TIA Portal V13 - FB's. DB's, UDT's?
- Thread starter russg
- Start date
The difference between using UDTs with FCs and FBs is that with FCs you will link the UDT data to the FC via one or more global DBs, whereas with an FB you can also let the data be part of the instance of each FB call.
The memory usage will not be much different no matter if you go Global DB and FC or you go Instance DBs and FB.
Besides, memory is proactically abundant these days. It is not such a concern as it used to be.
The memory usage will not be much different no matter if you go Global DB and FC or you go Instance DBs and FB.
Besides, memory is proactically abundant these days. It is not such a concern as it used to be.
Thanks Jesper.
Is it easier to create Win CC faceplates if you have made a UDT rather than just an FB and a DB?
I'm thinking the best way is to create a UDT for say a valve FB, then create a global DB that has all the valve data in for all valves. This would be preferred than many DB's, although I understand that the memory worry is not much to worry about, this would make the program less messy as it grows.
I dont use faceplates, so I cannot say if it is easier to work with UDTs for faceplates.
However, it is generally better to use a global DB than an instance-DB for data that has to be accessed outside the FB or FC. So I would use a global DB and UDTs for the data that has to be accessed from the HMI. All other data (that isnt to be acessed by the HMI or from other blocks outside the FB) can better be packed inside the FBs instance. In that way if you need to you can change the declaration part of the FB without it affecting the HMI.
However, it is generally better to use a global DB than an instance-DB for data that has to be accessed outside the FB or FC. So I would use a global DB and UDTs for the data that has to be accessed from the HMI. All other data (that isnt to be acessed by the HMI or from other blocks outside the FB) can better be packed inside the FBs instance. In that way if you need to you can change the declaration part of the FB without it affecting the HMI.
Great thanks Jesper
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