User manual SIEMENS DESIGO LONWORKS NETWORKS

[. . . ] . YC YH Q1 T D2 D1 B1 DESIGO ®TM LonWorks networks Check list . . 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ] . 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 (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 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. Routers, PC-based tools and the PXR itself are also bus subscribers. 14 / 24 Siemens Building Technologies LonWorks networks Principles CA110335en_01 30. 03. 2007 4 4. 1 Activity Max. cable length for Category 5 cable or ConCab Empirical design values Free topology Recommendation 250 m Practical experience and comments The actual cable length is difficult to estimate. [. . . ] For nodes with LPT10 transceivers, the DC voltage should be between 38. 5V and 42. 6V. 1st node with LPT10: DC voltage: 2nd node with LPT10: DC voltage: nth node with LPT10: DC voltage: ___VDC ___VDC ___VDC Correctly labeled: Yes/No 2nd sample Correctly labeled: Yes/No n sample th Correctly labeled: Yes/No In the absence of a bus power supply, a DC source (battery or DC power supply unit) may be used. The voltage must not exceed the bus power supply range (<42. 6V). LONWORKS communications are not possible while the external power supply is connected. [. . . ]