d SPACE FAQ 733
FAQ 733
Keywords
Min, Max, Saturation
Question
What is the meaning of the Min/Max values I can specify in the TargetLink block dialogs and for
Stateflow data?
Answer
1. Min/Max values for TargetLink blocks:
The Min/Max entries let you specify constraint range limits for an output variable where you know that the limits will never be exceeded. These constraint range limits are taken into account by the Code
Generator when optimizing the code. Do not confuse these Min/Max values of TargetLink blocks with the saturation limits you can specify with the TargetLink Saturation block. The Min/Max values of
TargetLink blocks are not used to generate saturation but to optimize the code using the confirmation you made to the Code Generator.
Typical consequences of misunderstanding the meaning of the Min/Max values of TargetLink blocks:
- A user specifies Min/Max values and expects that a saturation pattern is generated which saturates to the Min/Max values. This is not the case. Instead of a saturation pattern
(which would saturate not to the Min/Max values but to the range of the selected data type), no saturation pattern is generated at all because of the confirmation that the value of the variable will never exceed the Min/Max values.
- A user specifies Min/Max values at block X and places a TargetLink Saturation block Y after X which has saturation limits equal to the Min/Max values of X and expects a saturation pattern to be generated for Y which saturates to the Min/Max values of X. This is not the case. No saturation pattern is generated at all because of the confirmation that the value of X will never exceed its Min/Max values.
- A user specifies Min/Max values at block X, models a plausibility check after X which checks if the output of X is in the range of the Min/Max values of X, and expects code to be generated for the plausibility check. This is not the case. The Code Generator uses the
Min/Max values as a confirmation that X will always be in the range of its Min/Max values and the plausibility check is removed by optimization.
2. Min/Max values for Stateflow data:
The meaning of Min/Max values for an item of Stateflow data differs from the meaning of Min/Max values for a TargetLink block in one point: If a Stateflow data has enabled saturation (properties sf.checkmin and/or sf.checkmax on the block list of the TargetLink Property Manager), the Code
Generator generates saturation to the limits specified by the Stateflow data’s Min and/or Max values, if specified (sf.min and sf.max ). If saturation is activated and no Min or Max value is specified, the Code
Generator generates saturation to the range of the selected data type.
Meaning of Min/Max values
FAQ Version: 3 / 2012-05-22
Page 1

d SPACE FAQ 733
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Meaning of Min/Max values
FAQ Version: 3 / 2012-05-22
Page 2