Siemens QAX903 Basic Documentation Download Page 21

Page: 21 / 88

For internal use only

21 / 88

Siemens

KNX bus communications

CE1P3127en

Building Technologies

Engineering notes

2013-04-08

2.3 Bus topologies

Allowed bus topologies: Tree, line and star topologies. These topologies can be
mixed as needed. However, ring topologies are not allowed.

The tree topology is advantageous if a large network must be created.

Tree topology

(with stub lines)

Line topology

(with loops)

KNX TP1

N1 .. N7 Bus devices

CE+

CE-

CE+

CE-

CE+ CE-

Device with
screw terminals

T-branch with
bus terminal

Device with
spring cage terminals

CE+ CE-

CE-

CE+

CE-

N1 .. N8

Bus devices

Advantage:
Tree topology

Branching and
connection variants

Summary of Contents for QAX903

Page 1: ...s 3127Z01 Synco KNX bus communications Device range Synco 700 Synco living RXB RXL RDG RDF RDU Basic documentation Edition 3 0 CE1P3127en 2013 04 08 Building Technologies For internal use only ...

Page 2: ...E1P3127en Building Technologies 2013 04 08 Siemens Switzerland Ltd Sektor Infrastructure Cities Building Technologies Division Gubelstrasse 22 6301 Zug Switzerland Tel 41 41 724 24 24 http www siemens com sbt 2003 2013 Siemens Switzerland Ltd Subject to change ...

Page 3: ...s 19 2 2 3 Central bus power supply 20 2 3 Bus topologies 21 2 3 1 Distances and cable lengths 22 3 Commissioning notes 25 3 1 Points to check prior to commissioning 25 3 2 Commissioning with RMZ operator units 26 3 2 1 Start commissioning plant mode Off 26 3 2 2 Finish commissioning plant mode Auto 28 4 Device address and device name 29 4 1 RM controllers 29 4 1 1 Read area line and device addres...

Page 4: ...ia couplers and IP routers 57 8 2 5 System time alarms and remote time adjustment 59 8 3 Engineering large plants 60 9 Appendix 63 9 1 Faults and errors 63 9 1 1 Fault status message bus 63 9 1 2 Communication error 64 9 2 Heating cooling changeover 65 9 2 1 Changeover via digital input 66 9 2 2 Changeover via analog input 67 9 2 3 Changeover based on calendar 68 9 2 4 H C changeover relay and fau...

Page 5: ...anufacturers interworking Certify products that comply with KNX standards Simplify commissioning of devices in KNX networks Open the KNX bus to communications providers and utilities companies Exploit various transfer media Bus TP1 wireless RF and power line PL The Synco devices are designed for HVAC applications and individual room control They are used in Residential buildings Business and admin...

Page 6: ...ce is anticipated For further details refer to data sheet N3127 The KNX bus uses CSMA CA CSMA Carrier Sense Multiple Access CA Collision Avoidance to access the bus With this method of access every bus user has equal data transmission rights There is no communication master in contrast to the master slave principle The data is exchanged directly peer to peer between bus users A collision avoidance...

Page 7: ...ol Software For the various HVAC lighting and security equipment and for integration into higher level building automation and control systems selected data points of the Synco devices can also communicate in S Mode Data points are also referred to as communication objects Description BK Area coupler see Section 1 4 DPSU Decentral Power Supply Unit see Section 2 2 1 E Mode Easy Mode LTE Mode is on...

Page 8: ... up to 250 Synco devices OZW771 OZW772 N3117 N5701 Central apartment unit To manage one apartment Heating cooling ventilation control of lighting and blinds door and window monitoring QAX903 QAX913 N2741 N2740 Room controllers For fan coil units with 3 speed fan control For fan coil units with 3 speed fan control and electric heating coil For fan coil units with 3 speed fan control For fan coil un...

Page 9: ...lers RXL21 1 RXL22 1 Room controllers RXB39 1 RXL39 1 The term Room thermostats RDx refers collectively to the following types Room thermostats RDG100KN RDG400KN Room thermostats RDF301 RDF301 50 Room thermostat RDU341 The term Central communication unit OZW77x refers collectively to the following types Central communication units OZW771 xx where xx 4 10 64 Web server OZW772 xx where xx 1 4 16 250...

Page 10: ...roduct markings on Synco bus devices The Synco bus devices are labeled with product markings with the following meanings KNX Logo Devices with this logo are certified by KNX KNX transmission medium TP1 stands for Twisted Pair 1 1 pair of twisted wires KNX configuration mode EE stands for Easy mode Logical Tag Extended TP1 EE ...

