Burkert Type 8642 - Manual (Page 9)

8642/142 791 - 7
english
• 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).
2.1 I/O Box Type 8642 with PROFIBUS-PA Circuit
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