User Manual

6
Siemens Building Technologies
Cerberus Division
e1143b
06.2000
Interactions between Cerberus subsystems and FSS field devices are allowed by the
FHI Pad connection and by the communication between Subsystem Pads and FHI Pad
on the gateway bus. These interactions are automatically triggered by an event or a
sequence of events arising in LMS systems (arrow marked E in Fig. 5.
GW20
FSS
CZ10 CZ12 CS11 CS4
LMS
E
Fig. 5 CZxx managed by FSS
When the status of security/safety device changes, the control panel detects it and
transmits a message to the management station containing information about
§ the device that underwent the change of status;
§ the status it entered as a consequence of the status change, its position and type.
The gateway receives the message and undertakes the following actions, according to
the configuration.
§ it transmits a message to the LMS supervising system (always) - arrow A and re-
ceives commands from LMS - arrow B;
§ it transmits a message to the FSS, through the FHI Pad - arrow C and receives
commands from the FSS - arrow D;
§ If interactions have been configured, it sends commands/information to the FSS to
perform actions on the technological plant - arrow E. The commands for interaction
are issued directly from the CZxx control panel, i.e. they send a message to the FSS
through the Subsystem Pad the CZxx is connected to. Inside the Gateway, the Sub-
system Pad dispatches the message to the FHI Pad that issues the message to the
FSS. That message does not correspond to the change of status of any physical
point installed in the field but it must be interpreted by the FSS as a request to per-
form some actions.
The message received at LMS and FSS monitoring level is treated according to soft-
ware configuration.
The security/safety operator, can observe the event displayed on the screen, and can
acknowledge receipt of the message and can send commands that change the control
panel status. For instance, as a consequence of a fire alarm, he can deactivate part of
the security system and can send commands to technological devices connected to the
FSS. The operator acts on on-screen software objects and the software converts them
into messages, which are sent to the gateway and then to the control panel.
The data flow is similar for a message coming from a technological plant item. The
message is received by the FSS, which sends the message through the FHI Pad to
LMS. The symmetry however is not perfect. The technological plant analog values are
not managed by LMS. Only an FSS operator can change or set up values and display
analog data. The technological plant operator cannot however reset a security/safety