Data Handling Software Safety Features - SIMS Deltec CADD-Legacy PLUS Operator's Manual

Section 5: Reference
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switches for and . The software must detect that both
switches are activated before taking any action.

Data Handling Software Safety Features

Data Stored in RAM
Before use, data associated with delivery and stored in RAM is
tested by calculating a CRC on the data and then comparing it with
the CRC stored with the data. If the stored and calculated CRCs do
not match, the software will display a system fault screen, turn on a
continuous two-tone audible alarm, and stop all drug delivery.
Data Stored in EEPROM
Before use, data associated with delivery and stored in EEPROM is
tested by calculating a CRC on the data and then comparing it with
the CRC stored with the data. If the stored and calculated CRCs do
not match, the software will display a system fault screen, turn on a
continuous two-tone audible alarm, and stop all drug delivery.
Data Stored in NOVRAM
Before use, data associated with delivery and stored in NOVRAM is
tested by calculating a CRC on the data and then comparing it with
the CRC stored with the data. If the stored and calculated CRCs do
not match, the software will display a system fault screen, turn on a
continuous two-tone audible alarm, and stop all drug delivery.
Data Used in Calculations
Calculations on data used in some way to control the delivery of
drug are performed redundantly.
The two calculated values are then compared. If the two values do
not match, the software will display a system fault screen, turn on a
continuous two-tone audible alarm, and stop all drug delivery.
Timer Data Registers
The data in the Real Time Clock is checked at regular intervals. If
the data is not reasonable, the software will turn on a continuous
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