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12 Maintenance Menu and Error Handling
D03283R01.10 TESLA LITE User Manual 12-5
12.2 Error Handling
The recorder has hardware and software self-check capabilities that work to
keep it operational and provide an indication if a failure occurs.
Failure Contact
Output Contact #7 on the rear panel is a normally open contact that closes to
indicate a problem with the device. The contact is controlled by a hardware
watchdog circuit, ensuring a failure is reported even if the unit’s processors are
not functional. The state of the Failure Contract is mirrored by the front panel
Recorder Functional LED.
Failure
Handling
Supervisory software continually checks all system processes. If a failure is de-
tected an attempt is made to correct the problem through a software restart. A
software restart takes place quickly and does not activate any external indica-
tors.
If the failure persists, the unit will initiate a hardware reset to attempt to clear
the problem. A hardware reset takes approximately a minute and half to com-
plete. If the problem is not cleared after four consecutive reset attempts, the
unit enters the Persistent Error state. In this state, the recorder activates its fail-
ure indicators and stops initiating resets to avoid interfering with any diagnos-
tic investigation.
If the Supervisory software subsequently determines that the problem has been
cleared, it automatically returns the unit to its normal operating state, clearing
the failure indicators.
Figure 12.2: Error Handling
Normal
Operation
Software
Restart
Hardware
Reset
Persistent
Error Mode
First Detected Error
Problem Cleared
Problem Still Present
Problem Persists After
Repeated Reset Attempts
Problem Cleared
Problem Cleared