The right answer is “it depends on the application and what’s already installed”. An optimized solution will probably use more than one fieldbus type. For example, new ‘analog’ installations benefit greatly from FOUNDATION Fieldbus, while new ‘discrete’ installations can benefit from PROFIBUS, PROFINET, DeviceNet, and Ethernet/IP. Electrical Integration depends on the equipment supported protocol, but IEC 61850, Ethernet/IP and PROFIBUS could all prove useful. The most common view is to look at the current installed base, whether HART, PROFIBUS, DeviceNet, MODBUS, or others. Why replace when you can integrate?