Industrial Ethernet

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Overview

Benefits

中国西门子总代理商PLC模块代理Overview

Typical configuration example for redundant plant bus

The plant bus and the terminal bus for multi-user systems withclient/server architecture are implemented with IndustrialEthernet, a powerful area and cell network for industrialapplications in line with the international IEEE 802.3standard (Ethernet). Bus structures with optical rings areparticularly suitable for this because of their interferenceimmunity and high availability.中国西门子总代理商PLC模块代理

In medium-sized and large plants with high requirements, SIMATICPCS 7 relies on modern FastEthernet and Gigabit technology.This combines the high reliability of optical rings with thescalable performance of switching technology and high transmissionrates of up to 10 Gbps.

中国西门子总代理商PLC模块代理

Benefits

Ethernet is now the number 1 network technology in the globalLAN environment. Ethernet offers important characteristics that cangive you significant advantages for your application:

• Fast commissioning through simple connections

• High flexibility since existing networks can be extended withoutany adverse effects

• High availability thanks to redundant network topologies

• Almost unlimited communications performance because scalableperformance is available through switching technology ifrequired

• Networking of different application areas (e.g. office andproduction)

• Investment security through continuous compatible furtherdevelopment

• Plant-wide clock system permits exact assignment of eventswithin the entire system中国西门子总代理商PLC模块代理

With Industrial Ethernet, SIMATIC NET expands Ethernet technologywith future-proof network components with special features andcapabilities for use in industrial environments, for example:

• Rugged design, suitable for harsh industrial environments

• Fast local assembly using the FastConnect cabling system

• High fault tolerance due to redundancy and fast redundancyswitchover, from bumpless redundancy through PRP and HSR to ringredundancy with MRP

• Continuous and central monitoring of network components with asimple yet effective signaling concept, and network managementsoftware

中国西门子总代理商PLC模块代理

The following Ethernet communications interfaces are used in thevarious SIMATIC PCS 7 subsystems (ES, OS, AS etc.):

• Interface modules integrated onboard

• Simple network adapters

• Special communications modules, e.g. CP 1623 andCP 1628

They are defined when selecting the respective system components,depending on the requirements. You can find more information in thesection "System connection of PCS 7 systems".

The communication stations can be integrated in the terminal busand the plant bus using Industrial Ethernet switches of theSCALANCE X product family. These switches offer scalableperformance at an attractive price and support a wide variety ofconfiguration options.v中国西门子总代理商PLC模块代理

Configuration example for plant and terminal bus

Client-server and server-server communication is carried out on adedicated Ethernet LAN. The communication network identified as aterminal bus can be implemented with standard SIMATIC NETcomponents such as Industrial Ethernet switches, onboard interfacemodules, network adapters, communications processors (CP), cabling,etc.中国西门子总代理商PLC模块代理

A ring design avoids communication failures should the line becomedamaged or disconnected at a particular point. To further increaseavailability, it is also possible to distribute terminal buscommunication over two redundant rings. Each PCS 7 station isconnected to one of two Industrial Ethernet ports on each of thetwo separate rings. The SIMATIC NET SOFTNET‑IE RNAcommunication software on the PCS 7 stations organizescommunication processes based on the PRP. Non-PRP-enabled terminaldevices that have only one Industrial Ethernet port can beintegrated in the redundant terminal bus via SCALANCEX204RNA.中国西门子总代理商PLC模块代理

According to IEC 62439-3, the Parallel RedundancyProtocol (PRP) is based on double transmission ofmessage frames over two separate networks (Ring 1,Ring 2). On the sender side, the SOFTNET-IE RNA software orSCALANCE X-200RNA network access point duplicates the message framearriving from the sender and feeds one message frame to Ring 1and the other to Ring 2. On the receiver side, the software ornetwork access point forwards the first incoming message frame tothe recipient. The second message frame from the second LAN isdiscarded. Transmission of the message frame is thus always ensuredwithout delay if an error occurs.

The automation systems (AS) communicate with one another and withthe engineering system and Operator Systems (Servers/SingleStations) over the Industrial Ethernet plant bus. This can beconfigured in a similar way to the terminal bus, using SIMATIC NETstandard components such as Industrial Ethernet switches, networkadapters, communications modules (CP), cabling, etc. For smallplants with up to 8 standard automation systems per OperatorSystem, Single Stations and servers can be efficiently operated onthe plant bus using "Basic Communication Ethernet" (BCE) and aFastEthernet network adapter. The CP 1623/CP 1628communications module is always required if more than 8 automationsystems or redundant automation systems areused.中国西门子总代理商PLC模块代理

As far as availability is concerned, ring topologies are always thefirst choice for the plant bus. With particularly high availabilityrequirements, the plant bus can also be configured as a redundantdouble ring (two CPs per AS CPU and OS server). Double faultssuch as a switch failure on ring 1 with a simultaneousinterruption in the bus cable on ring 2 can then be tolerated.The two rings in such a configuration are physically separated. Thecoupling partners are linked together logically when configuringwith NetPro over a high-availability S7 connection (4‑wayredundancy). One switch each takes over the function of theredundancy manager for each ring. The current switches of theSCALANCE X‑500, X‑400, X‑300 and X‑200 product lines can act asredundancy manager in a ring.

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