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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