Page 11: ...2 3 64 1 2 3 64 1 2 3 64 1 2 3 64 1 2 3 64 Ac 1 0 0 Lc 1 1 0 Lc 1 2 0 Lc 1 3 0 Lc 1 15 0 Area 1 Line 1 Line 2 Line 3 Line 15 Main line 1 Lc 0 1 0 Lc 0 2 0 Line 1 Line 2 Ac 2 0 0 Lc 2 1 0 Lc 2 2 0 Lc 2 3 0 Area 2 Line 15 Main line 2 Ac 3 0 0 Lc 3 1 0 Lc 3 2 0 Lc 3 3 0 Lc 3 15 0 Area 3 Line 15 Main line 3 Ac 15 0 0 Lc 15 1 0 Lc 15 2 0 Lc 15 3 0 Area 15 Line1 Line 2 Line 3 Main line 15 Area line 0 ba...

Page 12: ...rom main line 15 have physical addresses from 15 1 0 to 15 15 0 1 3 2 Network address The network address for a full scale KNX network consists of the area line and device address It reflects the exact position of a bus device in the overall network and is unique within the network Syntax Area Line Device Range 0 Ex works for Synco bus devices 0 backbone Range 1 15 Line 1 15 Ex works for Synco bus...

Page 13: ...tory set device address for the OZW772 web server device address 150 can be modified 252 is used to connect the RMZ792 bus operator unit i e the bus operator unit uses this address if it is free otherwise it starts at 252 and looks for the next lower unused address 254 is used to connect the ACS790 software on PC laptop i e the OCI700 1 service tool adopts this address if free or starts at 254 and...

Page 14: ... x3 bus connected to main line and line via bus terminals For further information see the product description and description of functions enclosed with the device or under IP 1 routers are required when a KNX network needs to be connected to an IP network As a device the IP router is not technically the same as the area line couplers Instead of establishing a link within KNX a KNX IP network link...

Page 15: ...agram Network size within allowed limits 7 Determine type of bus power supply Distributed bus power Central bus power supply 8 Check limits Number of bus devices per line and area Size of network Adequate bus power with reserve for later expansion 9 Create network structure and wiring diagram Complete installation and commissioning documents When structuring a network special attention should be p...

Page 16: ...s devices are permitted in device address range 1 254 Theoretically a total of 16 320 bus devices could be installed in a full KNX TP1 wired network In practice the number is approximately 12 000 bus devices Based on 960 bus devices per area and a full scale network comprising 15 areas up to 14 400 bus devices can be installed in one network 64 bus devices can be connected to each of the 15 main l...

Page 17: ...See the caution notice below Since the devices which are factory set to Decentral bus power supply On are distributed on the bus they are referred to as Distributed bus power supply units DPSU Devices with the setting Decentral bus power supply On must not be installed on the same line as third party devices In such cases the devices must be set to Decentral bus supply Off and a power supply unit ...

Page 18: ...00 service interface plus the OZW771 central communication unit Per line the rule is 1 device with a DPSU 2 devices with no bus power supply OCI700 OZW771 up to a maximum of 8 devices with a DPSU 16 devices with no bus power OCI700 OZW771 An RM controller with a DPSU delivers a net current of 25 mA This covers the power consumption of 5 devices without a bus power supply 5mA each required 8 device...

Page 19: ...n values for Synco devices without a bus power supply unit QAWZ40 room unit 7 5 mA RXB RXL room controllers 5 mA RMZ792 bus operator unit without external supply 45 mA with external AC 24 V supply 5 mA OZW771 xx central communication units 5 mA OZW772 xx web server 5 mA VAV controller GxB181 1E KN 5 mA Room thermostats RDF RDG RDU 20 mA Room thermostat RDF600KN 5 mA Flush mounted sensor AQR2570 5 ...

Page 20: ...nts of the devices must be calculated as a means of determining the required power supply unit PSU See the relevant values on the previous page For a line with 64 bus devices each with a power consumption of 5 mA 64 x 5 mA 320 mA a PSU of 320 mA is sufficient For KNX networks the following PSUs by Siemens are recommended Order types 5WG1 125 1AB02 short code N125 02 160 mA with integrated choke 5W...

