Most Likely you can do this with what you have as long as you have the correct driver in Kepware.
Do you have Kepware running on a PC near the machine I ask because a hardware gateway may have been a better solution so that you don't have the issues of dealing with a PC.
The only time I use Kepware is if I have a PC based HMI or I am doing data collection to a PC based system and I have to use a PC anyway.
For PLC to PLC comms I like to use a hardware gateway solution and my favorite is the Red Lion Data Station Plus because it has drivers for almost everything and is simple to setup and priced well.
For what you have I would have used a Red Lion G3 series HMI vs the Panelview Plus and it would have taken care of the HMI and it has the Gateway and drivers built in like the Data Station plus so in that setup you have a lot of money could have been saved and you would have had a much more reliable solution.
Just something to keep in mind for the future. The Red Lion G3 HMI's beat the Panel View Plus in almost every metric all day long.