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Open Systems and Standards ... approaches to interoperability. Mike DeNamur Product Manager, Interoperable Systems. Building Automation Systems Division. Customer Issues. Incorporate new technology faster. Reduce operating costs - energy - manpower - maintenance. “Open”.
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Open Systems and Standards ... approaches to interoperability Mike DeNamur Product Manager, Interoperable Systems Building Automation Systems Division
Customer Issues Incorporate new technology faster Reduce operating costs - energy - manpower - maintenance “Open” Integrate more of my buildings control systems Help Manage Information Easy to reconfigure Comfortable and safe environment Save Energy Consolidate Operators Stations Single responsibility Freedom to select vendor and products Competitive bids Cost effective
Why is Interoperability an Issue? • Microelectronic control technology has given birth to the issue • Manufacturers have given owners good cause to require a “trump card”
Customers’ Desire Flexibility to choose the best products, the best application knowledge and the best service from a variety of suppliers to meet their evolving building control needs . . . in a cost effective manner
Definitions Interface Ability for products not originally designed to work together, to share information. InteroperateDigital communications between products designed independently to the same communication standard. InterchangeAbility for multiple vendors' products to functionally replace each other on the same communication network
Delivering Solutions Interface Interoperate Interchange Yesterday’s Solutions
PC-2 Building Controller Integrator Unit Controller
Delivering Solutions Today’s interface strategies will evolve to embrace open, standard systems over time as products become available. The best way to meet customer requirements is to provide true, open standard building management products and solutions.
Delivering Solutions Interface Interoperate Interchange Yesterday’s Solutions Today’s Solutions
System Controller LAN HVAC 1 HVAC 2 LIGHTS FIRE ACCESS Unit Controller LAN
Delivering Solutions Interface Interoperate Interchange Yesterday’s Solutions Today’s Solutions Tomorrow’s Expectations
LONMARK System Architecture System Controller LAN HVAC 1 LIGHTS FIRE HVAC 2 ACCESS Unit Controller LAN
Enabling Technologies • Not BACnet vs. LonMark! • Both will be needed and used to deliver solutions to interoperability for our industry
Sponsored by ASHRAE • Developed with input from a cross section of the industry • Adopted as ASHRAE / ANSI Standard 135 • BACnet standard defines common objects, properties and application services. • Active committee with “to do” list including ... • Conformance test • Additional standard objects • Define better methods of specification
BACnet Objects Analog Input Analog Output Analog Value Binary Input Binary Output Binary Value Calendar Command Device Event Enrollment File Group Loop Multi-State Input Multi-State Output Notification Class Program Schedule
LonTalk protocol offered by Echelon Corporation as technical solution • Packaged on chip called Neuron • Shaped by LonMark Association to insure interoperability • LonMark Standard Network Variable Types (SNVTs) and Profiles define standard uses of protocol • Work underway to recognize LonMark as international standard.
Enabling Technologies • Not BACnet vs. LonMark! • Both will be needed and used to deliver solutions to interoperability for our industry • BACnet for building system interoperability • LonMark for unit controller interoperability
System Controller LAN / BACnet HVAC 1 HVAC 2 LIGHTS FIRE ACCESS Unit Controller LAN / LonMark
Open System Interconnection Model Basic OSI Reference Model Application Layer Presentation Layer Session Layer Transport Layer Network Layer Data Link Layer Physical Layer
BACnet Protocol Stacks Application Network Data Link Physical BACnet Applications Layer BACnet Network Layer Lon Talk MS/TP Ethernet PTP ARCNET EIA-485 EIA-232
Specifying Interoperability • Evaluate why to specify interoperability • Not as simple as “... shall be BACnet compatible” • Specify protocol and acceptable physical media “... standard BACnet objects over ARCNET or Ethernet LAN” • Clearly define interoperable points • add “interoperable” column to point list • Specify functionality of interoperable data “... display on graphics for status and control”
Interoperable Point List CH-1 Analog Binary Point Name Input Output Input Output Alarm BACnet Point Lvg Water Temp Temp Setpt Low Limit AI, AO Evap Refrig Temp Temp Low Limit AI Evap Refrig Press Pressure High Limit AI Cond Refrig Temp Temp Low Limit AI Cond Refrig Press Pressure High Limit AI Demand Limit %RLA Setpt High Limit AI, AO Unit Status On/Off On/Off BI, BO
Trane’s Commitment • 1993 press release in support of BACnet • Early adopter of BACnet • Native BACnet application • Coincident with Tracer Summit product development • Participation in SSPC-135, GPC-13, BACnet Interoperability Consortium and LonMark Association
Trane’s Approach • Interoperability via standard protocols • System level interoperability • facilitates competitive bidding of BAS • convenient method of assigning responsibility for proper system control and maintenance • provides interoperability for legacy systems
Trane’s Approach • Unit level interoperability presents opportunities, but requires more sophistication • commissioning, longterm maintenance issues • requires system integrator with tools and knowledge to make components function as systems • offers less firewalls than system level interoperability
Interoperable Products • Tracer Summit BACnet implementation • Building Control Unit (BCU) • Native BACnet device • Supports both ARCNET and RS-232 BACnet • Also provides gateway to legacy unit controllers • PC Workstation • Native BACnet device • ARCNET and RS-232 BACnet
Interoperable Products • Tracer Summit BACnet functionality • Status, control, alarm mgmt, scheduling • Continuing to evaluate the possibilities presented by LonMark
CenTraVac Rooftop DDC-VAV Chiller Unit or Fan Coils Tracer Summit Architecture Programmable Control Module Air Cooled Series R Chiller Universal PCM Voyager Micro Rooftop Lighting Control Generic I/O or Thermostat Intellipak TCI PCM UCM LCP UPCM RTA-RTW PCM Scroll UCM CSC CSAH UCP UCM UCM UCM UCM Climate Changer AHU Commercial Self Contained 20-60 Ton Scroll Chillers VariTrac Dampers