Description; Function; Structure; Design Overview - Siemens SIPART PS2 Operating Instructions Manual

Description

3.1

Function

● The electropneumatic positioner and an actuator form a control system. The current position
● The control system provides the setpoint w digitally to the positioner over the bus.
● The positioner works as a predictive five-point positioner, through whose output value ±Δy
● These input signals change pressure in the actuator chamber(s) and displace the actuator
● Using the three buttons and the display with the enclosure cover removed, operation
● By default, the basic unit has a binary input (BIN). This binary input can be individually
● It has a friction clutch and a switchable gear so that the positioner can be used with different
● In the case of positioners with the "Fail in Place" function, the current position of the actuator
● Parameter "51.FSTY" must be set to "FSSP" in the case of the "Fail in Place" function if
3.2

Structure

3.2.1

Design overview

The following sections describe the mechanical and electrical structure, components, and
principle functionality of the positioner.
The positioner and the PROFIBUS PA communication interface function as components in a
digital process automation system. It functions as a slave and communicates with the master
through the PROFIBUS PA fieldbus. Apart from communication, the fieldbus also supplies
electrical auxiliary power to the positioner.
SIPART PS2 with PROFIBUS PA
Operating Instructions, 02/2016, A5E00127926-AB
of the actuator is recorded by a servo potentiometer and the actual value x is fed back. The
setpoint and the actual value are also shown simultaneously on the display.
the integrated valves can be controlled by pulse length modulation.
until the control deviation becomes zero.
(manual mode) and configuration (structuring, initialization, and parameter assignment)
can be performed.
configured and used, for example, to block the control levels.
mechanical part-turn and linear actuators.
is held if the electric and/or pneumatic auxiliary power fails. Does not function in conjunction
with SIL.
the current position is to be held when switching on again following failure of the electric
auxiliary power.
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