PROFIBUS and PROFINET are fieldbus communication protocols, with PROFIBUS being the older standard developed over 25 years ago for industrial automation applications. PROFIBUS is suited for high-speed synchronized applications like robotics, while PROFINET is an newer standardized Industrial Ethernet protocol that provides high-speed deterministic networking capabilities. Both support masters and slaves to control data exchange, with PROFIBUS having variants like DP, PA, and FMS and PROFINET using IO and CBA function classes to distribute devices and applications.

1. Engineering your Future
PROFINET Vs
PROFIBUS

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PROFIBUS
 PROFIBUS is the world’s leading fieldbus system.
 PROFIBUS has been around for almost 25 years.
 High speed synchronized servo application( robotics and NC
machines).
 Functional safety systems.
 Operation in hazardous environments.
 High availability systems.

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PROFIBUS FAMILY
 PROFIBUS-DP- Decentralized Periphery
 Low cost, simple, high speed field –level communications.
 Generally designed for internal use (cabinet maunting)

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 PROFIBUS PA- Process Automation
 Developed specifically for the process industry to replace 4-20mA
transmission.
 Two wire connection carrying both power and data.
 Generally designed for external use(field mounting).

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PROFINET
 Standardized Industrial Ethernet.
 High speed highly deterministic and capable networking.
 Generally designed for internal use (just like DP)

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CONNECTION TECHNOLOGIES
 PROFIBUS DP uses 2-core RS485 screened twisted pair wiring.
 9-pin sub-d or M12 connectors extensively used.
 DP can also use plastic or glass fiber optic cabling.
 PROFIBUS PA uses “ Manchester Bus Powered” (MBP) cabling
over 2 cores.
 PROFINET Uses 4-core Ethernet screened twisted pair cabling.
 RJ45 or M12 connectors universally used.

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 PROFINET is the open and all-encompassing Industrial Ethernet
solution.
 PROFINET has many features in common with PROFIBUS,
including shared profiles, engineering and support.
 Its innovative IO solution makes it perfect for modern real-time
applications.

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Supporting Devices
Profibus supports two main type of devices, namely, masters and
slaves.
 Master devices control the bus and when they have the right to
access the bus, they may transfer messages without any remote
request.
 Slave devices are typically peripheral devices i.e transmitters/sensor
and actuators.

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Profibus standards
 Profibus DP(master slave).
 Profibus FMS(multi-master/peer-to-peer).
 Profibus PA(intrinsically safe).

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FUNCTION CLASSES OF PROFINET
 In PROFINET have two function classes that are Independent of
each other.
 Profinet IO: The distributed field devices are connected through the
PROFINET IO .
 PROFINET IO uses three different communication channels to
exchange data with the control systems and other devices. The
standard TCP/IP channel is used for parameterization, configuration
and acyclic read/write operations.

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PROFINET CBA:
 This concept is designed for distributed industrial automation
applications.
 The PROFINET CBA is built on the standard DCOM (Distributed
Component Object Model) and RPC (Remote Procedure Call)
technologies.

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PROFINET Communication Concept
 PROFINET uses Ethernet as a communication medium.
 For transporting the data, the TCP or UDP and IP protocols are
implemented.
 PROFINET uses three channels for communication with different
performance classes according to the use envisaged .
 NRT (Non-Real Time) for non-time-critical processes: PROFINET
uses standard TCP/IP and UDP/IP to transmit data packets.
 RT (Real Time) for optimized data exchange performance: The read-
write operation for industrial automation requires mostly high-speed
data transfer, while standard TCP/IP or UDP/IP cannot satisfy this
requirement.

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 IRT (Isochronous Real Time) for clock-synchronized communication:
Drive applications, such as Motion Control, need to be satisfied
immediately. The IRT can do this with a response time of less than 1
millisecond.

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PROFINET Security Concept
 The core of the PROFINET Security Concept focuses on securing
networks in the separated security zones, the so-called cells .
 Different cells may be interconnected by a backbone network.
 Each cell can be connected to the backbone through an entry point
and is protected by using special security network components, such
as switches or other security devices.

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comparison

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