Network structures and network configuration2.1 Integration of a production network in an enterprise networkIndustrial EthernetSystem Manual, 09/2019, C79000-G8976-C242-10 73● Common data managementData are only entered once and are available to the user across the entire factory (on thePLC or computer end, in the visualization system or the distributed I/Os). If the data arerequired at a different point, the software accesses the shared database. An elaborateconsistency check is not required. The "Industrial Datacenter" exists to this purpose.WinCC is typically used here for process visualization.● Modular system redundancy R1 in the backbone levelTo achieve the highest possible reliability and availability, all devices and connections areimplemented redundantly on the backbone level. The connection to the enterprisenetwork is a redundant Layer 3 coupling via VRRP.● Ring redundancy in the control network and in the factory networkThe control and operation network is implemented as a redundant ring topology. Becausefiber-optic cables are used, these transmission paths are insensitive to electromagneticinterference.Requirements for industrial networksThe special demands placed on industrial networks compared to office networks result fromthe structure of industrial plants and the requirements of manufacturing and processautomation that differ fundamentally from those of office applications. To ensure thatindustrial networks can fulfil their function, the following criteria already have to be taken intoaccount during concept and planning:● Industrial networks have to fulfil maximum requirements on the availability ("24/7"). Evenrare downtimes are not accepted. For this reason, it is often necessary to establishredundant structures. The network components used have to support the correspondingprotocols and technologies.● Depending on the application, the devices must be suitable for extreme ambientconditions, such as shocks and high temperatures. In addition, further requirements forexplosion protection, suitability for outdoor conditions or special certifications for variousbranches may also be necessary.● The hardware equipment of the devices have to allow flexible adapting to changedboundary conditions. Modular devices of the SCALANCE X series offer a high variabilityof the port configuration. In addition, some devices can be extended by means of a portextender. In the case of data-intensive applications the devices have to support GigabitEthernet or 10 Gigabit Ethernet. Long transmission paths or special ambient conditionsrequire Interfaces for fiber-optic cables. Many SCALANCE devices use the C-PLUG/CLPconfiguration memory, which simplifies the replacement of devices.● The spatial extent of the nodes integrated into the network is of great importance. WLANis often used for mobile units. In addition to common antennas, the RCoax radiating cableis an option for communication along predetermined paths or when radio coverage is notpossible or not to a sufficient extent. TeleControl and Teleservice can be used to accessdistributed stations at remote locations, possibly also via mobile wireless networks withUMTS or LTE.
