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9.2.7 Functional allocation
In the ↑ 'Control tree', a function is assigned to a device from the 'Hardware tree',
for example a monitoring function (cause) is assigned to an input or a control
function (effect) is assigned to an output.
In the 'Control tree', the function of a logical element from the ↑ 'Detection tree' is
evaluated (cause) or controlled (effect). For example, the alarm condition of the
'Zone' is evaluated or the 'Zone' is switched on or off.
The figure below shows the interrelations of the aforementioned structures by way
of example.
Figure 16: Example of functional assignment
D ↑ 'Detection tree'
C ↑ 'Control tree'
L ↑ Link
HW 'Hardware tree'
a - e Control groups
f
Controls
X E.g., ↑ switching off, commands to other parts of the site
L ↑ Local alarming
↑ Alarming equipment (e.g., acoustic or optical alarm devices) is actuated in order to call up
immediately available intervention personnel (e.g., in-house staff) and to alert people of a possible fire
hazard.
G ↑ Global alarming
Alarming equipment (e.g. remote transmission) is actuated and external intervention forces (e.g. the
fire brigade) are alerted.
Visualization of the link from causes and effects via controls
Lines Signal transfer or logical link
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