Automation systems (ASs) based on Service-Oriented Architecture (SOA) are becoming more wide-spread. Due to their inherent property of separating the hardware- specific implementation from the logical work- or control- flow, SOA-based application programming is regarded as the next logical step in AS programming. Several success- ful attempts for implementing SOA-based AS have been made, but always with non-industrial, non-standard soft- ware like Devices Profile for Web Services. Based on the requirements of typical industrial SOA-based AS applica- tion, we will show that the industry standard data acqui- sition software OPC Unified Architecture is capable to serve as a SOA-based middleware.
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