• Fast redundancy in the ring;
  A redundant network structure is created by interconnecting the ends of an optical line to form a ring. The SCALANCE XM-400 switches have an integral redundancy manager (RM) which monitors the function of the network continuously. It recognizes the failure of a transmission path or the failure of a SCALANCE XM-400 switch in the ring and then activates the substitute path. In rings with SCALANCE X-200 or OSM/ESM, it is possible to integrate XM-400 switches at 100 Mbit/s. In rings with SCALANCE X-300 and SCALANCE XR-500, it is possible to integrate XM-400 switches with Gigabit.
• Fast standby redundancy; ?
  The integrated standby function permits a reliable interconnection of several rings. Two transmission links are used to connect two XM-400 switches of a ring to the other ring
• Time synchronization;
  diagnostic messages (log table entries, e-mails) are time-stamped. The local time is standardized throughout the network by means of time synchronization with a time server, thereby simplifying the assignment of diagnostic messages of several devices.
• Load limiting when using multicast protocols (e.g. Voice over IP, Video)
• By learning the multicast receivers, XM-400 switches can also filter multicast data traffic and thus limit the load in the network.
• Redundant interfacing to company networks;
  XM-400 switches support the standardized redundancy procedures Spanning Tree Protocol (STP) and Rapid Spanning Tree Protocol (RSTP). This enables a subnetwork to be connected redundantly to a higher level corporate network with reduced requirements for the reconfiguration time (in the order of seconds).
• Support for virtual networks (VLAN);
  For structuring Industrial Ethernet networks with a fast growing number of users, a physically existing network can be divided into several virtual subnets, e.g. to divide the network into logical areas. In this way, very large Ethernet networks can be subdivided into smaller subnets with their own IP address space.
• Support for Quality of Service (QoS) through IP Type of Service (ToS) and prioritizing according to 802.1Q
• Link Aggregation (IEEE 802.3ad) for parallel use of ports to increase the transmission rate and fail-safety.
• Support for port prioritization
• Support for bandwidth limiting (Broadcast Limiter, Multicast Limiter, Unicast Limiter)
• Flow control
• Simple device replacement;
  All settings are automatically backed up on the C?PLUG plug-in swap medium (included in scope of delivery). If a switch of the SCALANCE XM-400 series has to be replaced, then these settings are simply transferred to the replacement device by plugging in the C-PLUG.

Additional function through Layer 3 KEY PLUG

• Layer 3 switching support
  • Static routing
  • Dynamic routing
  • Router redundancy
    The integrated dynamic routing protocols OSPF (Open Shortest Path First) and RIPv2 (Routing Information Protocol) govern the communication to other IP routers in the network.
• Redundant Layer-3 switching (routing) is achieved with the integrated VRRP function (Virtual Router Redundancy Protocol).
• IPv6 support (available soon), support of dual-stack routing (IPv4 / IPv6)

Integrated security

• Port security
• Access Control to Agent
• Authentication 802.1X
• SSH
• HTTPS
• SNMPv3
• RADIUS

Network topology and network configuration

The network topology can easily be adapted to the structure of the plant with SCALANCE XM-400 Industrial Ethernet switches. The following network structures and combinations of structures can be implemented:

• Gigabit and Fast Ethernet rings with fast media redundancy:
  To protect against the failure of a transmission link or a switch, up to 50 linearly cascaded switches can be interconnected to form a ring. On the failure of a transmission link or of a switch in the ring, the transmission path is reconfigured within 300 milliseconds.
• Several rings can be redundantly linked through the standby function.
• In addition, SCALANCE XM-400 supports redundant connection of the ring structure to the corporate network with a rapid spanning tree.
• Star topology with SCALANCE XM-400 switches:
  The switch represents a neutral star point that can interconnect up to 24 nodes or subnets electrically or optically

When configuring the network, it is necessary to observe the following boundary conditions:

