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3.4 MPU6 FAULT CODES
3.4.1 Alarm Messages
When an alarm occurs during normal operation an error message is shown on the integrated
LCD display of the MPU6.
The message generally comprises of three parts, which are displayed in succession.
The display shows the alarm number, e.g. ALARM 54 – 11 CPU BUS ERROR
The first two digits are the BACTA industry alarm code. The second two digits are the
Barcrest Group alarm code. The third part is a brief description of the fault encountered.
3.4.2 Class of alarm
The various alarms, which can occur on the MPU6 system, are grouped into 15 classes.
When a fault occurs, the first digit of the Barcrest Group alarm number shows the class of
alarm
A complete list of alarm messages, related to the associated BACTA and Barcrest Group
fault code numbers are shown in the following sections.
3.4.3 Class 1 alarms
Known as processor exceptions, these are errors detected by the CPU. They can be caused
by hardware faults in components on the CPU bus, e.g. CPU, RAM, UART etc.
When shown on the display these alarms range from 11 – 1F with Bacta code 54
Bacta. Code Barcrest
Group No.
Message
54 11 CPU ACCESS ERROR
54 11 CPU BUS INTERRUPT
54 12 ADDRESS ERROR
54 13 ILLEGAL INSTRUCT
54 14 DIVIDE BY 0
54 15 BOUNDS CHECK
54 16 OVERFLOW TRAP
54 17 BAD INTERRUPT
54 18 UNUSED TRAP
54 19 BAD STACK FORMAT
54 1A UNINIT IVECTOR
54 1B PRIV VIOLATION
54 1C TRACE EXCEPTION
54 1D BREAKPOINT
54 1E RESERVED VECTOR
54 1F WATCH DOG RESET
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