jnesbitt Posted September 30, 2012 Report Posted September 30, 2012 Anyone else familiar with the AGP3400's ASYNC mode and why it allows ladder logic to run? Test of ladder logic instruction execution was to set a value in an int early in the ladder logic, then display it. Will look at profiling & reducing execution/scan time of the long ladder logic I inherited which does many modbus tcp reads over ethernet. There is a system variable for max and avg scan time. Setting longer scan times didn't seem to help but ASYNC mode does make the ladder instructions run. Can use counters to do modbus reads less often. The remote IO over modbus tcp was executing in any case. The ladder logic in this program didn't have any error checking or handling built in but will add some. Quote
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