Data Sheet for Product

ManualsBrandsSiemens ManualsToolsService tool OCI700.1

CE1N3127en

18.02.2008

Building Technologies

HVAC Products

127

3127Z01

Synco™

KNX bus

Product range Synco 700, 900, RXB/RXL

• The KNX bus (Konnex) allows Synco devices to communicate among each

other and with third-party products (interworking).

• The basic version of the KNX bus comprises a cable with one stranded wire

pair.

• Area/line couplers and IP routers are used in KNX networks.

Use

The Synco devices listed below have a KNX bus connection.

• Universal controllers RMU710, RMU710B / RMU720, RMU720B / RMU730,

RMU730B

• Heating controllers RMH760, RMH760B

• Boiler sequence controller RMK770

• Central control unit RMB795

• Control & monitoring device RMS705

• Bus operator unit RMZ792

• Room unit QAW740

• Room controllers RXB21.1, RXB22.1 / RXL21.1, RXL22.1 / RXB24.1, RXL24.1

• Central communication units OZW771.04, OZW771.10, OZW771.64 / OZW775

• Service interface OCI700

• Central apartment unit QAX910 (Synco living)

Note: The KNX logo is clearly visible on devices certified by the KNX Association.

Synco devices for KNX

Summary of content (10 pages)

PAGE 1
3127Z01 3 127 Synco™ KNX bus Product range Synco 700, 900, RXB/RXL • The KNX bus (Konnex) allows Synco devices to communicate among each other and with third-party products (interworking). • The basic version of the KNX bus comprises a cable with one stranded wire pair. • Area/line couplers and IP routers are used in KNX networks. Use Synco devices for KNX The Synco devices listed below have a KNX bus connection.
PAGE 2
Functions Transmission medium The KNX bus sends data using TP (twisted pair, stranded wire pair) as transmission medium. The following data is sent via the bus: • Configuration data and operator entries. • Fault and acknowledgement messages. • Process values and history data. Communication LTE mode S-mode Synco devices intercommunicate via zone addresses (= logical tags) in LTE mode (LTE = logical tag extended).
PAGE 3
Engineering notes A complete KNX network comprises three tiers. Area line 0 represents the network backbone. KNX network 15 main lines each branch off of the area line via area couplers Ac (area 1…15), and 15 lines (lines 1...15) each branch off of each main line via line couplers Lc. Area 15 Ac 15.0.0 ea 2 Lc 15.3.0 1 1 Line 3 a Line 2 (b 1 Line1 0 Lc 15.2.0 2 2 3 3 3 64 64 64 Area 3 Ac 3.0.0 3127Z10en Ar e lin ne bo k c Lc 15.1.
PAGE 4
Addressing Network address The network address is composed of the area, line, and device address (A.L.D) even if no area and line couplers are used. The network address reflects the bus device's unique position in a KNX network and is unique within the related network. Area and line coupler addressing must already be laid out during planning in accordance with the network structure. See document P3127 for more information on addressing.
PAGE 5
Siemens power supply units Power supply units for KNX networks without IP router. Ordering: 5WG1 125-1AB01, short description N125/01, power output 160 mA. 5WG1 125-1AB11, short description N125/11, power output 320 mA. Data: Operating voltage Bus supply output Notes: Both types feature an integrated choke. Both types may concurrently supply a line. Adhere to the min. distance of 200 meters between two power supply units. AC 120…230 V, 50…60 Hz. DC 29 V (21…30 V, with choke).
PAGE 6
Installation notes Lay bus cables Local regulations on insulation against mains voltage (SELV as per EN 60730) apply if the bus cable is laid in parallel to lines of a three-phase network (3 x AC 400 V). Bus topologies Permissible bus topologies are: Tree, line, and star topologies. These topologies can be mixed as needed. However, ring topologies are not allowed. Advantage: Tree topology The tree topology is advantageous if a large KNX network must be created.
PAGE 7
Bus connection In Synco devices, the bus lines are connected to terminals CE+ (red) and CE– (black). Observe the polarity of the bus lines CE+ and CE– and do not interchange them. Notes In Synco devices with spring cage terminals, only one wire can be inserted per spring cage terminal. For this reason, terminals CE+ and CE– are available in double and connected inside the device. Identify the terminal polarity in third-party devices, e.g. CE+ at bus terminal 1, and CE– at bus terminal 2.
PAGE 8
Distances and line lengths (examples) N1 Distance between bus devices max. 700 m. Not allowed: N1 to N4 = 900 m N2 to N4 = 800 m 200 m 400 m 150 m 100 m N2 PSU 100 m N4 250 m Distance between bus device and bus supply max. 350 m. Not allowed: N4 = 550 m 100 m 100 m N3 3127Z03en Example 1 N1…N4 Bus devices Distances Bus device N4, by adhering to the maximum 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).
PAGE 9
Commissioning notes Commissioning aspects Wiring KNX bus Observer the following commissioning aspects to commission a KNX network as intended. Check the bus wiring prior to commissioning, and make sure that the bus line polarity is not interchanged (terminals CE+ and CE–). Important: Do not interchange the bus line polarity. Operating voltage Check the operating voltage wiring to make sure that the devices are connected to AC 24 V or AC 230 V (as per the technical device information).
PAGE 10
Zone addresses, LTE mode During commissioning, set the zone addresses as per the plant functions. Set the zone addresses in Synco 700 devices via operator units RMZ790 and RMZ791, and locally via QAX910 for the central apartment unit (Synco living). The service tool OCI700.1 (part of the ACS7… software package) allows for efficient zone addressing in complex plants featuring many Synco devices.