Glossary
ET 200pro distributed I/O system
Operating Instructions, 03/2013, A5E00335544-08
533
Potential group
A group of electronic modules supplied by one power module.
Process image
The process image forms part of system memory in the DP master. At the start of the cyclic
program, the signal states of the input modules are transferred to the process input image
(PII). And the end of the cyclic program, the process output image (POI) is transferred to the
DP slave as signal state.
PROFIBUS
PROcess FIeldBUS; German process and fieldbus standard according to IEC 61784-1:2002
Ed1 CP 3/1. Specifies the functional, electrical and mechanical characteristics of a serial bit
stream fieldbus system.
PROFIBUS is available with the protocols DP (= Distributed Peripherals), FMS (= Fieldbus
Message Specification), PA (= Process Automation), or TF (= Technological Functions).
PROFIBUS address
Each bus device must be assigned a unique PROFIBUS address in order to allow its
identification on PROFIBUS.
PCs/PGs are assigned PROFIBUS address "0".
The ET 200pro distributed I/O system supports the PROFIBUS addresses 1 to 125.
PROFIBUS International
Technical committee dedicated to the definition and development of the PROFIBUS and
PROFINET standard.
Also known as the PROFIBUS User Organization e. V.(PNO).
PROFINET
Within the framework of Totally Integrated Automation (TIA), PROFINET represents a
consequent enhancement of:
●
PROFIBUS DP, the established fieldbus, 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 User Organization e. V), and defines a multi-vendor communication,
automation, and engineering model. PROFINET has been part of the standard IEC 61158
since 2003.
See PROFIBUS International