Select PlantStruxure reference architectures? - Schneider Electric ...

5 – Func. unit ref. archi.Modicon STB is recommended where there is small I/O density and no advanced functions arerequired. Otherwise the remote I/O drops are preferred.This functional unit reference architecture can be used in food and beverage, water, mining,mineral and metal, electrical energy, or oil and gas applications that require a flexible solutionwith high performance. This architecture can also be proposed for a high dependability iPMCCsolution.For critical applications where PAC redundancy is required, the high service functional unit canoffer hot standby capabilities providing a highly available solution. Quantum hot standby is thepreferred solution, even if a Premium PAC can also be proposed in some applications.The following figure presents a hot standby architecture – in this case a Premium hot standby isproposed.Figure 29: Example of Redundant High service reference architecture© 2012 Schneider Electric All Rights Reserved50