Page 21: ...gies are not allowed The tree topology is advantageous if a large network must be created Tree topology with stub lines Line topology with loops N2 N2 N1 N3 N4 N1 N4 N5 N6 N7 N3 KNX TP1 KNX TP1 3127Z02 N1 N7 Bus devices CE CE CE CE CE CE Device with screw terminals T branch with bus terminal Device with spring cage terminals 3127Z06en CE CE CE CE N1 N2 N5 N6 N7 N3 N4 N8 CE CE N1 N8 Bus devices Adv...

Page 22: ...power supply unit In a KNX network with central bus power PSU see Section 2 2 2 note the following information on distances Distance between two power supply units PSU Min 200 m Distance between bus device and nearest PSU Max 350 m Distance between bus devices Max 700 m Total length of all cables of one line Max 1000 m At least one power supply unit PSU is required for each line and the maximum pe...

Page 23: ... distance of 700 m between bus devices cannot be integrated in the bus if bus device N3 is integrated with a loop instead of subline If a max distance of 350 m is kept between the centralized bus supply PSU and the bus device without bus supply the bus supply must be placed at location 150 m 250 m on the line distance 400 m 100 m N1 N4 3127Z04en N2 200 m 100 m 100 m 400 m N3 200 m 100 m N5 Total l...

Page 24: ...24 88 For internal use only Siemens KNX bus communications CE1P3127en Building Technologies Engineering notes 2013 04 08 Empty page ...

Page 25: ...unit Synco living central apartment unit QAX9x3 Devices without a direct connection for the operating voltage QAW740 room unit and operator units RMZ790 RMZ791 Existing bus power supply Delivered by DPSU Synco 700 devices set to Decentral bus power On PSU Central bus power supply from power supply unit s Check that the plant is ready for operation Commissioning is described in detail in the instal...

Page 26: ...ord Password level Square with key 2 Highest access level password Commissioning requires access to the password level From the start page the user logs in with the password and navigates to the required operating page or operating line via the predefined path Wednesday 28 05 2003 15 06 Welcome Information Main menu Press the OK press and select knob on the operator unit to access the Main menu pa...

Page 27: ...issioning page is displayed the following warning appears Caution Plant stops ESC OK Acknowledge the display OK by pressing the knob the plant stops The Commissioning page now appears Commissioning Basic configuration Extra configuration Settings Communication Select the Communication line for example by rotating the knob and press the knob to open the Communication page Main menu Commissioning Co...

Page 28: ...see Section 3 2 1 it must be reset to Plant operation Auto when commissioning is complete When commissioning is complete e g after Basic settings see the operating page above the repeated pressing of the ESC button results in the following warning Caution Plant starts ESC OK Acknowledge the display of OK by pressing the knob the plant is started The display then returns to the main menu Before exi...

Page 29: ...settings can be read with the RMZ790 RMZ791 and RMZ792 operator units at the Service level indicated by the symbol From the start page press the OK knob for access to the Main menu see below Wednesday 28 05 2013 15 06 Welcome Information Main menu On delivery from the factory the start page displays the word Welcome instead of the device name Main menu Time of day date Faults Settings Device infor...

Page 30: ...e permissible only if The Synco bus devices are installed in Area 0 and Line 2 of a network and not assigned to other areas and lines by means of super ordinate area and line couplers The other basic settings under Communication can be read by rotating the knob clockwise Basic settings Dec bus power supp On Clock time op Master Rem set clock slave Yes Remote reset fault No 4 1 2 Assign device name...

Page 31: ...ge Turn the knob clockwise and select a character Press the knob to import the selected character to the text line Save the text line in the device Turn the knob counterclockwise until the OK field is displayed Press the knob to save the text line in the device Press ESC repeatedly to return to the start page and check the device name The device name may contain up to 21 alphanumeric characters ma...

Page 32: ...lows Main menu Commissioning Communication Basic settings Basic settings Device address 255 Dec bus power supp On Clock time op Master Rem set clock slave Yes Turn the knob as required to access setting mode Device address 255 1 255 In setting mode set e g Device address 10 by rotating the knob as required Device address 10 1 255 Press the knob to confirm the setting An internal test to check for ...

Page 33: ... Operating software Service software Documentation 2 OCI700 service interface 3 USB cable Type B socket 4 KNX service cable RJ45 For Synco devices 5 LPB service cable RJ12 For SIGMAGYR and ALBATROS controllers not illustrated below The OCI700 service interface converts the signals between the USB port on the PC laptop and the tool interface on the bus device RJ45 connection There is no need to set...

