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8.3 Function block FB
8.3.1 Introduction of Function Block FB
The Function Block are an applications/programs or a part of the applications/programs and
they can be called when and all the times that you need.
To use the FB means that:
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it is not necessary to write a lot of time the same program
•
it is possible to debug the single FB
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you can create and save for yourself a personal library
•
you can use a lot of FB made by ISaGRAF, Dixell or third party
•
the debug of the whole program is more quickly (save time and money)
Here below you can see some typical FB made by ISaGRAF and Dixell:
The FB is composed by some Inputs (on the left side) and some Outputs (on the right side).
When you use the FB in your program is enough to send them only the value of the
variables to get the result; it is not necessary to know what happen inside the blocks.
Another important characteristic of the FB are:
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the FB can be visible and modifiable
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the FB can be visible and modifiable with password
•
the FB is protected (non visible and not modifiable)
FB made by ISaGRAF
FB made by Dixell
