DESCRIPTION AND OPERATION
INPUT CALIBRATION
I-E96-301B
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Automatic Calibration
Compensation for drift of input channel circuitry is done by
periodic automatic calibration of each channel using on-board
precision low-drift references. This function is transparent 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 NVRAM. The complete field calibration
instruction is in
Factory calibration data is stored in a unique NVRAM area. If
field calibration does not provide the desired results, the fac-
tory calibration data can be restored.
Using Function code 217 to change the gain or offset values
per channel and type can compensate for differences in input
signal readings. Tuning these parameters can take the place of
a field calibration. Refer to function code 217 specification 1.
INPUT CALIBRATION
Data from the factory calibration is stored on the slave in non-
volatile memory. No customer calibration is necessary. If field
calibration is desired, use the procedure in
.
SECURITY AND INTEGRITY CHECKS
Diagnostics Run on Reset
The IMASI03 performs built-in tests on power-up and on reset
to check the operation of the module. These tests include:
•
PROM checksum verification.
•
NVRAM checksum verification.
•
DPRAM/SRAM verification.
•
Processor instruction set tests.
•
Timer test.
