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8
Siemens Building Technologies
Cerberus Division
Fig. 6 shows a less usual configuration, used only in plants in which an high level of re-
dundancy is required. In this configuration, the GW-21.xx gateway acts as an intelligent
line splitter and protocol converter: the signals coming from the subsystem(s) are con-
verted from Cerban to CMSDL protocol and routed toward two supervisor systems. The
GW-20 that receive the messages should be equipped with Net-M Pad. The messages
are treated in a completely independent way by the two supervising systems connected
to the GW-20.
CMS/LMS monitoring system
Fig. 6 The redundant configuration
GW-20
Net-M Pad
CMSL protokol
GW-21
CERBAN protokol
CSxx
CMS/LMS monitoring system
GW-20
Net-M Pad
CMSL protokol
E1481b
06.2000
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