PROFIBUS (Process Field Bus) is a standard for Fieldbus communication, and one of the world’s current leading Fieldbuses. It enables data to be exchanged cyclically between devices on the lower field level (decentralised peripheral devices, slaves) and higher-level controller units (central masters). It has now become a key communication protocol used in manufacturing technology, as well as process technology and engineering. The master-slave system can use both twisted pair cables and fibre optic cables.
If higher speeds are required, the successor PROFINET with its Ethernet capability can be used.
LAPP is a member of the user organisation PROFIBUS Nutzerorganisation e.V. (PNO) and plays an active role in further developing PROFIBUS.
The following two variants of PROFIBUS are primarily used.
Fieldbus communication in manufacturing technology can be handled using either a mono-master set-up or a multi-master system (where several masters are connected to a bus). The masters query input information from the slaves at cyclic intervals and return output information. Different versions of the PROFIBUS DP system are available:
- DP-V0 for cyclic communication,
- DP-V1 additionally for acyclic communication,
- DP-V2 additionally for isochronous real-time functionality, use of time stamps, and slave-to-slave communication.
PROFIBUS DP offers a transfer rate of 12 Mbit/s and can combine up to 126 devices (masters and slaves) in a network.
PROFIBUS PA is used for communication in process automation applications. As the power is limited, PROFIBUS PA is ideally suited for use in potentially explosive atmospheres. The transfer rate of 31.25 kbit/s allows for long cable paths and a high degree of resistance to electromagnetic interference.
The names of the PROFIBUS-compliant products from LAPP’s UNITRONIC® range (for cables) and EPIC Data range (for PLUG connectors) include the designation “BUS DP” for PROFIBUS DP and “PA” for PROFIBUS PA.