Scalexio hardware-in-the-loop (HIL) simulators from dSPACE address changing requirements in HIL projects. A flexible component design enables systems to be built to any configuration and to be used for different test tasks such as hardware configuration and plant modeling. Scalexio systems are planned and modified so different types of electronic control units can be tested with minimum effort on the same system. The software configurability simplifies change implementation and allows specifications and testing to be introduced in late stages of a project. Component test and network systems are built with common hardware components, allowing Scalexio to be sized to fit specific tasks. Hardware modules can be installed in any slot for improved system setup, and all channels are configured graphically, enabling automatic system documentation.