Solution
However it is not possible to run at 1 MHz Rate Primary Control Loop of VeriStand Engine there is a possibility of achieving 1MHz or even more rate of simulation models in HIL systems. FPGA can be used in order to simulate processes with 1 MHz or even higher rate.
VeriStand custom device could load a developed FPGA bitfile and make inputs and outputs available for configuration and execution in VeriStand Engine. Note that a developing custom device for VeriStand is an advanced topic and requires a deep knowledge of Real-Time, FPGA systems and VeriStand Engine.
NI Engine Simulation Toolkit for NI VeriStand is the example of implementing simulation model on FPGA.