Measuring range monitoring (0x382199, 0x302199)

Three Status bits signal whether the current measured value of an analog input lies outside of the measuring range.

"Underrange" / "Overrange" (Index 0x60A0:01 / 02)
If the "Underrange" / "Overrange" status bit is set, the following applies:

• The current measured value is outside the nominal measuring range.
• The measuring error specified in the technical data is not guaranteed for measured values outside the nominal measuring range.
• If "Legacy Range" is set:
• The current value of the "Value" variable does not correspond to the measured value.
  The current measured value is larger / smaller than the largest / smallest displayable value in the "Legacy range".
• The error threshold settings via 0x80AD:17 / 18 are ignored. If the "Error AI" LED lights up, the error bit is set.

"Error" (Index 0x60A0:07)
If the status bit "Error" is set, the following applies:

• The current measured value is smaller than the lower error threshold or larger than the upper error threshold.
  (In the factory setting, corresponds to the monitoring of the "Extended Range" technical measuring range see Error thresholds)
• The "Error AI" LED lights up red. It is linked to the status bit "Error".

Error thresholds

The error thresholds can be set in "Extended Range" mode via the indices:

• 0x80AD:17 "Low Range Error",
• 0x80AD:18 "High Range Error".

In the factory setting, the error thresholds lie at the smallest and largest displayable values of the technical measuring range ("Extended range").

Exceeding the error thresholds is signaled by:

• The "Error" status bit is TRUE.
• The "Error AI" status LED lights up red.
• The DiagMessage with the text ID 0x870A "Analog range error" is displayed (see chapter "EL8601-8411 - Diag messages").

Recommendation for setting the error thresholds Adapt the error thresholds to the output signal range of the sensor.