New Symphony hardware at present Symphony plus does require altering the programming software?
The answer quickly and without much thought is Yes!. For example, All CLDs (Logic strategy) could be re-compiled and download into the new S+ controller.
But, could you be more specify about the new S+ hardware that you want to integrate. All Harmony Rack I/O be Symphony Plus or Symphony are compatible be accounting the type of the module.
For example, a IMASI23 is the same module SPASI23, The first to letter only mean the technology (Product Marketing, and faceplate color) the following 3 letters mean the Module Type and the 1er numbers is the Hardware revision, and the last number is the firmware revision (functionality). So, you must be sure that the Type letters and the last number been the same.
A DSI02 module functionality is integrate into a DSI22 module.