HiTopological Address Difference in Ecostruxure

[Mehdi_Sajjadi]

Hi 

I am novice in Ecostruxure Control Expert and while adding I/O modules to configuration, it asks me about "Topological Address". There are 2 options to choose : 

I/O data type : Topological

I/O data type : Device DDT

Can anyone help me about these 2 to options and what is their difference ?

Thanks

[Trinxs1]

Modicon M580 has moved towards tag based addressing rather than a specific address.  In some cases where we consider legacy migrations we may choose to use an address based system.  

By default all IO modules will generate a device data structure (Device DDT) which provides health status and actual values such as input value or an output value depending on the module.  For an addressed based option (topological) a digital input channel would be expressed as %I<rack>.<slot>.<channel>  e.g. if it was the first input on an input card which is in the CPU rack (rack 0) and in the third slot (i.e. slot 2,  0 being the first slot) the address of the input would be %I0.2.0.  Alternatively the last output on a 4 channel analogue output card in the fourth rack and 8th slot is %QW3.7.3.

Generally go for the device derived data structure as the default.