My question was not related to SCXI as we have no SCXI frontend. As mentioned in my post we use a DAQPad-6259 with screw terminals. The torque sensor has 6 connections :
Vex+/- will be connected to an external supply or the DAQPad +5V terminals. The question is now if the "Custom Voltage with Excitation" setting in the DAQ assistant can be used to measure Vex-sense and Vsig in on turn and let the DAQ function do the excitation-compensation (without SCXI modules).
Of coarse I can measure thes two voltages myself and do the compensation in my software. But maybe this is already builtin into the DAQ Assistant.