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Answer:
You want to make sure you have all the data. You want to separate data from the file to create lookup tables.
One reason to connect to the same file several time is that you want to separate data from from the file to create lookup tables.
What are lookup tables?
"A lookup table is an array of data that maps input values to output values, thereby approximating a mathematical function. Given a set of input values, a lookup operation retrieves the corresponding output values from the table. If the lookup table does not explicitly define the input values, Simulink can estimate an output value using interpolation, extrapolation, or rounding, where: an interpolation is a process for estimating values that lie between known data points."
" An extrapolation is a process for estimating values that lie beyond the range of known data points. A rounding is a process for approximating a value by altering its digits according to a known rule. A lookup table block uses an array of data to map input values to output values, approximating a mathematical function. Given input values, Simulink performs a “lookup” operation to retrieve the corresponding output values from the table. If the lookup table does not define the input values, the block estimates the output values based on nearby table values."
What is data?
"Data are individual facts, statistics, or items of information, often numeric. In a more technical sense, data are a set of values of qualitative or quantitative variables about one or more persons or objects, while a datum is a single value of a single variable."
To learn more about data here
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