welcome to minuteprofinet today i will be explaining the differences between the two
most popular automation protocols PROFIBUS and PROFINET. Before we get started a quick
introduction my name is Michael Bowne I am part of P I North America a non-profit member supported
organization we aim to promote and educate the public on industrial automation and networking
technologies if you'd like to stay up to date and watch more of our videos please subscribe to our
channel but for now let's go to the white board for a complete profibus versus profunet comparison
so what is the difference between PROFIBUS and profinet in short profibus is a classic
cereal fieldbus and profinet is an industrial Ethernet protocol profibus and profinet are both
IEC standards created by the same organization profibus and profinet international everything
started with profibus introduced in 1989 and grew rapidly in the 90s then as the industry
shifted from field buses to industrial ethernet PI developed profinet which became available in the
early 2000s and has grown rapidly ever since because of their common source PROFIBUS and
profinet do share some similarities but generally they're very different just by visually observing
and comparing their networks you can spot some key differences profibus networks are generally
characterized by purple single-pair rs-485 cabling and those cables use the common db9 or
m12 connectors profinet networks on the other hand typically use green industrially graded Ethernet
cables for profinet networks the most common connector type is rj45 but m12 connectors are also
used in high exposure environments and BFOCS for fiber-optic applications now let's cover a more
in-depth comparison PROFIBUS is based on rs-485 which is a common serial communication method
in a PROFIBUS network you have PROFIBUS masters and profibus slaves. The master can be for example
a PLC, PAC or DCS PROFIBUS slaves can be a wide array of devices drives motors IO sensors field
devices robots actuators and more profibus has two flavors profibus DP and profibus PA
the general principle of profibus is collecting multiple inputs and outputs from the field into
a local i/o device and then transferring the data through just one cable to the master this approach
saves costs by the emission of additional hardware and cabling also it saves engineering time as it
streamlines network installation maintenance and troubleshooting profibus PA is the same PROFIBUS
DP protocol but based on a different physical layer MBP PROFIBUS PA is proven for use in
explosive areas where intrinsic safety is required when installing a PROFIBUS network users link each
device to the next in a process commonly referred to as daisy chaining resulting in a line topology
also they can employ star or tree apologies for more advanced configurations although this is
less common profinet on the other hand is based on standard Ethernet the same Ethernet that you might
have encountered in your home or office standard Ethernet cables are suitable for profinet networks
however most users employ profinet cables were just Ethernet cables but ruggedized built to
withstand the rough environment of a factory just like with PROFIBUS and a profinet network
you have PLC's PACs and DCSs and also sensors actuators robots rfid readers and other iOS
in profinet however we call these controllers and devices respectively similarly to profibus,
profinet also allows users to save in wiring and installation costs by using distributed IO
mechanisms profinet users have more flexibility when designing a network there's a variety of
topology options line star tree and ring also since profinet networks are based on standard
Ethernet specialized switches are not required you can utilize standard Ethernet switches to
implement flexible topology options in a cost-effective manner the only requirement
for switches is 100 megabits per second full duplex PROFIBUS and profinet are also different
in other technical aspects profibus networks can achieve speeds of up to 12 megabits per second
although most run at one and a half megabits per second the telegram size can be up to
two hundred forty four bytes and the address space is limited to 126 devices per network
profinet networks achieve speeds of 100 megabits per second or even 1 gigabits per second and
higher the telegram size can be up to 1440 bytes and there are no limits on the address space
another critical difference between PROFIBUS and profinet is the data exchange mechanism
profibus employs a master/slave interaction whereas profinet uses a consumer provider
model in a master/slave interaction the master has uni-directional control over all its slave devices
and processes the controller will always be the master and the i/o devices will always be slaves
the consumer provider model is more flexible in profinet networks controllers and i/o devices can
both assume consumer and provider roles leveraging the full duplex nature of Ethernet the controller
provides output data to the configured i/o devices in its role as provider and is the consumer of
input data from i/o devices the i/o device is the provider of input data and the consumer of output
data there are many substantial differences between PROFIBUS and PROFINET yet profibus and
profinet are both well proven industry leaders they are both suitable to fulfill complex
automation requirements and discrete process hybrid and motion control applications thousands
of device manufacturers develop and produce products available either a PROFIBUS or profinet
interface as of 2019 there were over 32 million profinet nodes and sixty million profibus nodes
installed worldwide it makes sense that PROFIBUS is more prevalent profinet is the younger
technology and when it was introduced there were already tens of millions of installed PROFIBUS
devices between the two Profinet is the clear winner from technical and investment protection
perspectives today the adoption of profinet is growing exponentially and in some years
its adoption will surpass PROFIBUS but even then PROFIBUS will still be an industry leader and it
will continue being the leading serial fieldbus technology historically we've covered a lot of
material in this video if you'd like to have this content as a PDF to be saved for future reference
we've created a downloadable document for you just follow the link in our description to the profibus
vs. profinet white paper also you can visit our website at us.profinet.com to learn more about
the technologies through training opportunities written materials and much more please feel free
to share your questions and feedback in the comments below and thank you for watching