What is the term used to describe how hardware input/output connections correlate to PLC program functions?

The term that refers to the correlation between hardware input/output connections and PLC program functions is addressing system. This concept involves assigning specific addresses to each of the input and output connections of the programmable logic controller (PLC), allowing the PLC to identify and differentiate these signals in its programming environment. By using an addressing system, each input or output can be clearly referenced within the program, facilitating effective communication between the physical hardware and the software logic. This is essential for ensuring that the PLC operates correctly based on its programming and can execute tasks based on real-time input data.

In the context of the other options, data mapping typically refers to the process of translating data from one format or system to another, which is broader than just the input/output connections of a PLC. Connection layout might suggest how devices are physically wired together, but it does not encompass the programming aspect. Module configuration pertains more to setting up the parameters and properties of individual modules within a system rather than their interaction with the PLC program itself.