-on sequence completed
SYSTEM OFF | The System Controller reports the power-off sequence completed
SYSTEM RESET | The System Controller generates a backplane reset, due to menu selection or serial port request.
NMI | The System Controller generates a backplane NMI, due to menu selection.
SCLR DETECTED | The System Controller detects a backplane reset, then initiates the bootmaster arbitration process.
BOOT ERROR | System Controller bootmaster arbitration could not find any host CPU responding on the serial bus. The System Controller is not able to communication with the host CPU. The host CPU may not be running or may continue to boot normally.
INVALID CPU COMMAND | The System Controller detects bad command syntax from the host CPU on the Serial Bus. The command is ignored.

Table C-4. Internal System Controller Error Messages

Error Message | Error Meaning
--- | ---
BAD ALARM TYPE | The firmware attempted to send an invalid alarm to the CPU.
BAD MSG: CPU PROCESS | The CPU or System Controller process received an invalid message.
BAD MSG: DISPLAY | The display process received an invalid message.
BAD MSG: POK CHK | The power ok check process received an invalid message.
BAD MSG: SEQUENCER | The sequencer process received an invalid message.
BAD MSG: SYS MON | The system monitor process received an invalid message.
BAD WARNING/ALARM | The routine that decodes alarm and warning messages detected an invalid message.
BAD WARNING TYPE | The firmware attempted to send an invalid warning to the CPU.
COP FAILURE | The Computer Operating Properly (COP) timer exceeded time limits. The System Controller firmware must write to a COP timer port before it times out. If the firmware exceeds the time allowed between writes to a COP port, an interrupt is generated. The System Controller firmware may have entered an endless loop.
COP MONITOR FAILURE | A Computer Operating Properly (COP) clock monitor failure was detected. The System Controller clock oscillator is operating at less than 10 KHz.
DEBUG SWITCH ERROR | The System Controller detected data corruption in the nonvolatile RAM debug switch location.
FP CONTROLLER FAULT | An error was detected in the front panel LCD screen control process.
FP READ FAULT | A read of the front panel status register did not complete successfully.
FREE MSG NODE ERROR | The free message node queue overflowed.
FREE TCB NODE ERROR | The free timer control block queue overflowed.
ILLEGAL OPCODE TRAP | The System Controller's microprocessor tried to execute an illegal instruction, probably because of a stack overrun followed by a process switch.
PULSE ACCU INPUT | An interrupt was detected on the pulse accumulator input port. The port is not used and an interrupt is treated as an error.
PULSE ACCU OVERFLOW | The pulse accumulator overflow port received an interrupt. This port is unused and the interrupt is treated as an error.
SPI TRANSFER | An interrupt was detected on the synchronous serial peripheral interface. This interface is not supported and the interrupt is treated as an error.
STACK FAULT PID 0–6 | One of the seven stack areas used by a System Controller process overflowed its assigned boundaries.
TEMP SENSOR FAILURE | The System Controller detected an invalid measurement from the temperature sensor.
TIMER IN COMP 1 | The timer input compare port received an interrupt. The port is not used and the interrupt is treated as an error.
TIMER OUT COMP 1–5 | One of the five timer output compare ports received an interrupt. The port is not supported and the interrupt is treated as an error.
XMITTER 1 TIMEOUT | The System Controller's 1st UART experienced a failure.
XMITTER 2 TIMEOUT | The System Controller's 2nd UART experienced a failure.

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Appendix B. Maintaining Drives |  | Appendix D. Challenge IO4 PROM, Mezzanine, and Troubleshooting