Line Separation Function - Siemens FDUL221 Technical Manual

4.2 Line separation function

Building Technologies
Fire Safety
All FDnet/C-NET devices have an integrated line separator.
It has two functions:
Short-circuit and open line monitoring
Allows branching of stubs between two FDnet/C-NET devices
Short-circuit monitoring
In the case of a short-circuit on the detector line, the line separator automatically
isolates the faulty line section. This is to ensure that, in the case of a short-circuit,
only the faulty line section fails, not the complete detector line.
Open line
If the detector line is a loop, no line devices fail in the case of open line.
Branching off from a stub
Only one stub is permitted between two FDnet/C-NET devices.
If there is more than one stub between two FDnet/C-NET devices, a line
separator must be fitted between the stubs.
Use of line separators on a loop
Introduction
Line separation function
008250_i_en_--
2013-08-15
4
19