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OPC-10000-4 – OPC Unified Architecture - Part 4: Services6.6.2.4.2 ServiceLevelServiceLevel The ServiceLevel provides information to a Client regarding the health of a Server and its ability to provide data. See OPC 10000-5 for a formal definition for ServiceLevel ... ServiceLevel is a byte with a range of 0 to 255, where the values fall into the sub-ranges defined in Table 105 . The algorithm used by a Server