ETAS MDA V8 - Operations of type Limit Monitoring; Behavior of Calculated Signals Depending on the Status Flag

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10.1.5 Operations of type "Limit Monitoring"
MDA V7 allows to define calculated signals which monitor if one or more signals
exceed a predefined value. For each limit to monitor, a condition is defined,
together with a message to be shown if the limit is not met.
For MDA V8 such an operation is migrated into a calculated signal of type
Boolean. The associated message will not be migrated.
Example:
The XDA file for a signal contains three calculation rules:
1 MyLimitMonitor1?1 = ${'C:_Data\INCA-NG_Sample Files\
Coldstart2.dat:DG0:CG0:N10'}>1000
2 MyLimitMonitor1?2 = ${'C:_Data\INCA-NG_Sample Files\Cold-
start2.dat:DG0:CG0:N10'}<100
3 MyLimitMonitor = ${'MyLimitMonitor1?1'} + ${'MyLimitMonitor1?2'}
These formulas are converted into one calculated signal in MDA V8:
Name MyLimitMonitor
Formula (N10 > 1000) || (N10 < 100)
Type Booelan
10.2 Behavior of Calculated Signals Depending on the Status
Flag
In an MDF measure file, for sample additionally two flags are available: One for
indication whether a value is available at a certain timestamp, and another which
indicates whether a recorded value is valid or not.
Each of the flags can be True or False, therefore the following four combinations
are possible:
Has a
value
Value is
valid
Description Example
TRUE TRUE Regular sample
FALSE TRUE No sample at this
point
Timestamps before the first sample of
the signal is available
TRUE FALSE Error sample with
value
FALSE FALSE Error sample with
no value
Integer division by 0
MDA V8 | User Guide