Fire Detection System Planning Guide

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Limitations of C-Bus participants

Siemens Building Technologies 007836_a_en_--.doc

Fire & Security Products 03.2004

8.1.5 Maximum number of I-Bus-modules

Table 'Maximum number of I-Bus-modules'

Station type FC700A

I-Bus modules ... 16 1) ... 8 2) 3)

1) Limited by software

2) Value based on experience (depends on cabinet size and/or 5V current consumption)

3) Battery charging unit E3C011 counts as one I-Bus module

8.1.6 Limits of 5V supply

All I-Bus modules are supplied with 24V and 5V. The available current for the 5V,

supplied from main CPU is limited:

'Main CPU' Available current

B3Q700 / E3C011 250mA

Table '5V-Current consumption of I-Bus modules'

I-Bus module

Current consumption

from 'Main CPU'

I-Bus module

Current consumption

from 'Main CPU'

E3M080 55mA E3G060 10mA

E3M111 25mA E3G070 10mA

E3L020 10mA E3C011 12mA

E3L030 35mA E3I020* 100mA

E3G050 8mA E3I040 70mA

* Not an I-Bus module, but supplied via the 'Main CPU'

8.2 Control terminal limits (FC/FT)

8.2.1 Limitation of visible texts on a FC700A

The number of texts of other stations (i.e. AREAS) that can be displayed on one

control terminal is limited by 14'000 texts.

To evaluate how many control panels FC700A can be displayed to one FC700A,

the following calculation must be used:

Twice the number of visible sections (worst case 1000)

+ The number of visible ZONES (worst case 1000)

+ The number of visible ELEMENTS with element text (worst case 1000)

= Number of texts per FC/FT (worst case 4000)

Example (worst case)

14'000 : 4000 (e.g.) = 3 fully configured FC can be displayed to one FC

8.2.2 Limitation of visible texts on a FT700A

The number of texts of other stations (FC700A) that can be displayed on one con-

trol terminal is limited by 14'000 texts.

To evaluate how many control panels FC700A can be displayed to one FT700A,