Siemens FDCL221 Technical Manual page 19

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Rules for the branching of a sub-stub from a loop
● Only one sub-stub is permitted between two FDnet/C-NET devices.
● One sub-stub is permitted at the start and end of the loop respectively,
between the connection terminals of the fire control panel and the first line
device.
● If there is more than one stub between two FDnet/C-NET devices, a line
separator must be fitted between the stubs.
The following figures show the common variants of a modernized detector line on
which the FDnet/C-NET devices (T) are installed with integrated line separation
function. The outgoing stub lines A to D are connected to the FDCL221 line
separators via terminal blocks or micro terminals (X).
Figure 5: Housing FDCL221 line separator in intermediate distributors
1 Intermediate distributor
2 FDnet/C-NET loop
3 Line separator FDCL221
A Sub-stub A
B Sub-stub B
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C Sub-stub C
D Sub-stub D
T FDnet/C-NET device
X Terminal blocks or micro terminals
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