Sinec H1 is an Industrial Ethernet communications protocol that provides the transport layer function widely used in automation and process control applications. The protocol was developed by Siemens and is used mainly for control applications. It has large bandwidth and is well suited to the transmission of large volumes of data.
It is based on the ISO/IEC 8073 standard which defines different transport methods. Sinec-H1 applies class 4 (CONS or Connection Mode Network Service).
This protocol has no application layer, which is defined in a project or product-specific way. The application layer protocols XMAT and Simadyn-D need to be mentioned in this context.
It is used as part of the control infrastructure of CERN and LHC.
Sinec H1 was introduced with Siemens' Simatic-S5 series. Sinec H1 was replaced by Profibus as “basic communication” at Siemens, when the Simatic-S7 PLC family was introduced.
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