Technical data
Table Of Contents
- 1. About this document
- 2. Summary
- 3. Functions
- 3.1 Temperature control
- 3.2 Operating modes
- 3.3 Room temperature setpoints
- 3.4 Applications overview
- 3.5 Additional functions
- 3.6 Control sequences
- 3.7 Control outputs
- 3.8 Fan control
- 3.9 Multifunctional input, digital input
- 3.10 Handling faults
- 3.11 KNX communications
- 3.11.1 S-mode
- 3.11.2 LTE mode
- 3.11.3 Zone addressing in LTE mode (in conjunction with Synco)
- 3.11.4 Example of heating and cooling demand zone
- 3.11.5 Send heartbeat and receive timeout
- 3.11.6 Startup
- 3.11.7 Heating and cooling demand
- 3.11.8 Fault function on KNX
- 3.11.9 KNX switching groups (RDF301.50, RDF301.50H only)
- 3.12 Communication objects (S-mode)
- 3.13 Communication objects (LTE-mode)
- 3.14 Control parameters
- 4. Handling
- 5. Supported KNX tools
- 6. Connection
- 7. Mechanical design
- 8. Technical data
3.11 KNX communications
The RDF KNX thermostats support communications as per the KNX specification.
S-mode Standard mode; engineering via group addresses.
LTE mode Logical Tag Extended mode, for easy engineering,
is used in conjunction with Synco.
3.11.1 S-mode
This mode corresponds to KNX communications.
Connections are established via ETS by assigning communication objects to group
addresses.
3.11.2 LTE mode
LTE mode was specifically designed to simplify engineering. Unlike with S-mode,
there is no need to create the individual connections (group addresses) in the tool.
The devices autonomously establish connections.
To make this possible, the following circumstances are predefined:
• Every device or subdevice is located within a zone
• Every data point (input or output) is assigned to a zone
• Every data point (input or output) has a precisely defined "name".
Whenever an output and an input with the same "name" are located in the same
zone, a connection is established automatically, as shown in the following diagram.
RDF / RDG
Chiller
Sensor
Outside temperature zone 31
Refr. distr zone 1
Geogr. zone 2.5.1
Heat distr zone 1
Cool demand
Outside temperature
Outside temperature
Cool demand
Outside temperature zone 31
Refr. distr zone 1
Heat demand
Time Switch
Operating mode Operating mode
Boiler
Heat distr zone 1
Heat demand
Geogr. zone 2.5.1 or 2.1.1
Room temperature
Definitions
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Siemens RDF301, RDF301.50..., RDF600KN Basic documentation CE1P3171en
Building Technologies Functions 2014-05-23