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Diagnostic and error messages
Video Recorder – User Manual 251
9. Diagnostic and error messages
9.1 Diagnostic Messages
The instrument executes diagnostic routines during instrument start-up and during maintenance
procedures such as calibration. It also monitors online operation for both process faults and instrument
errors.
Error messages
Table 9-1shows messages that may appear on the instrument displays if a diagnostic condition is
detected, along with the action you should take.
Table 9-1 Diagnostic Error Messages
Message Description User action
INPUT FAILURE The analog input is either open/shorted Check input devices for open or short.
The analog input has been exposed to
electromagnetic noise.
See Section 2 for proper wiring
techniques.
The analog input is out of range Choose a higher range.
FLOAT PT ERROR
A floating point calculation error has occurred.
(divide by zero, underflow, overflow).
Check Free Form Math and Math CV
inputs for division by 0. Also check for
input values producing an underflow or
overflow error (that is, calculation is not
between -1x10
-38
and -3x10
38
or is not
between 1x10
-38
and 3x10
38
).
CHECKSUM
ERROR
An error was detected in the database of one
or more function blocks. The affected
function blocks are reset to their defaults.
Inspect entire instrument configuration
and reconfigure as needed.
ATTENTION
Be advised that the INPUT FAILURE diagnostic will continue to be displayed even after its cause has
disappeared. After verifying that this diagnostic’s cause has been corrected, you may clear the INPUT
FAILURE message from all ON LINE screens by performing one of the following sequences of steps.
1) Acknowledge the INPUT FAILURE diagnostic.
From the ON LINE main menu, select ACCESS SUMMARIES. Select DISPLAY DIAGNOSTICS. Use the
<Up> and <Down> buttons to highlight the INPUT FAILURE diagnostic(s) that you wish to acknowledge and
then press <Enter>. Once the diagnostic has been acknowledged, it will still be listed in the DISPLAY
DIAGNOSTICS screen but will no longer be displayed on any ON LINE screen.
2) Delete the INPUT FAILURE diagnostic.
From the ON LINE main menu, select ACCESS SUMMARIES. Select DELETE ALL DIAGNOSTICS. Once
this menu choice has been executed, all diagnostic messages will be deleted from the DISPLAY
DIAGNOSTICS screen and will no longer be displayed on any ON LINE screen.
During power-up, if an analog input is open or is out of range, the setpoint and process variable values
will display OFF and the loop's AUTO mode is disabled. Check connections to determine problem.
During calibration if the input reference voltages supplied by the technician are outside acceptable limits
a "CALIB FAIL" message will be generated.