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Select either OPC client / servers or .Net or ActiveX communications controls for your applications. Download the simple sample app with code and dll  or OPC client and servers separately. OPC client controls will need a server to communicate with.

OPC servers run as a separate executable file. OPC servers interface with ours and other parties client controls. They use tagnames as references to device registers. The OPC server scans device registers in the background and updates the client controls automatically..

.Net and ActiveX drivers run in the same application (in-process). PLC registers are referenced by register name/address only.

.Net Native Mode I/O Communications drivers   VB.Net ,,
  Pricing Modbus     Master / Slave serial  communications driver          (developed for .net)
for any device that uses Modbus protocol
Free trail download  with 2008 app (convert for vs 2010)

Download Modbus Help file
  Pricing Modbus TCP Ethernet   Master   communications driver  (developed for .net)
for any device that uses Modbus TCP protocol
  Free trail download  with 2008 app

Download ModbusTCP Help file
  Pricing Allen Bradley  DF1   Master serial communications  driver (developed for .net)
for SLC 5/03 , SLC 5/04, Micrologix  or SLC 5/05 serial port
Free trail download  with 2008 app

Download Allen Bradley Help file
  Pricing Allen Bradley SLC 5/05 Ethernet  communications  driver 
for SLC 5/05 Ethernet port communications
Free trail download  with 2008 app    
(developed for .net)
  Pricing Allen Bradley ControlLogix Ethernet/IP   CIP native Tag based  (not PCCC)   communications  driver     for ControlLogix 5000 series  (developed for .net)
  Free trail download  with 2008 app
No royalties
unlimited usage both as development and runtime.
PLC image sm.gif (5705 bytes)
These are simply zipped (compressed)  VB.Net source code applications that have the DLL control in the folder. Just download and start as a  Visual Studio project. No installation required.  No registration.

Sample has a simple Read and a Write button to transfer to/from registers in the your PLC. Make changes to the source code as needed for your real world application.

It doesn't get any easier that this!

 Times out after 2 hours, but is restartable..        Only 366 KB  entire download,  Commxxx dll control + sample app!



OPC Client  Controls

  ArrowB1F3.gif (4190 bytes)Download HMI OPC Client Controls for  (does not include OPC servers - download separately) OPC client controls Pricing OPC VB HMI Client Controls
No royalties
unlimited usage both as development and runtime.
                                State display and button


Text I/O


See sample client control pages With these 3 simple low cost OPC client controls you can do OPC in with minimum coding. No need for complex OPC setup of servers, groups and item tags in your code. These controls do it all for you. Simply reference these  dll's that reside in your project folder.

 Will work with any OPC I/O server.

Client controls for Button, TextIO and Display States, Trending of OPC tags.

Contains client controls and a sample application.
Requires  VB.Net 2008.    Times out after 2 hours, but is restartable.
1.0 MB

Trend plot with overlay capability for plotting repeat runs


+ we have:
Event Logging
Data Logging


OPC  Server Controls
ArrowB1F3.gif (4190 bytes)Download complete Kepware OPC KEPServer Communication I/O Controls  with selectable drivers for AB, Modbus, ControlLogix, etc OPC Server I/O Communications       from Kepware
PLC image sm.gif (5705 bytes)                        Contains all KEPServer OPC servers. Use with our OPC client controls or write your own.
Download the server pack, then run the .exe file to install. This includes all OPC servers and help files. Select the desired server(s) when installing. Servers will run for (2) hours before timing out.They can be restarted.  All servers require a license for each PC used on.
69 MB



ActiveX I/O Communications only
ArrowB1F3.gif (4190 bytes)Download Communication I/O ActiveX Controls ActiveX Communications
   No client controls available.
PLC image sm.gif (5705 bytes) Modbus, AB, AutomationDirect (PLC Direct)

Contains ALL I/O (PLC)  Comm drivers WITH OUT Scanning or tag naming. Includes help files and sample applications including VB and Excel apps for Modbus, AB, AutomationDirect,  Select from the setup menu only the comm components that you want installed. Times out after 2 hours, but is restartable..
2.1 MB



Download help files for OPC client controls

Download help files for Comm ActiveX controls

Download application file for Allen Bradley df1 for 2005 ver 8

All controls will work with Win 7 (32 or 64bit), Vista,/XP/

Use with  ActiveX xontrols with VB6 or .Net native mode controls with VB.Net

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Download / install selected server then download the OPC client controls if desired. Run each setup file to install. Demos are full working copies that have a time out which can be restarted. If purchased we will email you a unlock key code.

All VB/Visual Studio packages should have latest service packs installed  - which can be found at


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