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CA110335en_01 30.03.2007 Building Technologies 2 / 24 Siemens Building Technologies LonWorks networks CA110335en_01 30.03.2007 Table of contents 1 1.1 1.2 1.2.1 1.2.2 1.2.3 1.2.4 2 2.1 2.2 2.3 2.4 3 3.1 3.2 3.2.1 3.2.2 3.2.3 3.2.4 4 4.1 4.2 5 5.1 5.1.1 5.1.2 5.2 6 7 8 About this document .................................................. 4 Revision history ............................................................. 4 Before you start ............................................................. 4 Trademarks ................................................................... 4 Copyright ....................................................................... 5 Quality assurance.......................................................... 5 Use of documents / Request to the reader ................... 6 Introduction / Background ......................................... 7 Target ............................................................................ 7 Scope ............................................................................ 7 Target readers............................................................... 7 Glossary ........................................................................ 8 Principles ..................................................................... 9 Main characteristics....................................................... 9 Influencing factors ......................................................... 9 Topology guidelines ...................................................... 9 Bus termination guidelines .......................................... 10 Cable length guidelines ............................................... 11 Guidelines on the number of bus subscribers ............. 12 Empirical design values ........................................... 15 Free topology .............................................................. 15 Line topology ............................................................... 16 Topologies ................................................................. 17 Physical ....................................................................... 17 Free topology .............................................................. 17 Line topology ............................................................... 17 Logical ......................................................................... 18 Installation guidelines............................................... 19 Checklist for handover of the installation .............. 20 Troubleshooting ........................................................ 24 3 / 24 Siemens Building Technologies LonWorks networks Teble of contents CA110335en_01 30.03.2007 1 1.1 Version _01 Date 03.2007 About this document Revision history Changes LON replaced with "LONWORKS" New section Cable length Deleted: Recommended devices Added: ConCab cable Admissible cable types Section 1 3.2.3 3.2.4 4, 5 6 Pages 11 12 15, 16, 17 19 First edition 06.2003 1.2 1.2.1 Before you start Trademarks The table below lists the trademarks used in this document and their lawful owners. The use of these trademarks is subject to international and national statutory provisions. Trademark BACnetTM LonLinkTM, LON®, LonManager® , LONMARK® , LonTalk® LONWORKS® Neuron® Statutory owner American National Standard (ANSI/ASHRAE 135-1995) Echelon Corporation Echelon Corporation All the product names listed in the table are trademarks (TM) or registered trademarks (®) of their respective owners, as specified in the table. Further to the notes in this section, and to facilitate the reading of the text, these trademarks will not be indicated (e.g. by use of symbols such as ® or TM) elsewhere in the text. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 / 24 Siemens Building Technologies LonWorks networks About this document CA110335en_01 30.03.2007 1.2.2 Copyright This document may be duplicated and distributed only with the express permission of Siemens and may be passed only to authorized persons/companies with the required technical knowledge. 1.2.3 Quality assurance These documents have been prepared with great care. The contents of all documents are checked at regular intervals. All the necessary corrections are included in subsequent versions. Documents are automatically amended as a consequence of modifications and corrections to the products described. Please ensure that you are aware of the latest revision date of the documentation. If you find any lack of clarity while using this document, or if you have any criticisms or suggestions, please contact the product manager in your nearest branch office, or write directly to the support team at Headquarters in Zug (see below). Support address: Siemens Switzerland Ltd. Building Technologies Group International Headquarters Field Support 5500 Gubelstrasse 22 6301 Zug, Switzerland Tel +41 41 724 5500 Fax: +41 41 724 5501 E-mail: fieldsupport-zug.ch.sbt@siemens.com . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 / 24 Siemens Building Technologies LonWorks networks About this document CA110335en_01 30.03.2007 1.2.4 Use of documents / Request to the reader Before using our products, it is important that you read the documents supplied with or ordered at the same time as the products (equipment, applications, tools etc.) carefully and in full. More information on the products and applications (e.g. system descriptions etc.) is available via the Internet/intranet at https://intranet.sbt.siemens.com/desigo-field/en/pro/pro_roo.asp. We assume that the users of these products and documents have the appropriate authorization and training, and that they are in possession of the technical knowledge necessary to use the products in accordance with their intended application. Should there still be a lack of clarity or other problems associated with the use of the documentation, please do not hesitate to contact the Product Manager at your nearest branch office, or get in touch directly with the support team. E-mail: fieldsupport-zug.ch.sbt@siemens.com Please note that without prejudice to your statutory rights, Siemens accepts no liability for any losses resulting from non-observance or improper observance of the points referred to above. