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At Kennedy Space Center, we are working to create a first in first out event log consisting of a date and time and a integer code representing an event in the Modicon Quantum PLC (Function Block). We speculated that we might be able to use some defined data types in Concept to create a custom type with several bytes ( Array [year month day hour min sec event_code] ). We had discussed creating a pointer system to push items onto this stack and keep a rolling list of the last, say, 20 events. Here, we figured others have already done this and NASA was hoping to see how others have implemented this idea. Any comments/ideas would be greatly appreciated. Chris Iannello Power Systems NASA Kennedy Spce Center, Florida 321-861-3276