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C-Bus™ Basic Programming 1250SM0904R10/09

C-Bus™ Products Training Course 10/2009

C-Bus Units

There are three critical things to consider with regards to C-Bus units, they

are:

 Maximum Number Of Units

 Maximum Number Of Particular Unit Types

 C-Bus Unit Positioning.

Maximum Number Of Units

The maximum number of C-Bus units that can be installed onto a single

C-Bus network is 100. However this number may decrease depending on:

 The types of units connected to the C-Bus network

 The current draw of all the C-Bus units on the network.

Maximum Number Of Particular Unit Types

Some C-Bus units have a limitation whereby there cannot be more than a

certain number installed onto a single network. Some of the units that have

this limitation are listed in the table below. This is a limitation of the specific

C-Bus units.

C-Bus Unit Type Maximum Number Of Units

DLT Switches 50

Saturn Switches 50

Infrared Transmitter 50

Table 14 - Maximum number of unit types on a C-Bus network

NOTE: See the product’s Installation Instructions for further details.

C-Bus Unit Positioning

When installing C-Bus output units and System Support Devices, the

following points should be considered:

 Is there appropriately located to allow access to the units and limit

tampering?

 Is the area well ventilated?

 Is audible noise a problem (eg relays clicking, dimmers humming)?

 Is the unit positioned in areas of appropriate temperature and humidity?

 Is there anything that may cause electrical interference on C-Bus?

 Are IR Transmitters positioned near the equipment that they are

controlling?

 Are all DIN Rail output units mounted horizontally?

When installing C-Bus input units, the following questions should be

considered:

 Will the C-Bus unit be exposed to any unwanted moisture or humidity?

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