Glossary
Glossary-5
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Master
Masters may, if they possess a token, send data to other nodes and request data
from other nodes (= active node). DP master are e. g. the CPU 315-2 DP or the
IM 308-C.
Parameter assignment
Parameter assignment is the handing over of slave parameters from the master
to the slave.
PNO
PROFIBUS user organization
Power supply unit
A power supply unit supplies power to the field devices and the process I/Os
connected to them.
PROFIBUS
PROcess FIeld BUS, process and field bus standard that is defined in the field
bus standard (IEC 61784-1:2002 Ed1 CPF 3 PROFIBUS and PROFInet). It
defines functional, electrical and mechanical properties for a bit-serial field bus
system.
PROFIBUS is available with the following protocols: DP (for distributed I/O
systems) and FMS (= Fieldbus Message Specification).
PROFIBUS address
Each bus node must receive a PROFIBUS address that uniquely identifies it on
the PROFIBUS-DP.
The PC/programming device or the hand-held ET 200 have the PROFIBUS
address “0”.
DP master and DP slaves have a PROFIBUS address from 1 to 125.
PROFIBUS-DP
This is the PROFIBUS bus system with the DP protocol. DP stands for
distributed I/O in German.
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