Page 34: ...ntrollers RX room controllers QAX9x3 central apartment unit OZW772 web server All other bus devices have no tool interface Communication with these devices is possible indirectly via Synco devices with a tool interface and the KNX bus The OCI700 service interface does not supply power to the KNX bus A central or distributed bus power supply unit is required to communicate via the KNX bus see Secti...

Page 35: ...power supp On See Section 2 2 for information about the bus power supply 6 1 2 Clock time operation Clock time operation refers to the transmission of the date and time For the RM controllers this is set on the Clock time op line of the Basic settings operating page Main menu Commissioning Communication Basic settings Basic settings Device address 10 Dec bus power supp On Clock time op Master Rem ...

Page 36: ...d date in the time master can be changed as follows By the user on the time master By the user by remote adjustment of the time slave A user adjustment of the time or date can be synchronized by pressing the rotary knob Only one bus device at a time can be the time master in a network In relation to date and time the other bus devices must be set as time slaves or set to Autonomous 6 1 3 Set time ...

Page 37: ...Autonomous 3127Z38en Has its own time of day Remotely set time of day 10 24 Receives 10 24 Time day for timer function Receives 10 24 For its timer functions the QAW740 room unit requires the time from the time master It can receive the time over the KNX bus subject to the following criteria A bus device must be defined as the time master setting Clock time op Master The QAW740 room unit is connec...

Page 38: ...set of fault Yes with the OCI700 1 service tool the RMZ792 bus operator unit the OZW772 web server and the OZW775 central communication unit Main menu Commissioning Communication Basic settings Basic settings Dec bus power supp On Clock time op Slave Rem set clock slave Yes Remote reset fault Yes Remote reset of faults for the RM controllers Default value No Setting values No Yes Apart from the RM...

Page 39: ...ve zone apartment x 1 126 Master slave zone room x 1 63 Master slave zone subzone x 1 15 QAW op zone apartment X 1 126 Heat distribution zone x x x x x X 1 31 Heat distr zone source side x x x x 1 31 Heat distr zone consumer side x x x 1 31 Heat distr zone heating surface x 1 31 Heat distribution zone air heater x 1 31 Heat distrib zone primary distr x 1 31 Heat distrib zone primary ctrller x 1 31...

Page 40: ...e process values to be exchanged between the devices in a zone A further requirement is that the device address should be set in the devices T 1 2 9 44 RM RM QAW740 RXB Outside temperature Outside temp zone 2 Room temperature Geogr zone 1 Geogr zone 1 Heat requis Heat zone 1 Heat demand Time switch operation Process value Zone Address Process value Zone Address Process value Zone Address Time swit...

Page 41: ...nt might better be referred to as an operating zone The Geographical zone apartment is used together with RM controllers RXB RXL room controllers RDG RDF RDU room thermostats and QAW740 room unit Main menu Commissioning Communication Room Room Geogr zone ap 1 Time switch op Autonomous TS slave apartm 1 Room Geogr zone ap TS slave apartm Time switch op Autonomous Geographical zone apartment RM defa...

Page 42: ...This default value indicates that the zone is out of service i e no relevant process values are transmitted within this zone Main menu Commissioning Communication Room Operating line Range Factory setting or default value Geographical zone apartment 1 126 Time switch slave apartment 1 126 Factory setting or default value applies to all RM series B controllers In the Autonomous controller applicati...

Page 43: ... see Geogr zone in the illustration Only one controller may be the time switch master in any one zone The setting for the master is TS slave apartm A time switch master can control one or more time switch slaves in different zones The setting for the slaves is TS slave apartm x where x 1 126 the zone address of the time master For a detailed description of time switch operation with the RMU7x0B co...

Page 44: ...sal transmission and reception zones Safety related plants and equipment e g fire shutdown smoke extraction frost protection If simultaneous startup response of plants is active Applications where communications failure of transmission or receptions zones can cause damage Control paths that are time criticial or more sophisticated e g speed control via pressure humidity Compulsory main control var...

Page 45: ...evice 1 RMS705B device 2 Value Terminal Transmission zone Terminal Reception zone N Y1 1 N X1 1 Air quality mean value Transmit Receive The following is configured in RMS705B device 1 Main menu Commissioning Communication LTE transmission zones Operating line Range Factory setting N Y1 1 The following is configured in RMS705B device 2 Main menu Commissioning Extra configuration Input identifier Op...

