Clipsal C-Bus Spezifikationen PDF herunterladen (Seite 9)

1A. Introduction to C-Bus

1.0 Why Use C-Bus

There are many reasons to use C-Bus:

• it is a highly robust and reliable control system, with a low cost per node

• a wide range of tools is available, allowing third party companies to interface with both PC based

and embedded systems

• a single C-Bus cable connection can control many devices

• C-Bus offers the ultimate exibility in switching and control. Functions can be changed, added,

removed, moved, reprogrammed, at any position on the network, at any time – without any

cumbersome hard-wiring

• C-Bus is simple to install and commission

• C-Bus can control any type of load, digital and analogue.

Electrical wiring practices have not changed much since the introduction of insulated multicore

cabling. However, wiring requirements in commercial buildings have changed rapidly since that

innovation. The additions of ﬁre and smoke detection, security and energy management systems have

placed high demands on electrical installations.

The need for central monitoring and control of these extra systems may result in massive networks of

wires emanating from the control area.

Conventional wiring practice requires current to ﬂow through both a switch and its load. This requires

heavy conductors to run from the switchboard to the load and from the load to the controlling

switches. These aspects add to wiring complexity, increasing installation time, documentation control

and overall system cost. Maintenance and system ﬂexibility can be problematic.

The C-Bus network overcomes these problems. It uses a twisted pair of wires such as Unshielded

Twisted Pair (UTP) Category 5 (Cat-5) Local Area Network (LAN) cable, to communicate between

a building’s light switches and load controlling devices. This same cable pair also provides the d.c.

supply voltage to the C-Bus devices.

This greatly reduces the number of heavy wires in an installation, while enabling easy central

monitoring and system control.

C-Bus can be expanded to control and monitor a building’s electrical appliances from a personal

computer. Security, air conditioning and other systems can be programmed to turn on or off at

speciﬁc times or events. Lighting and temperature can be varied according to ambient conditions.

Inputs, switches and loads can be reconﬁgured without reconnecting a single wire.

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Clipsal C-Bus Spezifikationen Seite 9