Product Description
These smart I/O modules also have on-card on-line fault detection and automatic
calibration/compensation. Each input channel has its own precision voltage
reference. Once per minute, while not reading inputs, the on-board
microcontroller reads this reference. The microcontroller then uses this data read
from the voltage reference for both fault detection and automatic temperature
compensation/calibration.
Limits have been set for the expected readings when the on-board
microcontroller reads each voltage reference. If the reading obtained is outside
these limits, the system determines that the input channel, A/D converter, or the
channel's precision-voltage reference is not functioning properly. If this happens,
the microcontroller flags that channel as having a fault condition. The CPU will
then take whatever action the application engineer has provided for in the
application program.
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