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53.FSTI
54.FSVL
55.STNR
56.IDENT
SIPART PS2 PA Manual
A5E00127926--05
Three settings are possible
FSVL
S
the actuator must continue to control with the parameterized safety
setpoint. This value will remain effective even after a loss of
electrical power.
FSSP
S
the actuator must continue to control with the last effective setpoint
FSAC (factory setting)
S
here this outlet air valve is opened and the single--acting actuator
moves to its final position by spring power.
Monitoring time for moving to the safety position
If communications are lost, the positioner will move to the safety
position after expiry of the set period of time.
Safety setpoint
Specification for the safety setpoint
Note that the fail safe value FSVL of 0 % always refers to the
mechanical position taken up when the actuator is depressurized. This
is particularly important if the parameter SDIR is set to FALL (falling
characteristic of the setpoint) and then at 0% setpoint 100 %
mechanical position is expected.
Station number
So that the devices on the bus can be addressed separately, a
separate station number must be set on each device.
Device operating mode
The SIPART PS2 PA positioner recognizes two device operating
modes for its behavior in relation to DP masters class1:
[0] profile conformity: exchangeable for positioners from other suppliers
to PROFIBUS PA profile 3.0
[1] profile conformity with extensions: full scope of function of SIPART
PS2 PA (condition as delivered)
Operation
111
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