Micro820 +DC10 on I/O

This is probably a very simple question but I'm new enough that I'm struggling with it. On the Micro820 platform, there's a terminal on the input block that's labeled +DC10. Is that merely an internal power supply that supplies +10vdc when connected to ground? Does it serve any specific purpose?

Note: I have not used this controller but from the manual, see pdf

Okay great - that's what I was thinking. And it looks like if I had just kept reading, I would have found that page (I was in the UM005 document when I submitted this thread). Thanks so much!