Siemens S7 MPI

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Product Overview

The Siemens S7 MPI driver works in conjunction with KEPServerEX to exchange data between OPC clients and Siemens S7-300 and S7-400 PLCs using the MPI protocol. The MPI interface requires the use of the Siemens S7 MPI serial port adapter available from your Siemens dealer. The serial port MPI adapter allows KEPServerEX to communicate with Siemens S7-300 and S7-400 PLCs at either 19.2 KBaud or 38.4 KBaud. The driver talks directly to the MPI adapter cable without additional software packages or libraries. KEPServerEX automatically optimizes data acquisition based on client demand and ensures data integrity through extensive error handling.



  • Supports Ethernet Encapsulation
  • Supports multiple Master Multi-drop
  • Automatically handles network configuration
  • Supports Stations 0-126
  • Supports the following Memory Types: I, E, Q, A, M, F, T, C, Z, and Data Block Access
  • Supports bit-level access
  • Supports all data types
  • Supports arrays for byte, char, word, short, DWORD, long, float and LBCD data types
  • Modem Support
    • Automatic dial configuration
    • Multiple phone number management


  • Multi Point Interface (MPI) S7-300/400 Communications Protocol

Supported Devices

  • S7-300 - Family
  • S7-400 - Family

Available Languages

  • English
  • German
  • Japanese
  • Simplified Chinese

Application Support

  • DDE Format CF_Text and AdvancedDDE
  • NIO Interface for iFIX
  • OPC .NET Service (OPC .NET) Version 1.00
  • OPC Alarms and Events (OPC AE) Version 1.10
  • OPC Data Access (OPC DA) Versions 1.0a, 2.0, 2.05a, and 3.0
  • OPC Unified Architecture (OPC UA) Clients
  • SuiteLink and FastDDE for Wonderware

Release Notes



  • Added Chinese language support.



  • Added German language support.
  • Added Japanese language support.


  • Fixed issue creating tags defined with String data type.