Communications: Profibus-Dp/-Pa; Profibus-Dp/-Pa Technology; Profibus-Dp System Architecture - Endress+Hauser PROline prosonic flow 93 Operating Instructions Manual

5 Operation
62
5.3

Communications: PROFIBUS-DP/-PA

5.3.1

PROFIBUS-DP/-PA technology

PROFIBUS (Process Fieldbus) is a standardised bus system based on the European
standard EN 50170, Volume 2, which has been successfully used for many years in
production and process automation (chemical industry and process engineering).
The PROFIBUS is a multi-master bus system with high performance, which is
particularly suitable for medium to large plants.
PROFIBUS-DP
PROFIBUS-DP is a MASTER/SLAVE bus system. The master function is handled by an
automation system (Class 1 master) or by one or more personal computers (Class 2
master). Using cyclic data telegrams, the automation system has full access to all of the
bus stations assigned to it. With a personal computer (Class 2 master) you can, if
needed, use acyclic data telegrams to exchange data with all of the connected field
devices.
In accordance with the standard, up to 126 stations can be connected to a
PROFIBUS-DP network. The PROFIBUS-DP can operate at a transmission rate of
9.6 kBit/s...12 MBit/s and, at a transmission rate of 1.5 MBit/s, can support network
expansions of up to 2000 m with copper cables or 21.730 m using optical link modules.
PROFIBUS-PA
PROFIBUS-PA expands the PROFIBUS-DP by using an optimised transmission
technology for field devices while retaining the communication functions of the
PROFIBUS-DP. With the selected transmission technology, field devices can be
connected via the PROFIBUS-PA to the automation system over great distances, even
in hazardous areas. PROFIBUS-PA is the communications compatible extension of
PROFIBUS-DP.
PROFIBUS-PA = PROFIBUS-DP + optimised transmission technology for field devices
5.3.2

PROFIBUS-DP system architecture

3
Fig. 59: PROFIBUS-DP system architecture
1 = Automation system, 2 = Commuwin II operating program,
3 = PROFIBUS-DP RS 485 (max. 12 MBaud)
PROline Prosonic Flow 93 PROFIBUS-DP/-PA
2
1
Endress+Hauser