BECKHOFF BC3100 - Manual (Page 27)

PROFIBUS-DP basics
BC3100 27
When a box in the "Order no." column is double clicked, a menu appears
for selection of the required identifier for the correspondingly plugged in
terminals or data lengths of the PLC process image.
Various possibilities of assigning process data are available in the case of
the BC3100. The various assignment possibilities are explained in detail in
the next chapter (Profibus bus terminal controller BC3100). In the
appendix, you will also find an example in relation to the possible settings.