Page 46: ... ap 1 Time switch op Autonomous TS slave apartm 1 7 2 2 QAW740 room unit The QAW740 room unit only contains the Geographical zone apartment The zone address can be set via the operator controls on the front of the unit Step Action Operating element 1 To access the setting mode press the presence button for ca 6 seconds Letter A is displayed and the zone address can be set 2 Set the zone address wi...

Page 47: ...es with room functions should be located on the same line as the devices with which they exchange data via KNX in LTE Mode i e Synco QAW740 room unit Synco RM controllers RXB RXL room controllers Synco RMB795B central control unit Room thermostats RDG RDF RDU Synco central control unit RMB795B Synco RM controllers for room control combinations see Section 9 3 Only one bus device in the network may...

Page 48: ... 0 1 RMB 2 0 10 RX RX 2 0 20 RX 2 0 250 N140 13 0 2 254 1 N140 13 15 0 1 RM 1 N140 13 0 2 252 RMZ792 15 0 2 RMB 15 0 10 RX RX 15 0 250 15 1 10 RX RX 15 1 250 RM RMB 15 1 1 15 0 252 RMZ792 USB Line 1 Line 2 Line 15 Main line 1 Area 0 ACS alarm pager SMS fax Main line 2 PC with ACS Service interface Line 1 Main line 15 3127Z42en connector Bus connector socket Service cable RJ45 Ac 1 0 0 Ac 15 0 0 Lc...

Page 49: ...MZ792 2 0 252 15 1 10 RX 15 1 250 RMB 15 1 1 RX Line 1 Line 2 Line 15 Main line 1 Main line 2 Line 1 Main line 15 3127Z43en IP network Area line 0 PC with ACS Service interface Service cable Ac 1 0 0 Ac 2 0 0 Ac 15 0 0 Lc 1 1 0 Lc 1 2 0 Lc 1 15 0 Lc 15 1 0 LTE filter table 1 Normal route 2 Route all If Synco devices are used as alarm sinks see the OZW775 central communication unit and RMZ792 bus o...

Page 50: ...ble RJ45 connector Bus connector socket Bus power supply Input and display unit Input and display unit Line 1 Main line 15 Switch actuator 3127Z44en Bus power supply Switch actuator Ac 1 0 0 Ac 2 0 0 Ac 15 0 0 Lc 1 1 0 Lc 1 2 0 Lc 1 15 0 Lc 15 1 0 LTE filter table 1 Normal route 2 Route all 3 Block all If the filter is set to Block all for area coupler Lc 15 0 0 no LTE telegrams are transmitted be...

Page 51: ...at5 cable Observe the following rules when using IP routers With an IP router used as an area coupler IP Ac no other IP routers may be installed below the IP Ac in the topology With an IP router used as a line coupler IP Lc no other IP routers may be installed above the IP Lc in the topology When IP routers are used for coupling to an IP network the following issues must be discussed with the IP n...

Page 52: ...3 0 2 x KNX KNX Ethernet cable Area line 0 IP Lc IP Lc Line 1 Line 2 3127Z09en A switch box is required for multiple IP router connections As part of the IP network the switch box represents area line 0 Use straight Ethernet cables to connect IP routers to the switch box 1 0 0 KNX 1 2 0 1 1 0 3 0 0 KNX 3 2 0 3 1 0 2 0 0 KNX 2 2 0 2 1 0 0 1 0 KNX 0 2 0 KNX Switchbox Line 1 IP Ac N146 Lc Line 2 Lc L...

Page 53: ...en Lc N140 13 Lc N140 13 Lc N140 13 Lc N140 13 Main line 2 KNX area 1 main line 1 IP network KNX area 2 main line 2 IP routers are also used to link worlds This method helps couple two or more KNX networks via an IP network In this case the IP routers connect the IP network to the KNX area line 0 of each involved KNX network The IP routers in all KNX networks must be set to KNX address 0 0 0 0 1 0...

Page 54: ...tables are only valid for Siemens area Iine couplers N140 x3 and Siemens IP router N146 Note S Mode telegrams are not subject to LTE filtering 8 2 1 Filter settings Filter settings in area line couplers and IP routers Normal route LTE telegrams of predefined zones and zone addresses are filtered see table in Section 8 2 2 Route all All LTE telegrams are routed Block all All LTE telegrams are block...

