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How to fix "? ? ?" display error in Simulink Model

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Raymond Le
Raymond Le 2011-4-16
I created a model with Z^-1 blocks, all blocks display in [z^-1] fine, however, after I built a subsystem with these blocks or copied them to another model, all Z^-1 blocks became ? ? ? instead of [z^-1]?
  2 个评论
Kaustubha Govind
Kaustubha Govind 2011-4-17
I'm assuming that you mean the "Integer Delay" block - what do you enter as "Number of delays"?
Raymond Le
Raymond Le 2011-4-18
the delay bock only -1 for each [Z^-1]

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回答（1 个）

Arnaud Miege
Arnaud Miege 2011-4-18
The number of delays must be positive, you can't have a number of de lays equal to -1. Change it to a positive number. If I misunderstood your question and subsequent comment, please clarify what you mean.
HTH,
Arnaud

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