output module plc and core have to do with the thread

Logical processor is threaded, is called a logical processor should he processor is not complete, as you can understand the basic structure of the execution unit of the processor.
Dual-core 4 thread is hyperthreading, his plc analog input output module  understanding is not dual-core simulation into four core, he is to be a core integrated two logical processors that two execution units. So that he can be like four-core processors in addition to four-threaded task, overwhelmingly in support of multi-core tasks are to support Hyper-Threading, but the dual-core 4 thread is always a dual-core processor.
Here to explain the core is there a more complex combination consisting of multiple parts, he does not just consist of the plc soe module  processing unit, the core processing unit contains something + L1, L2 + + instruction processing unit clock generator and so on. Hyper-Threading is to integrate the two core execution units.
Also you say FX6100 is a 6 core 6 threads, the plc manufacturer  current AMD processors do not use hyperthreading.