Page 55: ...one address in the filter table with the attributes Blocked or Routed are predefined and these attributes cannot be modified 1 The geographical zones comprise Geographical zone apartm Room Subzone Time switch zone apartment Room Subzone Time switch slave apartment Master slave zone apartm Room Subzone QAW op zone apartment 2 The heat distribution zones comprise Heat distr zone source side Heat dis...

Page 56: ...ne addresses 1 15 are communicated only within the line i e telegrams with these zone addresses are blocked LTE telegrams with zone addresses 16 31 are communicated outside that line i e telegrams with these zone addresses are routed Z addr 1 15 3127Z46en Zone addr 16 31 Normal route Z addr 1 15 Z addr 1 15 Zone addresses blocked by filter setting Normal route can be reused in other KNX areas and ...

Page 57: ...e aim is to prevent transmission of too many LTE telegrams e g heat demand signals from more than 15 devices in the same cycle If it is possible in a given plant to ensure that only a small number of LTE telegrams is transmitted in the same cycle or that the telegrams are short it is acceptable to configure more than 15 devices with the same zone and zone address However observing the recommendati...

Page 58: ...ZW775 1 N140 13 0 2 254 3 N140 13 2 N140 13 0 2 252 RMZ792 RX 15 1 2 15 1 1 RX 2 0 20 RX 2 0 21 RX RX 1 1 64 RX 1 1 2 RMB 1 1 1 N140 13 1 RX 1 15 64 RX 1 15 2 RMB 1 15 1 RM 15 0 3 RM 15 0 4 RM 2 0 2 RM 15 0 1 RM 15 0 2 RM 2 0 1 15 1 3 RX 15 1 4 RX 62 RX 4 RX 2 RX 62 RX AC 120 230 V N125 x1 USB Line 1 Heat zone source Refrig zone source Heat zone consumer 1 Refrig zone consumer 1 Line 15 Main line ...

Page 59: ...s on the primary line to devices on the secondary line and vice versa two way communication If the filter is set to Normal route in the area line couplers and IP routers alarms and remote time adjustments are transmitted only from the secondary line to the primary line one way communication If Route all is set alarms and remote time adjustments are transmitted from the secondary line to the primar...

Page 60: ... line couplers and IP routers are addressed before the bus devices the bus devices are ready to receive the area and line components of the address To keep communication to a minimum filter setting Normal route should be retained IP routers are factory set to obtain their IP address from a DHCP1 server ACS allows for manual assignment of the IP address 1 Dynamic Host Configuration Protocol DHCP is...

Page 61: ...resses into Synco bus devices the group addresses 30 3 254 and 30 3 250 referred to above must be set up in the ETS tool and connected Only then can the download be initiated Without group address 30 3 254 and a connection for the system time the time between the Synco bus devices after the first download can no longer be synchronized If a different group address is used for the system time this g...

Page 62: ...62 88 For internal use only Siemens KNX bus communications CE1P3127en Building Technologies Large plants 2013 04 08 Empty page ...

Page 63: ...ult status message bus All fault status messages are distributed over the KNX bus In this process the fault with the highest priority or in the case of equal priority the oldest fault can be displayed on the Fault status signal bus operating page access via Service level Main menu Faults Fault status message bus Fault status message bus Dev addr 0 2 5 1 identical geogr zone 1 Fault no 5402 05 06 2...

Page 64: ...master failure plant 1 5411 Room mast fail pl 2 Room master failure heating circuit 2 Fault no Fault message on RMZ79x operator unit Setting errors 6001 1 id device address More than one device with same device address 5002 1 clock time mast More than one clock time master 5102 1 time switch pl 1 More than one time switch program active in same zone plant 1 5112 1 time switch pl 2 More than one ti...

Page 65: ...onfigured in the H C Changeover function block Hand symbol selected The Heating Cooling mode is not affected by the type of changeover If several types of changeover are selected the required operating mode is determined in the following order of priority 1 Operating mode selector 2 H C changeover input 3 Heating cooling by calendar The required Heating Cooling mode is transmitted by the changeove...

Page 66: ...ng cooling distribution zone provided all controllers have the same heating cooling zone address 1 M T 1 T KNX 1 S1 S1 S1 S2 S2 x S2 S3 Q Y d 1 2 3 x Kältebedarf Q Y d S4 S4 S4 S5 1 2 3 2 M T 2 x Q 23 2 S1 S1 S1 S2 S2 x S2 S3 Q Y d 1 2 3 x Kältebedarf Q Y d S4 S4 S4 S5 1 2 3 x Q 23 T DI H C changeover Refrig demand Supervision Controller Controller Supervision Heat demand H C changeover Refrig dem...

