Maybe 2025 is the year for GE drivers?
Not real likely, sorry. No client/sponsor has raised its priority for me.
I've just always used the built in OPC server.
My driver would likely target devices that use the earlier version of the protocol, and have no OPC Server option. 90-30 and various Fanuc robots ("HMI protocol") would be the target market.
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That's exactly what we are waiting for! 
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Hi Miguel, if %M variables are Discrete internal registers I don't understand why they have to be transferred to %R which are Word holding registers? Wouldn't %Q or %I make more sense