Glossary
Glossary-6
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
PROFIBUS-PA
PA stands for process automation and extends the scope of the PROFIBUS-DP
family to include process engineering. Process engineering includes both
intrinsically safe applications in the chemical engineering industry as well as
non-intrinsically safe applications such as power plant automation, food
processing and sewage treatment.
Redundant systems
Redundant systems are characterized by the fact that important automation
components are duplicated (redundant). If a redundant component fails, there is
no interruption in the program processing.
Reference potential
The potential with respect to which the voltages of the circuits involved are
viewed and/or measured.
Segment
A segment or bus segment is a self-contained part of a serial bus system.
SELV
Safety extra-low voltage (SELV) is voltage v 30 VAC/60 VDC generated by
means of a safety isolating transformer, battery, etc.
SIMATIC PDM
SIMATIC PDM (Process Device Manager) is a universal tool that is not
manufacturer-specific and is used for configuring, parameterizing, commissioning
and diagnosing intelligent process devices. With SIMATIC PDM, a large variety
of process devices can be configured with a single software on a standardized
user interface.
Supply unit
A supply unit supplies power to the line.
Terminating resistor
A terminating resistor is a resistor that terminates the data transmission line to
avoid reflections.
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