Siemens SIMATIC ET 200AL System Manual page 1320

PROFIBUS address
Unique identification of a device connected to PROFIBUS. The PROFIBUS address is
transmitted in the frame for addressing a device. A PC or programming device has the
PROFIBUS address "0". DP masters and DP slaves have a PROFIBUS address in the range
from 1 to 125.
PROFIBUS device
A PROFIBUS device has at least one PROFIBUS interface with an electrical (RS 485) or
optical (Polymer Optical Fiber, POF) interface.
PROFIBUS DP
A PROFIBUS with DP protocol that complies with EN 50170. DP stands for distributed I/O
(fast, real-time capable, cyclic data exchange). From the perspective of the user program,
the distributed I/Os are addressed in exactly the same way as the centralized I/Os.
PROFINET
Open component-based industrial communication system based on Ethernet for distributed
automation systems. Communication technology promoted by the PROFIBUS Users
Organization.
RS 485
Asynchronous data transmission process for PROFIBUS DP to ANSI TIA/EIA-RS485-A.
RS 485 repeater
Equipment for amplifying bus signals and for coupling segments over long distances.
Segment
The bus line between two terminating resistors forms a bus segment.
A bus segment can contain up to 32 bus nodes. Segments can be coupled, for example, by
means of RS 485 repeaters or diagnostics repeaters.
Slave
Distributed device in a fieldbus system that may exchange data with a master after being
requested to do so by the master. Slaves are all DP slaves, for example, such asET 200SP,
ET 200MP, ET 200AL.
PROFIBUS with STEP 7 V13
Function Manual, 12/2014, A5E03775446-AC
Glossary
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