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.
READ MORE...
- 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
