The PCI-6111 has a built in attenuator to allow up to 42V inputs. In order to read 100 volts you will have to use some sort an external attenuator. National Instruments offers several different modules and terminal blocks in the SCXI form that would accomplish this.
I would recommend reading through this KB for more information.
http://digital.ni.com/public.nsf/websearch/38AEFF122C8D732F8625629800519927?OpenDocument
I hope this helps.
Joshua