I am part of I&C design of a huge port with more than 350 buildings including pump houses, dock houses, modular substations, gas utility stations etc. we have a dedicated BMS (Building Management System) mainly interacting with DDC (Direct Digital Controllers) for HVAC, in one of the value engineering workshops there was a suggestion to integrate it with SCADA. Unfortunately we are pressed for time for such a big revamp and our System Architecture for SCADA is more or less frozen, however i do not want to use this as sole reason, can there be any other reason(s) which can help me make an argument not to integrate/merge them together (SCADA doing BMS work).?