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Example 9 - Restoring values from memory

Task:​

A connected device temporarily sends 0 km instead of the last mileage during the boot process. This deviation should not be recorded in the measurement data.

Solution:​

$'CALC.ZSG_KM_STAND' = dLatch($'MVB.ZSG_KM_STAND' < 100.0, $'MVB.ZSG_KM_STAND', {storage:'lastValid_km_stand'});

Functions used:​

Explanation:​

  • dLatch(hold, value) with hold=false allows the value to "pass" and stores it internally – in this case persistently by specifying the storage. As soon as hold=true, the last stored value is passed on. This happens when the connected device is started, as the mileage falls below 100.