Network structures and network configuration2.1 Integration of a production network in an enterprise networkIndustrial Ethernet74 System Manual, 09/2019, C79000-G8976-C242-10● Latency periods during operation can often not be accepted; in some cases, real-timecapability is required. Fieldbus systems have been optimized for these specialrequirements. Office IT components for Ethernet do not fulfil these specific requirementsor not to a sufficient extent. The increasing prevalence of Ethernet and IP-basedcommunication in the industrial environment makes devices that are optimized for thisapplication necessary, for example, SCALANCE devices suitable for TSN. In addition, thedevices have to be suitable for industry protocols that are often used, such asPROFINET.● The use of IP-based networks for manufacturing and process automation makes thesesystems vulnerable because a connection to the Internet or to an office network almostalways exists. The damage expected in case of an attack on an automation network ismuch greater than that of an attack on an office network - up to material damage anddanger to persons. To exclude unauthorized accesses, the devices used for this purposemust have fundamental security functions. You can find further information in the section"SCALANCE S Industrial Security Appliance (Page 261)".● Remote maintenance is a particular problem with regard to network security because inthis case external participants have to access devices and plants. Devices of theSCALANCE S and SCALANCE M series allow access for remote maintenance ofmachines and plants without access to the plant network.● Because the investment costs are usually higher, industrial plants are used for a notablylonger time than office IT components. This means that in the case of industrial ITcomponents, updates for operating systems and application programs have to beavailable over periods that can be notably longer than ten years.● The process automation places very specific requirements on components and controlengineering. Thanks to their particular suitability for process automation, the devices ofthe following series fulfil the Siemens classification "PAready":– SCALANCE XC-200EEC– SCALANCE XF200-2BA– SCALANCE XP-200EECTo fulfil the requirements of the "PAready" classification, a device must support thefollowing technologies or standards:– Simple S2 system redundancy– MRP (Media Redundancy Protocol)– CiR (Configuration in Run)Configuration in Run is a function that allows plant and configuration changes, such asadding or modifying hardware, to be carried out in run without stopping the plant. Theexpansion H-CiR is available for applications in which high availability is required.In addition, the devices of the specified series conform to NAMUR NE 21. These devicesare available in a version for extended ambient conditions (conformal coating and anextended temperature range of -40 to +70 °C).
