ILX56-PBS
PROFIBUS DP
ControlLogix® Platform
User Manual
Page 65 of 87
7. PROFIBUS DP
Introduction
PROFIBUS is a vendor-independent, open Fieldbus standard for a wide range of applications
in manufacturing, process and building automation. Vendor independence and openness are
guaranteed by the PROFIBUS standard EN 50 170. With PROFIBUS, devices of different
manufacturers can communicate without special interface adjustments. PROFIBUS can be
used for both high-speed time critical data transmission and extensive complex
communication tasks. The PROFIBUS family consists of three compatible versions.
PROFIBUS DP
Optimized for high speed and inexpensive hookup, this PROFIBUS version is designed
especially for communication between automation control systems and distributed I/O at the
device level. PROFIBUS-DP can be used to replace parallel signal transmission with 24 V or
4-20 mA.
OSI Layer
PROFIBUS
7
Application
DPV0
DPV1
DPV2
6
Presentation
5
Session
4
Transport
3
Network
2
Data Link
FDL
1
Physical
EIA-485
Optical
MBP
Table 9.1
– PROFIBUS Protocol (OSI model)
To utilize these functions, various service levels of the DP protocol were defined:
DP-V0 provides the basic functionality of DP, including
o
cyclic data exchange,
o
station, module and channel-specific diagnostics
DP-V1 contains enhancements geared towards process automation, in
particular
o
acyclic data communication for parameter assignment
o
alarm handling
•
DP-V2 for isochronous mode and data exchange broadcast (slave-to-slave
communication)
PROFIBUS PA
PROFIBUS PA is designed especially for process automation. It permits sensors and
actuators to be connected on one common bus line through a dedicated DP/PA gateway or
link between the PROFIBUS DP and PROFIBUS PA networks, even in intrinsically-safe areas.
PROFIBUS PA permits data communication and power over the bus using a 2-wire technology
according to the international standard IEC 1158-2.
