SIEMENS S7-200 driver

Product Overview

The Siemens S7-200 driver works in conjunction with KEPServerEX to exchange data between OPC clients and Siemens S7-200 PLCs using the PPI (11 bit) or PPM (10 bit) protocol. It includes direct support for the EM241 Modem Module. KEPServerEX automatically optimizes data acquisition based on client demand and ensures data integrity through extensive error handling.


  • Supports the EM241 Modem Module
  • Supports the PPI (11 bit) and PPM (10 bit) protocols
  • Supports Single Master Multi-drop RS485
  • Supports Stations 0-126
  • Supports Communication Serialization
  • Supports the following Memory Types: I, Q, M, S, V, T, C, HC, AI, and AQ
  • Supports all data types
  • Modem Support
    • Automatic dial configuration
    • Multiple phone number management

SIEMENS S7-200 driver


The Siemens S7-200 Driver normally operates using the standard 11 bit PPI protocol. If the EM 241 modem module is required, the S7-200 PPM model must be selected. This model allows the driver to operate in a 10 bit mode that is compatible with many off-the-shelf modems. The 10 bit PPM mode can also be used directly on the PLC’s programming port. To enable 10 bit PPM mode, set the S7-200 programming cable to 10 bit mode.

Data Types Description

Data TypeDescription
BooleanSingle bit of a 16 bit value.*
ByteUnsigned 8 bit value.
bit 0 is the low bit
bit 7 is the high bit
WordUnsigned 16 bit value.
bit 0 is the low bit
bit 15 is the high bit
ShortSigned 16 bit value.
bit 0 is the low bit
bit 14 is the high bit
bit 15 is the sign bit
DWordUnsigned 32 bit value.
bit 0 is the low bit
bit 31 is the high bit
LongSigned 32 bit value.
bit 0 is the low bit
bit 30 is the high bit
bit 31 is the sign bit
Float32 bit floating point value.
The driver interprets two consecutive registers as a floating-point
value by making the second register the high word and the first register
the low word.
StringNull terminated ASCII string

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