Siemens SIPART PS2 Series Operating Instructions Manual page 330

Glossary
Parameter assignment
Individual parameter settings are specifically changed to adjust the positioner as per the
actuator or other requirements. Parameter assignment is carried out after the complete
commissioning of the positioner.
Piezoelectric effect
Name of a physical phenomenon. Due to mechanical compression loads on a crystal, an
electric potential develops on specific crystal surfaces. In a reverse case, applying an electric
field to specific crystal surfaces leads to crystal deformation.
Potentially explosive atmosphere
Mixture of air, combustible gases, fluff, fibers or dusts.
Pressure chamber
The pneumatic actuators are available in single and double-acting versions. In a single-acting
version, only one pressure chamber is pressurized and depressurized. The pressure
developed works against a spring. In a double-acting version, two pressure chambers work
against each other. Pressurizing the volume of one chamber simultaneously depressurizes the
volume of the other.
Process Device Manager
PDM is a Siemens software package for configuration, parameter assignment, commissioning
and maintenance of network configurations and field devices. Part of SIMATIC STEP 7. Used
for configuration and diagnostics.
Protection level
● ia: Protection level. Electric equipment operating fault-free, and with existence of two
countable errors.
● ib: Protection level. Electric equipment operating fault-free, and with existence of one
countable error.
● ic: Protection level. Electrical equipment is not able to cause an ignition when operating fault-
free.
Protocols
Protocols contain information about data formats, time sequences and error handling when
exchanging data between computers.
A protocol is a convention about establishing, monitoring and terminating a connection.
Different protocols are required for a data connection. Protocols can be assigned to every layer
of the reference model. Transport protocols are used for the lower four layers of the reference
model and higher protocols are used for control, data provision and application.
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SIPART PS2 with 4 to 20 mA/HART
Operating Instructions, 11/2019, A5E00074631-AE