Ignition OPC-UA by Inductive Automation
Ignition OPC-UA is fast, secure, and efficient. Best of all, since your connections will use TCP and not DCOM, remote connections are as easy and stable as local ones.
It includes drivers for the Allen-Bradley family of PLCs. More drivers will be coming soon. Ignition OPC-UA also features an open driver API so developers can write their own drivers.
Yes, it is free. You have to activate it with a CD-Key, but you can generate one for free with a valid email-address. Visit http://www.inductiveautomation.com/products/ignitionopc for more information.
Inductive Automation produces software that reduces frustration and increases efficiency in the industrial automation market. Our software facilitates the instant accessibility of meaningful information throughout the enterprise. We begin by listening, then acting on what we hear to inject innovation and unprecedented value into the industry.