The I/O modules can be classified into various types such as discrete, analog and special modules, and can be installed on rails or racks with multiple slots [1]. Meanwhile, Intel Xeon 6+ also includes up to 2 I/O modules with Intel 7 process technology [5].
These modules can be installed on rails or racks with multiple slots, with each module inserted into one of the slots. The number of slots ranges from 4, 8 to 12 [1]. In industrial control, to enable PLC to process analog quantities, an AD module is required to achieve the conversion between analog and digital quantities.