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Figure 10-3 PFD distribution
The following table shows the achievable Safety Integrity Level (SIL) for the entire safety-
instrumented system for type A devices depending on the safe failure fraction (SFF) and the
hardware fault tolerance (HFT).
● Type A devices include analog transmitters and shut-off valves without complex
components, e.g. microprocessors (see also IEC 61508, Section 2).
● The specific values for your device are listed in the manufacturer's declaration (SIL
Declaration of Conformity, Functional Safety according to IEC 61508 and IEC 61511):
Certificates (http://www.siemens.com/processinstrumentation/certificates).
SFF HFT for type A devices
0 1 2
< 60% SIL 1 SIL 2 SIL 3
60 to 90 % SIL 2 SIL 3 SIL 4
90 to 99 % SIL 3 SIL 4 SIL 4
> 99% SIL 3 SIL 4 SIL 4
10.4 Settings
WARNING
Safety function: Positioning "Jumper" on the basic electronics
The safety function is not activated in the delivered state; the "Jumper" is in the "Normal"
position. "Normal" means: Without safety function, no depressurizing of the connected
actuator. To activate the safety function, proceed as follows:
● Insert the "Jumper" in the left position facing the terminals. This corresponds to the position
"Shut Down enabled" on the wiring diagram present on the module cover, see "Figure 3-6
View of the positioner (cover open; polycarbonate enclosure) (Page 28)".
Or
● Remove the "Jumper" from the basic electronics.
Special parameter settings are not necessary.
Protection against configuration changes
You should attach the housing cover so that the device is protected against unwanted and
unauthorized changes/operation.
Functional safety
10.4 Settings
SIPART PS2 with PROFIBUS PA
238 Operating Instructions, 05/2019, A5E00127926-AC
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