2 transparent access using a plc, Transparent access using a plc, Driveserver – Lenze DriveServer Erste Schritte Benutzerhandbuch
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DriveServer
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DriveServer DE/EN 1.1
7.2
Transparent access using a PLC
Fieldbus systems with one master only are often used with a PLC. It is then not possible to have a direct
connection to the fieldbus.
The following figure shows a system architecture with a Simatic S7 control made by Siemens as PLC.
MPI
PROFIBUS DP
•
The drives are connected to the PLC via PROFIBUS-DP.
•
The two PLCs are interconnected via a MPI bus.
•
The PC with the DriveServer is also connected to the MPI bus and uses a bus server for the PLC
(Lenze S7-MPI OPC server) instead of a bus server for the fieldbus system.
•
Special Lenze function modules in the S7 program allow access to the drives from the PC via a
PLC as if the PLC was not connected.
Tip!
More information about the Lenze S7-MPI OPC server can be obtained from the Online documentation
which is part of the delivery.
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