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 / 24 Siemens Building Technologies LonWorks networks About this document CA110335en_01 30.03.2007 2 · · · · · Introduction / Background The following is a list of some common mistakes associated with the physical installation of LONWORKS networks: Incorrect bus terminators (wrong position or value) Use of the wrong cables Loose connections (inadequate contact) Max. cable length exceeded Incorrect routing of cables (e.g. parallel to the power cables of variable speed drives, causing EMC problems) · Incorrect topology · Incomplete or inadequate project documentation With simple guidelines and check lists, these errors can be avoided. 2.1 Target The overall aim is to prevent problems from arising, through proper planning and correct physical installation of the LONWORKS networks. 2.2 Scope This document does not go into engineering, commissioning and maintenance procedures. The information which follows applies to LONWORKS networks communicating at 78 Kbps (kilobits per second). LONWORKS networks at 1.25 Mbps are not dealt with here. 2.3 Target readers This document is primarily intended for commissioning and service engineers and other engineering and sales personnel. To keep later additional costs as low as possible, it is important, even in the sales phase, to take account of the relevant constraints. 7 / 24 Siemens Building Technologies LonWorks networks Introduction / Background CA110335en_01 30.03.2007 2.4 Term Router Glossary Description Routers filter data packets. They only forward packets for which there is a destination device at the other end of the router. The filtering process is based on information from the Network Layer. Routers have to be configured. Gateway Gateways operate at the Application Layer. They perform the conversion from one application protocol to another, e.g. from LONMARK to BACnet. There are other gateways that keep the same application protocol, e.g. LONMARK to LONMARK (RXZ03.1 point coupler). Gateways have to be engineered. Bus repeater Repeaters regenerate the electrical or optical signal. They are not responsible for packet filtering. LONWORKS distinguishes between: ­ Physical repeaters Straightforward conditioning of the electrical signal only (without neuron chip) ­ Logical repeaters Electrical and logical signal conditioning (timing and checksum) 8 / 24 Siemens Building Technologies LonWorks networks Introduction / Background CA110335en_01 30.03.2007 3 Principles For the principles in detail, and guidance on the planning and installation of LONWORKS networks please refer to the relevant installation guides. DESIGO RXC: DESIGO PX: CA110334 Installation guide CA110396, Mounting and installation guide . . . 3.1 · · · · Main characteristics Topology (line or free) Transceiver type (FFT10 or LPT10) relevant for bus supply Number of bus subscribers (nodes) Type of supply. Some third-party devices do not use the same voltages as the Siemens devices, and will require an additional transformer. 3.2 Influencing factors The characteristics of the network are influenced by the factors detailed below. 3.2.1 Topology guidelines The bus topology is determined by the required cable lengths and the structure of the building. 01890en Main bus cable Stubs Building structure Length of stubs from the main bus cables: 9 / 24 Siemens Building Technologies LonWorks networks Principles CA110335en_01 30.03.2007 <3m >3m Notes Line topology Freie Topologie In RXC systems, the bus stub is often connected to the room unit. We recommend that this should only be done in cases where access to the LONWORKS network is absolutely essential. The extra cable length must be taken into account. · Frequently this results in stubs of more than 3 m, necessitating a free topology. · These additional cables are also susceptible to EMI (they act as antennae for interference). 3.2.2 Bus termination guidelines · Line topology 2 bus terminators, 105 each (RXZ02.1) at each end of the network. · Free topology 1 bus terminator, 520 (RXZ01.1) at the key point in the network. Note System devices (repeaters and routers) often have a built-in bus terminator with a resistance selector. 10 / 24 Siemens Building Technologies LonWorks networks Principles CA110335en_01 30.03.2007 3.2.3 Cable length guidelines When deciding on the topology, relevant factors are the maximum cable length and the maximum distance between two bus subscribers. Various tested cable types are suitable. For details refer to the RXC installation guide, document CA110334. Cable length Cable type Max. Max. cable length (including cables to room units) 450 m 450 m 500 m 500 m 500 m FTT only 900 m 900 m 900 m 1400 m 2700 m Max. distance between two devices (nodes) 250 m 250 m 320 m 400 m 500 m FTT & LPT No info No info 750 m 1150 m 2200 m . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . _ _ _ Free topology Category 5 ConCab JY(St)Y 2x2x0.8 Level IV Belden 8471 Line topology Category 5 ConCab JY(St)Y 2x2x0.8 Level IV Belden 8471 If shielded cable is used, the shield must be capacitively earthed (connected to ground) at least once per segment. In the event of a high level of interference, this may be required at each node. For details refer to the RXC installation guide, document CA110334. If LPT-10 nodes (QAX5..) and bus power supply are used, the DC power consumption of the LPT nodes must be taken account of when designing the cable length and cross section (line resistance). For details refer to the RXC installation guide, document CA110334. The cable length can be doubled by use of a physical repeater. STOP Caution No more than 1 physical repeater may be connected in series. 01891 max. cable length Physical Repeater max. cable length 11 / 24 Siemens Building Technologies LonWorks networks Principles CA110335en_01 30.03.2007 3.2.4 Guidelines on the number of bus subscribers The relevant factor here is the number of bus subscribers per physical segment or channel. A physical segment is a continuous section of the LONWORKS network, uninterrupted by repeaters, routers or gateways. The number of bus subscribers per physical segment can be calculated using the following formula: (Number of bus subscribers with LPT10 transceivers) + (2 * number of bus subscribers with FTT10 transceivers) 128 Note Rather than connecting the maximum load to the segments, we recommend the inclusion ...