Glossary
ET 200eco PN
268 Operating Instructions, 08/2016, A5E01250250-AJ
Protective Extra Low Voltage = extra low voltage with safe isolation
Prioritized startup (FSU) denotes PROFINET functionality for accelerating the startup of IO
Devices for RT and IRT communication within a PROFINET IO system.
The functions reduce the time that the correspondingly configured IO Devices require to
recover the cyclic exchange of user data in the following situations:
● After power has returned
● After station recovery
● After activation of IO Devices
The CPU transfers the values from the input and output modules to this memory area. At the
beginning of the cyclic program, the signal states of the input modules are transferred to the
process input image. At the end of the cyclic program the process image of the outputs is
transferred as a signal state to the output modules.
PROcess FIeld BUS, process- and fieldbus standard, which is defined in the standard
IEC 61158 Type 3. It specifies functional, electrical and mechanical properties for a bit-serial
fieldbus system.
PROFIBUS is available with the protocols DP (= Distributed Peripherals), FMS (= Fieldbus
Message Specification), PA (= Process Automation), or TF (= Technological Functions).
Technical committee dedicated to the definition and development of the PROFIBUS and
PROFINET standard.
Also known as the PROFIBUS Trade Organization (PTO).
Homepage: www.profibus.com
Within the framework of Totally Integrated Automation (TIA), PROFINET represents a
consequent enhancement of:
● PROFIBUS DP, the established field bus, and
● Industrial Ethernet, the communication bus for the cell level.
Experience gained from both systems was and is being integrated into PROFINET.
PROFINET is an Ethernet-based automation standard of PROFIBUS International
(previously PROFIBUS Trade Organization) and defines a multi-vendor communication,
automation and engineering model. Since 2003, PROFINET has been part of IEC 61158.
See PROFIBUS International
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