Hello.
Thank you for posting to the NI Discussion Forums.
The information that you are requesting can be found in the user's manuals for the devices that you specify. Please refer to the following links for information on what the resistance and voltage specifications are for the 6110 and the 6115.
6110 specifications
6115 user's manual
For the 6115, please navigate to Appendix A for detailed specifications for the device.
Let us know if you find everything that you are looking for!
Brian F
Applications Engineer
National Instruments