BECKHOFF BK3xx0 - Manual (Page 50)

Notes on the Documentation
48 Fieldbus Components
Default assignment of the inputs and outputs to the process image
Once it has been switched on, the Bus Coupler finds out how many Bus Terminals are inserted, and creates an
assignment list. The analog and digital channels, divided into inputs and outputs, are assembled into separate parts
of this list. The assignment starts on the left next to the Bus Coupler. The software in the Bus Coupler collects
consecutively the individual entries for each of the channels in order to create the assignment list counting from left to
right. Four groups are distinguished in the assignment:
Group Functional type of the channel Assignment
1 analog outputs byte-wise
2 digital outputs bit-wise
3 analog inputs byte-wise
4 digital inputs bit-wise
All complex Bus Terminals are represented by analog inputs or outputs.
Overview of the distribution of the process image within the Bus Coupler
Output data in the Bus Coupler
Input data in the Bus Coupler