Functional safety
8.1 General safety notes
SIPART PS2 with PROFIBUS communication
108
Operating Instructions, 09/2007, A5E00127926-07
3RVLWLRQHU
3QHXPDWLFDFWXDWRU
&RQWUROYDOYH
)LQDOFRQWUROOLQJHOHPHQW
6KXWRIIVLJQDO
9
)DXOWSURWHFWHG636
'2
$,
6HQVRU
7UDQVPLWWHU
352),%863$
6,6
352),%860DVWHU
Figure 8-1
Example of a safety-instrumented system (SIS)
Function
The transmitter generates a process-specific measured value. The programmable controls
(SPS) monitors this value in case it exceeds a preset limit value. If a fault occurs, the SPS
generates a shut-off signal for the connected positioner. The positioner switches the
corresponding valve to the specified safety position. The communication with the positioner
via PROFIBUS PA or FOUNDATION field bus remains unrestricted, i.e. position and status
signals are still possible.
