Modbus Plus

See purchasing information for more details
Download Free Demo

Product Overview

The Modbus Plus device driver works in conjunction with KEPServerEX to provide data exchange between OPC clients and Modbus Plus protocol compliant PLCs. KEPServerEX automatically optimizes your data acquisition based on client demand. Data integrity is ensured with our extensive error handling.

Kepware's implementation of the Modbus Plus driver supports master and slave paths simultaneously. The slave mode allows the server to receive data by exception from other Modbus Plus devices. Up to eight simultaneous slave paths are supported for maximum unsolicited message processing throughput.

The Modbus Plus driver now offers direct integration with Modicon Concept and ProWORX programming packages. If you are using either of these packages you will be able to import the tags used in your PLC application directly into KEPServerEX. This time-saving step instantly makes all of the relevant PLC data available to your OPC client applications.



  • Automatic Tag Database Generation
  • Supports tag import from Concept and ProWORX programming packages
  • SA85-PCMCIA (Windows 95 only)
  • Supports up to four SA85 cards in one PC
  • Supports Multiple Access Paths per card
  • Modicon X84 w Modbus Plus features
  • Modicon TIO Remote I/O Modules
  • Supports Memory Accesses to 65535
  • 0xxxx - Output Coils, 1xxxx - Input Coils, 3xxxx - Internal Registers, 4xxxx - Holding Registers
  • Supports accessing Holding Register memory as string data with HiLo/LoHibyte ordering
  • All data types and arrays are supported
  • Order Modicon part # "SW-LNET-INT" or "SW-LNET-I95"


  • Modbus Plus

Supported Devices

  • AT-984 Programmable Controller Board
  • Hilscher CIF Card
  • Modbus Plus ISA PC Adapter Card
  • Modbus Plus PCI PC Adapter Card
  • Modbus Plus Type II PCMCIA Card
  • Modbus Plus Type III PCMCIA Card
  • Modbus Plus Type III PnP PCMCIA Card
  • SA85 (-002 and -001) PC Interface Cards
  • SA85-PCI

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



  • Removed non-inclusive terms out of respect for users of our software.



  • Added Chinese language support.



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



  • Enhanced the driver to support Media Level Redundancy.



Increased the character limit of the tag Description field from 64 to 255.


  • Added string data type support for Internal Registers.
  • Added block string read support.

Supported Device Details

  • Modbus Plus ISA PC Adapter Card - Schneider part#: AM-SA85-030
  • Modbus Plus PCI PC Adapter Card Schneider part#: 416 NHM 300 30
  • Modbus Plus Type II PCMCIA Card - Schneider part#: 416 NHM 212 30
  • Modbus Plus Type III PCMCIA Card - Schneider part#: 416 NHM 212 33
  • Modbus Plus Type III PnP PCMCIA Card - Schneider part#: 416 NHM 212 34
  • Hilscher CIF Card - For this configuration, the driver requires Hilscher's SyCon configuration software to be installed on the same machine as the card. Also, configuration of the card is performed and downloaded through SyCon.