Which network topology does PROFIBUS use?
Which network topology does PROFIBUS use?
As far as the topology is concerned, PROFIBUS DP networks are linear, and you use gateways, repeaters, and terminators.
How does PROFIBUS work?
The communication basis for PROFIBUS lies in the cyclic data exchange between PLCs (masters) and devices (slaves). PROFIBUS components communicate using the PROFIBUS DP (Decentralized Periphery) communication protocol, which is the same for all applications and which allows cyclical and acyclical communication.
Which OSI layers are used for PROFIBUS?
ISO/OSI Model PROFIBUS uses layers 1, 2 and 7. Layer 1 defines the physical transmission.
Does PROFIBUS use Ethernet?
PROFIBUS networks are generally characterized by purple single-pair RS-485 cabling. And those cables use the standard DB9 or M12 connectors. PROFINET networks, on the other hand, typically use green industrially graded Ethernet cables.
What is the difference between Ethernet and PROFIBUS?
While Profibus cables may be up to 1000 meters long, shorter cable lengths are required for higher data rates. Profinet is a newer, Ethernet-based industrial communications protocol. Because Profinet uses the same physical connection standards as Ethernet, standard Ethernet switches can be used to expand your network.
What is PROFIBUS and its types?
There are two variations of PROFIBUS in use today; the most commonly used PROFIBUS DP, and the lesser used, application specific, PROFIBUS PA: PROFIBUS DP (Decentralised Peripherals) is used to operate sensors and actuators via a centralised controller in production (factory) automation applications.
What is DP and PA in PROFIBUS?
PROFIBUS DP (Decentralised Peripherals) is used to operate sensors and actuators via a centralised controller in production (factory) automation applications. PROFIBUS PA (Process Automation) is used to monitor measuring equipment via a process control system in process automation applications.
What is the difference between PROFIBUS DP and PROFIBUS PA?
PROFIBUS PA is a variant of PROFIBUS DP that is specially designed for improvement and replacement of conventional systems such as 4-20 mA and HART in process automation. In contrast to PROFIBUS DP, data and power supply are transported over the same two wires and there is an explosion proof option available.
What is DP and PA in Profibus?
What is PROFIBUS DP network topology?
As far as the topology is concerned, PROFIBUS DP networks are linear, and you use gateways, repeaters, and terminators. Last but not least, DP networks can have a ProfiSafe profile and they can be used in SIL3 safety applications. What is Profibus PA? Initially, the PROFIBUS PA protocol was developed as an evolution of HART communication.
What is the speed of PROFIBUS?
Looking at the speed, the network works at 9.6 kbp/s up to 12 Mbp/s in a system of 100 to 1000 meters. As far as the topology is concerned, PROFIBUS DP networks are linear, and you use gateways, repeaters, and terminators.
How are PROFIBUS PA devices connected to the controller?
PROFIBUS PA devices are not connected directly to the controller. This sits on the faster PROFIBUS DP network and is reached through a coupler or link. The coupler/link acts as a network interface and supplies the power to the bus.
Is PROFINET better than PROFIBUS?
Yes, PROFINET supports faster communication and you also have more bandwidth. This means a message exchanged on the PROFINET network can contain a lot more information than a message on PROFIBUS. Below you have a table from PROFIBUS International making a comparison between both options:
