English
The CIB is a two-wire bus with free topology. The communication itself is modulated on DC supply voltage. Powering the bus is provided by a standard 27.2 VDC or 24 VDC source connected to the bus via internal separation circuits (CP-1000, CF-1141) or an external decoupling module C-BS-0001M. The power supply can also be used for powering the Foxtrot system.
In addition to data transfer, the bus facilitates powering the connected modules (units); however, maximum consumption of all powered units and maximum drops of supply voltage must be considered, so that all parts of the bus would comply with the conditions of the supply voltage tolerance.
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Nominal voltage of the bus power supply (with a backup) |
27.2 VDC |
+ 10 %, - 25 % |
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Nominal voltage of the bus power supply (without a backup) |
24 VDC |
+ 25 %, - 15 % |
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Topology |
free |
|
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Maximum distance of the master to the farthest unit 1) |
about 500 m |
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1) Maximum length of the entire installation of one branch is mainly limited by the voltage drops in the bus cable. Even the farthest unit supply voltage must be within the permissible tolerance.
Any two-wire cables can be used for the installation of the CIB.
We recommend using cables with shielded twisted pair and with the wire diameter at least 0.6 mm, preferably 0.8 mm (the wire resistance approx. 7 Ω/100m), e.g. the J-Y(St)Y1x2x0,8, YCYM 2x2x0,8.
The wire cross-section and topology must be selected primarily with respect to voltage drops in the cables - in accordance with the number and type of installed CFox modules.
Basic rules for the CIB installation:
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The CIB allows almost any installation topology (a line, a star, a tree), except for a circle!
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It is recommended not to lay cables side by side with power cables (230 VAC) – depending on the specific possibilities of implementation; there are no other special requirements for the placement of the cables.
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In larger installations, it is necessary to calculate the supply voltage drops in the cables: in all locations of the installation the minimum CIB power supply must be guaranteed.
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During the installation it is necessary to take into account the galvanic connection of input and output circuits of all bus components - except for low-voltage circuits (relay outputs, dimmers, ripple control inputs, etc.)– they are always galvanically isolated (safe isolation of circuits).
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The CIB must always be designed and implemented to meet the SELV or PELV requirements.
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Incorrect shielding of the CIB cable must be avoided.