Control.com - Nerds in Control

A few years back, I had a nice little "freeware" program to test Modbus from a PC. We have a whole bunch of Modbus applications coming up on multiple PLC platforms (AB, ProSoft, Siemens, etc.) that I'd love to have a little tester I could verify communications.

We usually provide the PLC and then need to connect to someone else's SCADA Modbus network.

Any ideas, I'd appreciate it.

Are you looking for Modbus/TCP or Modbus/RTU? Master (client) or slave (server)?

Hi,

Try the free software "Mtester".

Try http://www.win-tech.com. Their mainstay programs (Modscan/Modsim) are good for the price, but I think you can also run them in demo mode without buying it (must be restarted after 5 minutes).

Darrin

Check out automatedsolutions.com for Modbus RTU, ASCII, TCP, and Plus master and slave products including ActiveX Controls, .NET component, and OPC Servers.

Ready to run example applications allow you to easily exercise a broad range of Modbus functions.

Free, fully functioning 30 day trial versions are available for download.

Hello,
We have a free MODBUS TCP/IP Slave simulator program at http://www.hmisys.com.

Ciao,

Mark
http://www.hmisys.com

You can Use Modbus Tester, its a free software its trial version is easily available u can verify your communiaction

I recommend "modbusmat".

My favorite is Simply Modbus, available at http://www.simplymodbus.ca

The demo is fully functional and doesn't expire. It just has to be restarted after 6 messages.

http://www.soft-control.fr/downloads.php?lang=en

Also some tools to download...