The design of the technology modules with PROFIBUS is oriented toward the ISO/OSI 7-layer model. The communication process between two nodes is distributed over seven layers, from Layer 1 (Physical Layer) to Layer 7 (Application Layer). PROFIBUS uses layers 1, 2 and 7.
Layer 1 defines the physical transmission. With PROFIBUS, there are copper-wire versions (RS485 and MBP) and optical and wireless transmission.
Layer 2 defines the description of the bus access method, including data security. With PROFIBUS, this is the master-slave method in conjunction with the token method.
Layer 7 forms the interface to the application and thus represents the link between the application and communication. With PROFIBUS, the communication protocol PROFIBUS DP is used here.
The actual application process lies above layer 7 and is not part of the OSI model.
ISO OSI Model and PROFIBUS
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