• Maximum line length between two modules for multi-mode fiber-optic conductors:
  • 5000 m at 100 Mbit/s
  • 750 m at 1 Gbit/s
• Maximum line length between two modules for single-mode fiber-optic conductors:
  • 200 km at 100 Mbit/s
  • 120 km at 1 Gbit/s
• Maximum length of installation cable:
  • 100 m at 100 Mbit/s with IE FC TP Cable 2 x 2 and IE FC Plug 180
  • Max. 90 m at 1 Gbit/s with IE FC TP cable 4 x 2, IE FC RJ45 modular outlet and patch cable (10 m)
  • 100 m at 1000 Mbit/s with IE FC TP Cable 4 x 2 and IE FC Plug 4 x 2

Commissioning and diagnosis

• Signal mask;
  The signal mask is set to the current status of the SCALANCE XM-400 (setpoint state) by pushbutton operation. The signal mask defines which ports and which power supplies are to be monitored. The signal contact only reports an error when a monitored port or a monitored feeder fails (deviation of setpoint/actual status).
• Using a serial interface (RJ11), a PC or a programming device can be connected directly; operation is carried out using commands (Command Line Interface - CLI)
• IP address;
  the IP address is assigned via DHCP (Dynamic Host Configuration Protocol). If there is no corresponding server in the network, the IP address can be assigned using an enclosed software tool or via the serial console interface (CLI).
• The following status information is displayed by LEDs on site:
  • Port status
  • Port mode (10/100/1000 Mbit/s, full/half-duplex)
  • Status of the two voltage feeders
  • Signal contact status
  • Signal mask (setpoint status)
  • RM mode
  • Standby mode
• The status of the signal contact is routed externally by means of floating relay contacts. This enables, for example, the module to be monitored via an input module from a controller.
• Redundancy manager RM;
  To establish a ring, a SCALANCE XM-400 is switched to the RM mode. The non-ring ports of the RM can be used freely for the connection of data terminals and networks. If the redundancy procedure MRP standardized by PROFINET is used, the RM is adjusted automatically.
• Monitoring via the Industrial Ethernet network;
  the following possibilities are available:
  • via standard browser (Web-based management):
    Selection of SCALANCE XM-400 switches via the network from a PC with browser
  • via the browser of a mobile device (Smartphone, Tablet)
  • Reading out the address of the mobile website of the XM-400 by means of NFC:
    - mobile terminal starts browser with this address
    - powerful diagnosis by means of an existing WLAN
  • via SNMP V1, V2c, V3:
    Secure integration of SCALANCE X-400 switches via the network into a network management system, e.g. SINEMA Server
  • via PROFINET IO diagnostics:
    Standard diagnostic alarms can be configured in an easy, familiar manner in STEP 7 and processed in SIMATIC.
    The engineering outlay is drastically reduced for the PLC and HMI through complete integration in the SIMATIC system error message concept SFM.

Network management

The network management provides the following functions:

• Password-protected dial-up for "Administrator" (read and write authorization) and "User" (read only)
• Access protection by means of access control list
• Encrypted HTTPS access
• Read-out of version and status information
• Setting the signal and standby mask and address information
• Fixed parameterization of the ports (data rates, half/full duplex)
• Setting parameters of the VLANs and multicast services
• Parameterization of the standby connections for a redundant ring link
• Setting of Rapid Spanning Tree parameters
• Defining a maximum load per port for load limiting (port thresholds)
• Output of statistics information
• Diagnosis of data traffic by means of a parameterizable mirror port with a standard commercial network analyzer
• Loading of new firmware or the configuration data via the network by a TFTP server
• Saving the configuration data or log table via the network on a TFTP server
• Configuration of the IP routing function after activation with KEY-PLUG (static routing, dynamic routing (OSPF, RIP v1/2), and redundant routing (VRRP))

If faults occur in the network, the SCALANCE XM-400 switch can independently send error messages (traps) to a network management system (e.g. SINEMA Server) or also e-mails to a predefined network administrator.

Remote monitoring (RMON) provides the following functions:
The SCALANCE XM-400 switch can collect statistics information according to the RMON groups 1 through 4. These include, for example, fault statistics that are kept for each port. This information can be read out through Web-based management in the statistics sub-area.