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Industrial Ethernet - Modicon M221 Plc Page 27



Industrial Ethernet network

For Modicon M221, M221 Book, M241 and M251 logic controllers and Modicon TM4ES4 Ethernet switch module

Description of Ethernet services

Dynamic Host Configuration Protocol (DHCP) This protocol can be used to assign an address to a controller (DHCP/BOOTP client) automatically. This address can be: v ixed and determined either in the SoMachine software or included in a post- configuration file v assigned by a controller with the DHCP server or BOOTP server function (such as the TM251MESE logic controller) SNMP (Simple Network Management Protocol) From a network management station, the SNMP protocol is used to monitor and control the Ethernet architecture components, meaning problems are diagnosed quickly. The SNMP protocol is used to access configuration and management objects that are contained in the device MIBs (Management Information Bases). Modicon M241 and M251 controllers support the MIB 2 Standard SNMP network management interface. This interface accesses a first level of network management; it enables the manager to identify the devices making up the architecture and retrieve general information about configuration and operation of the Ethernet Modbus TCP interfaces. IP address filter (Whitelisting) IP addresses that are authorized to access the controller can be loaded in the controller from either an SD card or an FTP client. Locking communication protocols Not only SoMachine, NetManage


, SNMP communication protocols but also Modbus, Web and FTP servers can be locked individually in the SoMachine software. EtherNet/IP Adapter This function can be used to create a dedicated I/O table in the controller, which can be accessed via the EtherNet/IP protocol and by a controller with the Ethernet/IP Originator function. EtherNet/IP Adapter has the same role for EtherNet/IP as a slave Modbus TCP. EtherNet/IP Originator Controllers with this function are responsible for exchanges with devices with the Ethernet/IP Adapter function. EtherNet/IP Originator has the same role for EtherNet/ IP as a master Modbus TCP. SNTP Client For synchronizing controller clocks in the same network. The PLC can synchronize its time with an NTP/SNTP Server. DNS Client This service is used to convert a domain name to the IP address of the machine with this name. OPC UA Server OPC Unified Architecture (OPC UA) is an independent communication protocol for industrial automation applications. It is based on the client-server principle and allows sensors and actuators to communicate transparently with the ERP system or the cloud. The OPC UA Server is directly integrated in Modicon M241 and M251 controllers, allowing direct communication without passing via gateways and additional PCs with supervision systems.

(1) The NetManage function can automatically detect which controllers are present on the network. It also offers the option of straightforward connection to any controller present on the network in order to identify it physically by means of a visual or audible message and modify its parameters or manage the resident application.

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