EPD/HB/40521/000
ISSUE 5
EPD TECHNICAL HANDBOOK Page 58
3. Detectors State. This is the current state of the EPD’s operating mode, i.e.
ON or OFF.
Alarms
The EPD retains a record defining which of the following alarms has occurred. The
record is normally cleared by system software at the start of an issue period:
1. 3 Dose Alarm Flags As section 4.6.8
2. 3 Dose Rate Alarm Flags. As section 4.6.8
3. Return For Read. The EPD clock has exceed the Return For
Read time.
Faults
The EPD retains a record of the following faults flags:
1. Event Logged. An event (possibly but not necessarily a fault)
has been logged in the EPD’s event store.
2. Connection Failed. Communication with the EPD failed.
3. Cal Factors Bad. The EPD calibration factors failed a CRC
check and cannot be recovered from secure
store.
4. EEPROM Fail. An un-recoverable EPD secure store failure
occurred.
5. Bad Sectors. The number of bad EPD secure store sectors.
There is a maximum of nine spare sectors.
6. Detector Test Fail. The EPD detector test was run and the number
of counts received were less than required to
pass the test.
7. Detector Threshold Fail. The EPD detector thresholds failed to load
successfully
8. Radio Fail. Reserved for future use.
9. Other Fault. A fault occurred causing the EPD to reset.
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