Diagnostic, Security, and Integrity Checks
WBPEEUI240774A0 2 - 9
through a square root, polynomial, or other function block fol-
lowed by a scaling function to provide the value in engineering
units.
Automatic Calibration
Compensation for drift of input channel circuitry is done by
periodic automatic calibration of each A/D converter using an
internal precision low-drift reference. This function is trans-
parent to normal input channel processing.
Field Calibration
Field calibration is not necessary in normal situations. It is
possible to perform calibration procedures in the field if ultra
stable, known, precision references are available. Field calibra-
tion data is stored in nonvolatile memory. The complete field
calibration procedure is in Section 4.
Factory calibration data is stored in a unique nonvolatile mem-
ory area. If field calibration does not provide the desired
results, the factory calibration data can be restored.
Using FC 217 to change the gain or offset values per channel
and type, it can compensate for differences in input signal
readings. Tuning these parameters can take the place of a field
calibration. Refer to FC 217, specification S1.
Diagnostic, Security, and Integrity Checks
The IMASI23 module performs built-in tests during power-up
and on reset to check the operation and integrity of the mod-
ule.
Diagnostics in Diagnostic Mode
The ASI module performs built-in tests in diagnostic mode to
check module operation. These tests include:
• A/D internal reference checks.
• Switch test.
• Watchdog timer test.
• CPU test.
• Timer test.
• ROM test.
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