Question about differences between the modules regarding safety

Hello,

I have a quick question regarding the different expansion and master modules for a project i am working on. I want to implement the newer modules with new software on a mobile hydraulic machine but i am getting a bit confused with the safety differences between the modules.

I am currently in the planning phase of looking what modules i am going to use and how to implement the software the most efficient way. I am planning to use a new MD-5 with MC or XC expansion modules. But seeing as there is a MC43FS version which is rated for safety it not totally clear to me what the safety functions are that that module provides over a non FS version?

In the manuals and datasheets i was able to find is that it does real time checks and has redundancy on the in and output which is nice. But that got me wondering if the XC modules have that self check as well? for example if one output from the XC modules gets broken or disconnect from the valves does that also show that the output is not connected or broken or? Because that would make error detection and tracing way easier in the future of the project

If someone could help me a bit with these questions that would be great!

Thanks in advance,

Nick