If more than 15 lines are needed then each area (again up to 15) can be linked to a Backbone Area,
In an installation this often takes the form of distribution board on each floor feeding all keypads sensors and control devices with a main line linking each distribution board.Īlternatively, a line from each floor could go back to a central distribution point where they would each link to a main line. It is important to label the cable clearly if this method is used.Ī KNX device can be a maximum of 350m from a power supply, which would normally be mounted in a distribution board and the maximum length of bus cable used in a single line is 1000m.Ī single KNX line can have up to 256 devices although the actual number depends on the size of the KNX power supply on the line and the total current of the devices. To expand the system beyond a single line, a hierarchy approach is used with each line (up to 15) linking to a main line to create an area. This provides a back up if the cable is damaged or if the line needs to be expanded.
As such, in Loxone, I have a memory flag that allows me to trigger an actor, and a memory flag that allows me to see if a light is on/off. It is advised to daisy chain from point to point as it makes fault finding and maintenance easier. It is also common to run the cable around the building or floor in a loop but only terminate one end. First off: in KNX, I have a message that allows me to trigger an actor, and there is a sensor that tells me the current status of an actor. When running around a building it can be installed as a daisy chain or star wired and it is possible to create a spur. The only restriction is a loop cannot be created at any point of the bus. In fact, it is usually much easier to do so as it can be run at the same time by the site electrician. KNX cable is mains rated and due to the arrangement of the internal cores, it can be run directly next to mains cabling. Physical Wiring and Installation Topology There are two aspects to consider when it comes to wiring:
0 kommentar(er)
