HVAC Control in the New Millennium.pdf - HVAC.Amickracing

Energy and Power Management, Distributed Control Trendslow-cost communications and networking capabilities of PCs. PLCs mayserve as machine controls and as front-end I/O processors for devicelevelnetworks. Traditional DCS will give way to field-based intelligent I/O systems. The older centralized, hierarchical control architectures willfade because the software requirements of central command and controlsystems are becoming burdensome and practically unmanageable.Complex Adaptive SystemsThere will be a transition from traditional procedural controls torule-based, hostless peer-to-peer controls systems (Figure 2-5). Wheneach input or output point becomes intelligent and connected, controlwill be handled locally through intelligent peer-to-peer communicationsamong the sensors and actuators, without intervention from an externalhost processor.Figure 2-5. Architecture for complex adaptive systems, with I/O andintelligent peer-to-peer communications for true distributed control.©2001 by The Fairmont Press, Inc. All rights reserved.