User Manual

15-2
Siemens Switzerland Ltd www.siemens.com/gamma 2019
Building Technologies Division
Technical Information and Application Examples
Technical Information
System overview
Building Control GAMMA instabus – future proof
installation system based on KNX
GAMMA instabus is an event-oriented, distributed control installation
system based on KNX, the worldwide standard for home and building
control. KNX is approved as an International Standard
(ISO/IEC 14543-3), as a European Standard (CENELEC EN 50090 and
CEN EN 13321-1) and as a Chinese Standard (GB/T 20965). Hence,
KNX is future-proof.KNX products of different vendors can be com-
bined - the KNX logo guarantees networking and interworking. KNX
is the only world-wide open standard for control of residential and
non-residential including industrial buildings. With the consistent bus
system KNX control information (from command senders) is sent to
all building control components. The actuators (command recipients)
receive these commands via the KNX bus line and act accordingly.
Installation system with KNX
Actuators (receiver)
Sensors (transmitter)
Lighting Solar protection Heating Ventilaton Air-Conditioning
Operation Room climate Conditions Presence
KNX
AC 230/400 V
Examples of application with KNX:
• Lighting
• Solar protection
• Heating, including demand driven control of primary system
• Ventilation
• Air conditioning
• Display and operation
• Room climate to measure CO
2
, air quality and air humidity
• Evaluation of weather data such as wind force, solar radiation, day
and night time
• Presence in a room
In residential and non-residential buildings, KNX integrates many buil-
ding functions which used to be realized with separated systems until
now. The demand for comfort in rooms increases and can be realized
with daytime and presence dependent air conditioning and lighting.
Furthermore, the efficient use of energy is getting more and more
important. An intelligent monitoring and control of all products implies
the wiring of all sensors und actuators with the central supervisory
monitoring and control system. The conventional wiring leads to cable
loads and to higher planning and installation efforts, fire risk and rapid-
ly increasing costs. Using the intelligent networking of all bus devices
via KNX bus wiring, the wiring and thus the fire load is reduced. The
mains power is directly wired to the loads and with the decentralized
actuators being close to the load the power wiring can be run from one
load to another load. The sensors are connected via the bus line. The
KNX system is designed for integrating several disciplines i.e., using a
multi pushbutton user control the lighting can be controlled, the solar
protection moved and the ventilation can be turned on and off.
An installation on basis KNX offers the following advantages:
• Installation of a future-proof system technology
• Reduction of wiring
• Fast and easy retrofitting of additional functions
• Cross-discipline usage of products from several different vendors is
possible
• Reduction of power demand and operating costs
• Reduced costs for later changes in room usage and changes of the
original room setup (change of configuration versus change of
installation)
• Remote maintenance and surveillance via IP network connection for
distributed facilities
System design
KNX is an upwards-compatible, flexible, and innovative system for
various residential and non-residential building applications. The bus
wiring KNX TP (Twisted Pair), but also Ethernet KNXnet/IP, Radio
System KNX RF (Radio frequency) and Infrared can be used as trans-
mission medium. Thus KNX helps to implement specific customer
requests and perform a fast and easy change in use of rooms and
buildings.
KNX TP (Twisted Pair)
The signal transmission of KNX TP (Twisted Pair) happens via the certi-
fied bus wire. Using this wiring as the transfer medium assures a high
resistance to interference.
KNXnet/IP (Ethernet)
Information transmission with KNXnet/IP is done using the Internet
Protocol (IP). It allows using the existing network infrastructure (LAN).
Coupling between KNX and the local area network (LAN) is done
via KNXnet/IP interfaces. This allows for coupling of complete KNX
installations between buildings and the remote access via Internet/In-
tranet. Secure transmission of data is ensured using standard security
mechanisms of the network components.
KNX RF (radio frequency)
KNX device supporting this communication medium uses radio fre-
quency (RF) to transmit KNX telegrams. These are transmitted on the
868 MHz frequency band.
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