PLX51-PBM PROFIBUS DP
PROFIBUS DPV0/DPV1 Master or Slave to EtherNet/IP™ or Modbus® Gateway User Manual
ProSoft Technology, Inc. Page 189 of 196
10 PROFIBUS DP
10.1 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.
10.1.1 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.
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)
10.1.2 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.
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