Network components - SIMATIC NET - Siemens  |   12/02/2008 8:47 PM  
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Network components

PROFIBUS networks can be implemented with different transmission media for the most varied applications.
Electrical networks
  • The electrical network uses a shielded twisted-pair cable with circular cross-section as standard for data transmission. Depending on application there are cables
    - with PE or PUR sheath,
    - in halogen-free design,
    - for burial or as ground cables
    - specially for hazardous locations.
    With the PROFIBUS FastConnect system the PROFIBUS copper cables can be assembled quickly and easily on site.
Optical networks
  • Optical data transmission takes place via fiber-optic cables with glass or plastic fibers for interior or exterior application, as ground cable or in halogen-free design.
  • An optical network in ring, linear bus or star topology can be implemented using the OLM (Optical Link Module) and OBT (Optical Bus Terminal).
Hybrid networks
  • Hybrid electrical and optical networks are possible. The transition between both media is implemented by the OLM (Optical Link Module).
Wireless coupling
  • Using the PROFIBUS Infrared Link Module (ILM), individual or multiple PROFIBUS slaves or slave segments can be connected wirelessly. For a maximum transmission rate of 1.5 Mbit/s and a maximum range of 15 m, communication to moving parts, e.g. to automated guided vehicles, and the replacement of systems subject to wear (sliprings or slipconductors) are possible.

Data terminals are connected either via bus terminals or bus connectors. Using repeaters, several bus segments can be switched in series.

The tables below will assist you in selecting your network components:

Summary of network components

Summary of network selection criteria for transmission media

Selection criteria for electrical and optical networks

PROFIBUS network components and accessories

Transitions between the transmission media

Siemens AG 2008