Siemens SIGMASYS C, Manual

Page: 99 / 138

12 Monitored lines
Figure 18: Additional signal bases and alarm sounders allowed for a given load factor
Warning:
The table applies only to short line lengths:
For cables with 0.6mm
∅
< 625m
For cables with 0.8mm
∅
< 1125m
Example: With 100 existing load factors and a maximum permitted load factor of 280, another
11 alarm sounders can be installed, or 3 alarm sounders and 21 signal bases (including de-
tectors).
T-taps :
A T-tap can be up to 2.5 km long.
The maximum line length is limited by the capacity of all lines in an FDnet
T-tap and LOOP. (330nF shielded 500nF unshielded).
Each FDnet has a limit of 280 load factors with any distribution over loop or T-tap.
The longer the line lengths in the loop, the fewer load factors can be connected.
The following diagram shows the maximum load factors that can be connected for an FDnet
(idle load f additional load factors in alarm state) in relation to the cable length and
line diameter. The diagram applies to both shielded and unshielded cable.
Multifunctional Danger Control and Indicating Panels SIGMASYS C and M (M-Modules) 91 / 128
Best.Nr. A24205-A337-B970 – Edition 12 (03/07)