Siemens SIMATIC ET 200AL - Page 938

Glossary
Communication
252 Function Manual, 12/2017, A5E03735815-AF
Process image
Address area of a programmable logic controller (PLC), in which the signal states of the
inputs and the logical states of the outputs from the connected modules are stored digitally.
PROFIBUS
Pro
cess
Fi
eld
Bus
- European Fieldbus standard.
PROFIBUS address
Unique identifier of a device connected to PROFIBUS. The PROFIBUS address is sent in
the frame to address a device.
PROFIBUS device
Device with at least one PROFIBUS interface either electrical (for example RS-485) or
optical (for example Polymer Optical Fiber).
PROFIBUS user organization
Technical committee dedicated to the definition and development of the PROFIBUS and
PROFINET standard.
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/O is addressed in exactly the same way as the centralized IO.
PROFINET
Open component-based industrial communications system based on Ethernet for distributed
automation systems. Communications technology promoted by the PROFIBUS user
organization.
PROFINET device
Device that always has a PROFINET interface (electrical, optical, wireless).
PROFINET interface
Interface of a module capable of communication (for example CPU, CP) with one or more
ports. A MAC address is assigned to the interface in the factory. Along with the IP address
and the device name (from the individual configuration), this interface address ensures that
the PROFINET device is identified uniquely in the network. The interface can be electrical,
optical or wireless.