Introduction to Building Communication Protocols
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The document discusses the importance of communication protocols in building automation, particularly in relation to the Siemens Desigo system. It covers the OSI model, protocol data units, and various building automation protocols including BACnet, Modbus, and KNX, outlining their integration methods and considerations for implementation. Key topics also include network topologies, physical media, and troubleshooting aspects in communication setups.
Introduction to Building Communication Protocols
- 1. Introduction to Building Communication Protocols and Integration to Siemens Desigo System Considerations Mahmoud Sayed Ahmed Senior BMS Commissioning Engineer www.linkedin.com/in/mahmoud-s-ahmed
- 2. Rules for communicating • For example, an Englishman and German are talking about animals on the telephone. • Even if they can hear each other clearly, they may not understand each other.
- 3. Communication Protocol • A protocol is a set of rules that governs how two devices communicate with each other. • A protocol must define, for example: • Who is allowed to access the transmission medium and when • How to detect data transmission errors and what happens when an error is discovered • What happens when a receiver receives more data than it can process at a time • How to ensure that data frames are sent to the right destination
- 4. Communication Protocol I like rabbits Ik hou van konijnen Ik hou van konijnen J’aime les lapins Ik hou van konijnen Ik hou van konijnen By Fax
- 5. OSI model • OSI “Open Systems Interconnection” Reference Model was developed by the “International Organization for Standardization” ISO in 1979. • The OSI model is a layered model that describes how information moves from an application program running on one networked computer to an application program running on another networked computer.
- 6. OSI Model Provides communication services and interfaces to applications (EX: File transfer, Electronic mail, WWW) Data formatting, translation, encryption, and compression (EX: ASCII, JPEG) Manages the dialog, synchronizes the data transmission this layer establishes, maintains, and terminates sessions between applications (EX: SMTP, SNMP, Telenet) Point-to-point error checking and data segmentation (EX: TCP, UDP) Represents logical routing between two computers (EX: IP) Transfer data and detect errors on the physical layer (MAC/LLC, Token ring, PPP, X.25) Sends and receives bits on the physical medium , Electrical and mechanical specifications What signal state represents a binary 1 (EIA-232, EIA-485, 10BASE-T) 7 Application 7 Application 6 Presentation 6 Presentation 5 Session 5 Session 4 Transport 4 Transport 3 Network 3 Network 2 Data Link 2 Data Link Computer 1 Computer 2 1 Physical1 Physical Physical medium between two computers (EX: CAT5 or CAT6 cables)
- 7. OSI Model • The unit in which a certain layer handles data is called a Protocol Data Unit (PDU). • Some layers add layer-specific information to the data. • This information added by the layers’ protocols can be in the form of a header, a trailer, or both.
- 8. OSI Model • The unit in which a certain layer handles data is called a Protocol Data Unit (PDU). • Some layers add layer-specific information to the data. • This information added by the layers’ protocols can be in the form of a header, a trailer, or both.
- 9. OSI Model for Building Automation Protocols • Any given protocols can be defined using some or all the OSI layers. • The missing layers in the implementation could either indicate a lack of implementation, or an open implementation. Physical Data link Network Transport Session LonTalk Konnex Presentation LonTalk Konnex Application MODBUS M-Bus LonMark Konnex MODBUS EIA-232, EIA-485 M-Bus M-Bus LonTalk LonTalk LonTalk LonTalk BACnet Konnex BACnet Konnex Konnex Ethernet, LonTalk, EIA-232 Konnex BACnet
- 10. Protocol Implementations Considerations 1. Do I need routers or gateways? • Some protocols can be integrated directly to management level (Desigo Insight or Desigo CC) and some protocols can be intrgrated through gateways or routers (TXM1(2).Open, PXC001(E).D, PXG3.L or PXG3.M. BACnet: Building Automation Control network, Revision 1.13 OPC Client: OLE for Process Control OPC DA 2.05, 3.0 ONVIF: Standard for IP video camera systems by Siveillance VMS Modbus TCP: Modbus IP communication protocol SNMP: SNMP Agents monitoring (V1 and V2) IEC 61850 Desigo CC V3
- 11. Protocol Implementations Considerations 1. Do I need routers or gateways? a. BACnet/LON can be integrated via PXG3.L router and BACnet/MSTP can be integrated via PXG3.L or PXG3.M routers.
- 12. Protocol Implementations Considerations 1. Do I need routers or gateways? b. LonWorks can be integrated via PXX-L11 (60 Device) or PXX-L12 (120 Device) used modular PXC controllers.
- 13. Protocol Implementations Considerations 1. Do I need routers or gateways? c. Modbus can be integrated via PXC001.D or PXC001.E.D PXC001(.E).D >>250 points PXC001(.E).D +PXA40-RS1>>800 points PXC001(.E).D +PXA40-RS2>>2000 points
- 14. Protocol Implementations Considerations 1. Do I need routers or gateways? d. Modbus can be integrated via TX Open modile connected to PXC modular Controller or PXC22.1.D/-E.D and PXC36.1.D/-E.D TXI2.OPEN >>160 points TXI2-S.OPEN>>40 points TXI1.OPEN>>100 points
- 15. Protocol Implementations Considerations 1. Do I need routers or gateways? e. KNX (TP) can be integrated via PXC001.D or PXC001.E.D. KNX/IP should be connected through KNX/IP gateway. PXC001.D/E.D >>2000 Points
- 16. Protocol Implementations Considerations 1. Do I need routers or gateways? f. M-Bus can be integrated via PXC001.D or PXC001.E.D or TX Open module and and M-Bus Signal Converter, With point limitations same as Modbus. Signal Converters: PW3 >> 3 Devices PW20 >> 20 Devices PW60 >> 60 Devices WZC-P250 >> 250 Devices
- 17. Protocol Implementations Considerations 2. Network topologies Bus topology Tree topology
- 18. Protocol Implementations Considerations 2. Network topologies Star topology Ring topology
- 19. Protocol Implementations Considerations 3. Physical medium (Cables types and routing) Shielding in cables protects the cable from external threats, such as electrical interference (EMI). It also prevents cable signals from interfering with surrounding cables and equipment. Cat5 cableUnshielded Twisted Pair (UTP) cable Shielded Twisted Pair (STP) cable JY(ST)Y Cable
- 20. Protocol Implementations Considerations 4. Date transmission rate, Bits per Second (bps) or Megabits per Second (Mbps) 5. Maximum allowed devices per network. 6. Maximum cable length between two node and maximum total cable length. 7. Do I need repeater or bus power supplies?
- 21. References Title Document ID# Publisher BACnet Application Guide for Consulting Engineers 125-1984T Siemens Building Technologies USA ANSI/ASHRAE Standard 135-2004 ISSN 1041-2336 ASHRAE Desigo™ Ethernet, TCP/IP, MS/TP and BACnet Technical principles CM110666en_10 Siemens Building Technologies Desigo™ Building automation system 6.1 Technical Principles CM110664en_01 Siemens Building Technologies Desigo™ Room automation Engineering, mounting and installation Manual CM111043en_10 Siemens Building Technologies DesigoCCV21_3rd party BACnet_EDE_Step-By-Step- Guide ---------------------- Siemens Building Technologies Building Automation Communication Systems with EIB/KNX, LON and BACnet ISBN: 978-3-540- 88828-4 Springer Communication in building automation ----------------------- Siemens Building Technologies
Editor's Notes
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