Page 67: ... distribution zone If an analog signal is the source of the H C changeover two limit values must be selected for changeover For further information see basic documentation manual P3150 1 M T 1 KNX 2 M 2 T T 2 S1 S1 S1 S2 S2 x S2 S3 Q Y d 1 2 3 x Kältebedarf Q Y d S4 S4 S4 S5 1 2 3 x Q 23 1 S1 S1 S1 S2 S2 x S2 S3 Q Y d 1 2 3 x Kältebedarf Q Y d S4 S4 S4 S5 1 2 3 x Q 23 T AI Htg ClgCoil 1 Htg ClgCoi...

Page 68: ... S1 S1 S1 S2 S2 x S2 S3 Q Y d 1 2 3 x Kältebedarf Q Y d S4 S4 S4 S5 1 2 3 x Q 23 S1 S1 S1 S2 S2 x S2 S3 Q Y d 1 2 3 x Kältebedarf Q Y d S4 S4 S4 S5 1 2 3 x Q 23 S1 S1 S1 S2 S2 x S2 S3 Q Y d 1 2 3 x Kältebedarf Q Y d S4 S4 S4 S5 1 2 3 x Q 23 T M 1 2 Htg ClgCoil 2 3127S05 Htg ClgCoil 1 Flow Return H C changeover signal Heat refrig distribution zone 1 Precontrol H C changeover Supervision Controller ...

Page 69: ...actory setting Heating cooling ch over relay N Q1 N Q2 The current contact position status of the changeover relay can be displayed via the Service level Main menu Heating cooling ch over Operating line Current contact position status Heating cooling ch over relay Open Off Cooling Closed On Heating In a 2 pipe system without H C changeover signal on the KNX bus the controller continues to use the ...

Page 70: ...Radiator and floor heating The Room control combination function for example allows for e g heating a room with radiator heating and floor heating Exchanging room temperature and operating mode over the KNX bus allows for a joint control strategy with the following aim Optimum control e g boost enabled at the correct time Same room operating mode for both controllers time switch and holiday specia...

Page 71: ...ntrollers e g two RMU7x0B controllers they must be RMU7x0B controllers controlling the temperature in a warehouse the controllers can exchange information such as room temperature operating mode and setpoint over the KNX bus With this room control combination one ventilation controller must be set as the master and all the others as slaves QAW740 RMU RMU 3127Z49de Geogr zone 2 Room operating mode ...

Page 72: ...g mode Individual setpoints Slave internal setpoint The slave ventilation controller operates with its own setpoints Room with floor heating and ventilation Another application of the Room control combination is a room with floor heating and a ventilation system Exchanging the relevant process values over the KNX bus allows for a common control strategy with the following aim Optimum control heati...

Page 73: ... 0 If the same room is controlled by an RMU ventilation controller and an RMH heating controller the RMU ventilation controller in this room control combination must be set to Master QAW740 RMU RMH 3127Z50en Geogr zone 3 Room operating mode Geogr zone 3 Ventilation 1 Room control comb Master Room control comb Slave ext setpoints Room unit Geogr zone 3 Room operating mode Heating circuit 1 The heat...

Page 74: ...ilding can easily be divided into 5 room groups or geographical zone apartm Ground floor Geographical zone apartm 1 Room group 1 Stairwell Geographical zone apartm 2 Room group 2 All IT rooms Floors 1 4 Geographical zone apartm 3 Room group 3 All offices Floors 1 4 Geographical zone apartm 4 Room group 4 All labs Floors 1 4 Geographical zone apartm 5 Room group 5 3127Z15 3 5 2 4 5 2 4 5 2 4 5 2 4 ...

Page 75: ...4 Laboratory 1 1 floor Geographical zone apartment room 8 1 Laboratory 2 1 floor Geographical zone apartment room 8 2 Laboratory 3 1 floor Geographical zone apartment room 8 3 Laboratory 1 2 floor Geographical zone apartment room 9 1 Laboratory 3 4 floor Geographical zone apartment room 11 3 3 11 2 7 10 2 6 9 2 5 8 2 4 1 3 11 3 11 2 11 1 7 4 7 3 7 2 7 1 8 1 8 2 8 3 3 4 1 4 2 4 3 4 4 2 2 1 3127Z34 ...

