Rockwell Driver Symbolic Access
b
bas bekker
After a lot of searching and asking for help we discoverred that the load on our L330-ERS2 PLC's was to high. This was when using the driver of Ignition. Although the drivers works it is not ideal and after using the rockwel OPC server the load on the PLC was a lot lower and we could do communications a lot faster with a lot more tags. The main reason not wanting to use the OPC server is that it is quite expensive. After asking arround we found out that the Rockwell driver uses symbolic access while the rockwell driver of Inductive is based on tag grouping. I do not know if it is possible to change the Inductive drivers or add a driver using symbolic access but for us the current driver is not sufficient for the amount of tags we communicatie on the speed we have to communicate.
This conclusion was reached by talking to support from both Rockwell and Inductive Automation.
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M
Michael Flagler
You should be posting this to the forums as there's quite a bit of help there in regards to communications performance. (Or maybe you have by now) Symbolic access is almost always going to be slower than the logical grouping that Ignition does. More likely is how your tags were configured. If this is using PlantPAx, then the difference isn't in symbolic vs grouping, but that Rockwell uses some "proprietary" methods they don't share with others on how to communicate faster with their PLCs. There's an alternative driver you can use (as long as you're not using Edge) that costs $1,000 USD made my Phil Turmel (Automation Professionals) that he's reverse engineered to work very closely to Rockwell's OPC server that's a drop-in replacement for the IA driver.