Can you help me answer these questions. Advantages and Disadvantages that you identify in the use of global variables. Advantages and Disadvantages that you identify in the use of labels. Personal opinion comment on your preference, if you had to choose between using Labels or using Global Variables. Explain.
Thanks,
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Let me put it in my own words. It's not a complete answer.
LABELS are used to attach information specific to an object (flowitem, taskexecuter, processor, queue, etc) and that is mostly used by that object or at that object.
For example, you can put process times on labels on flowitems so that when that flowitem reaches a specific processor, the processor reads the labels and knows which process time to use.
Information on labels tend to be used at the "place" where they are placed. But nothing prevents you from referencing a label from anywhere in the model.
GLOBAL VARIABLES are typically used when an information needs to be accessed or updated from anywhere in the model. I rarely use these but I would if I need a variable which is based on many different informations and conditions in many places in the model.
For example, the production line is either "on" or "off" and that is based on many things happening all over the line and all these things can set a Global Variable called "LineStatus" to on or off.
A few more items:
- You can have hundreds of labels in your models but you would typically have only a few Global Variables.
- Info goes in a Global Variables when it doesn't make sense to put it in a Label on a Table.
- Not sure about this one but I think information on Labels is faster to address than on Global Variables.
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