Page 76: ...wn stream Up stream D1 C1 S1 Consumer side Source side The coordinator and dispatcher are defined as logical elements in the supply chain Their role is as follows The coordinator collates the demand signals from all downstream links in the chain and delivers the resulting demand signal to the link upstream The coordinator also reports the operational status of the upstream links to the downstream ...

Page 77: ...ded by the air supply chain The medium is treated in the air handling plant distributed via the ducting adapted if necessary by an air retreatment system to the requirements in the room and discharged into the room via air diffusers Branch to other rooms Cooling circuit Precontrol Heating circuit Heating surface Cooling surface Terminal units Air handling Hot water generation Chilled water generat...

Page 78: ...ference room control ventilation Coordinator Chilled water precontrol Chilled water precontrol Coordinator Chilled water production Dispatcher Chilled water production Chilled water production 9 5 1 Data exchange in LTE Mode The control chains and circuits in an HVAC plant consist of data points The data points or their process values are programmed in function blocks to create the technical funct...

Page 79: ...fore the process value is updated With a constant outside air temperature it may take a long time until the delta value is reached For this reason the outside air temperature is updated every 15 minutes This is referred to as a heartbeat If the outside air temperature is still not transmitted after the first 15 minute delay the controller waits another 15 minutes plus 1 minute i e a total of 31 mi...

Page 80: ... use or where the consequences may be severe Lightning protection is mandatory for public buildings and buildings with assembly rooms The necessity of erecting a lighting protection system is determined by the building codes of the related country Internal lightning protection is based on consistent equipotential bonding for lightning protection i e all metal components such as water heating and g...

Page 81: ...he manufacturers on the use of their products Lightning arresters can discharge high energy lightning current repeatedly without damage They are installed in the AC 230 400 V mains network and KNX network Lightning arrester Class B for the AC 230 400 V mains network Nominal leakage current of at least 10 kA 10 350 µs Protection level 4 kV Lightning arrester for the KNX network Nominal leakage curr...

Page 82: ...n cross section Cu 16 mm2 Al 25 mm2 Fe 50 mm2 230 400 V PE AC 230 V External lightning protection Bus device Surge arrester secondary protection Lightning arrester primary protection 3127Z14en Equipotential bonding rail Metal pipe duct Piping water room unit Bus device controller With Variants 1 and 2 a surge arrester must be installed as secondary on the bus device closest to the entry to the bui...

Page 83: ... surge arresters this results in a bus fault bus low resistance Note that no message is generated by this bus fault Faulty surge arresters must be replaced immediately Using surge arresters can improve the interference immunity of a KNX TP1 network regardless of any overvoltage protection measures in conjunction with lightning protection Surge arresters normally have the same dimensions as bus con...

Page 84: ...reparably It is important at the outset of engineering to avoid loops where possible or to keep the extent of any loops the loop area as small as possible The formation of loops must be considered in relation to the entire installation and all conductive components must be taken into account because the significant aspect of a loop is its overall area Note also Bus and mains voltage conductors pow...

Page 85: ...ent Buildings with computer centers require EMC protection management in addition to lightning and overvoltage protection If a KNX network is installed in a building of this type it must be part of the EMC protection management The EMC protection arrangements must be agreed in detail with the person responsible for EMC protection management ...

Page 86: ...CSMA CA 6 D Data points 7 Default in series B devices 42 Default values 28 Definition of terms 6 Design engineering procedure 15 Device address 13 Device address and device name 29 Device range Synco 700 Synco living RXB RXL RDG RDF RDU 8 Device types 9 Devices with a bus power supply 17 Devices without bus power supply 18 DHCP server 60 Distributed bus power 17 Distributor 76 E E characteristic 1...

Page 87: ...ice interface 33 One way communication 59 Overvoltage protection 83 P Physical address 12 Point to point connection 52 Power consumption of bus devices 19 Power supply unit PSU 20 Predefined LTE filter table 55 Producer 76 Product markings 10 R Read area line and device address 29 Remote reset of fault 38 RMB795 central control unit as collector 58 Room control combination 70 Room thermostats RDx ...

Page 88: ...s CE1P3127en Building Technologies 2013 04 08 Siemens Switzerland Ltd Sektor Infrastructure Cities Building Technologies Division Gubelstrasse 22 6301 Zug Switzerland Tel 41 41 724 24 24 www siemens com sbt 2003 2013 Siemens Switzerland Ltd Subject to change ...

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