Profibus-Pa - Burkert 8642 Instructions De Service

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2.1 I/O Box Type 8642 with PROFIBUS-PA Circuit
• Driven by a PROFIBUS-PA
• De-central unit for efficient collaboration with a central automation equipment
(e.g., process control system)
• High process security due to bi-directional transmission of signals
- switching commands from process control system to valve
- sensor signals for registration of the valve position of the process valve.
• The unit can be operated with the new PROFIBUS-DP communication for
cyclic and acyclic operation. The process values are driven via the cyclic data
traffic, e.g. by a PLC. The configuration is carried out from an operator unit
via the acyclic data traffic. With regard to the parameters for the configuration
and the process data traffic, the "PROFIBUS-PA Profile for Process Control
Devices " applies. The obligatory and optional parameters which are available
in the unit are defined in this document. The profile documentation can be
obtained from the PNO (PROFIBUS Utilisation Organisation).
2.2

PROFIBUS-PA

The PROFIBUS-PA connects the automation system and the process control
system with the de-central field units. It uses the extended PROFIBUS-DP
protocol in connection with the transmission technology according to IEC 1158-2.
PROFIBUS-PA fulfils the special requirements of traffic technology, e.g., for the
chemical and petrochemical areas:
Uniform application profile for process automation and complete inter-
•
operability between various PROFIBUS-PA devices.
Connection of the process automation with the PROFIBUS-PA to the general
•
automation via the PROFIBUS-DP using the transmission technology to EIA
RS 485 or optical waveguides
Remote supply and data transmission in two-wire technique with PROFIBUS-
•
PA
Use of PROFIBUS-PA within areas with danger of explosion with explosive
•
protection class Inherent Safety through application of transmission
technology to IEC 1158-2
Simple linking of the PROFIBUS-DP and PROFIBUS-PA bus segments by
•
means of segment couplers
56 I/O-Box Type 8642 Id. Nr. 142 791