The Problem
Customers have reported device “overload” messages, poor performance and responsiveness with Ignition Add-On Instruction (AOI) communication.
Ignition Allen Bradley Ethernet drivers are optimized based on current Rockwell guidance. No mechanism is offered to efficiently access the AOI structure, meaning tags must be read individually instead of as a whole structure.
Per RA Logix 5000 documentation: “The Predefined, Add-On-Defined, and Module-Defined types, and Booleans within these structures, are difficult to deal with for various reasons and are beyond the scope of this publication.”
Inductive Automation is committed to improving the Ignition Logix driver when a better solution is available.
Recommendations
- Given the current implementation of AOIs, consider using alternative options that may be more efficient, such as Rockwell technologies like RSLinx and FactoryTalk Linx.
- If using the Ignition Logix driver, limiting the read, write, and polling of AOIs is recommended since these communications are heavy operations.
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