I was wondering what does the this mean that is on all the modules some of them have different numbers like X-6-7-8 instead. Ill make an illustraion below here how it looks like with my skills in notepad ;D
It stands for the hardware version of the component, marked with an X.
In your case, the hardware version is 3.0
Be aware-> you have a firmware version, which is basically the software which the component uses (new firmware versions can be downloaded). And you have a hardware version, defining the hardware.
search on automation.siemens.com in the product/support catagory..
If you fill in the MLFB number (starting with 6ES7 i.e: 6ES7416-3XR05-0AB0) you can find the product and all the releases+updates about that product...
Also can see what has changed in a newer version..
take some time for it