Modicon M340 Plc Page 2-11 Communication

2/11 Functions Ethernet universal services The universal Ethernet services used are as follows: b HTTP (HyperText Transfer Protocol) : v This protocol is used for transmitting Web pages between a server and a browser. v Web servers embedded in Transparent Ready automation products provide easy access to products located anywhere in the world from a standard web browser such as Internet Explorer. b BOOTP/DHCP ( RFC1531) : v These protocols are used to provide devices with IP parameters automatically. This avoids having to manage each device address individually by transferring this management to a dedicated IP address server. v The DHCP protocol (Dynamic Host Configuration Protocol) is used to assign configuration parameters to devices automatically. DHCP is an extension of BOOTP. v Schneider Electric devices can be BOOTP clients (used to retrieve the IP address automatically from a server) or BOOTP servers (allowing the device to distribute IP addresses to the network stations). v Schneider Electric uses standard BOOTP/DHCP protocols for its FDR (Faulty Device Replacement) service. b FTP (File Transfer Protocol) (RFCs 959, 2228, and 2640) : v This protocol provides the basic elements for file sharing. Many systems use it to exchange files between devices. b TFTP (File Transfer Protocol) (RFCs 959, 2228, and 2640) : v This network transfer protocol can be used to connect to a device and download code to it. v For example, it can be used to transfer a boot code to a workstation without a disk drive or to connect and download updates of network device firmware. v Transparent Ready devices implement FTP and TFTP for transferring certain information to or from devices, in particular for downloads of firmware or user-defined Web pages. b SNMP (Simple Network Management Protocol) (RFCs 1155, 1156 and 1157) : v The SNMP standard manages the various network components via a single system. v The network management system can exchange data with SNMP agent devices. This function allows the manager to display the status of the network and devices, modify their configuration and feed back alarms in the event of a fault. v Transparent Ready devices are SNMP-compatible and can be integrated naturally in a network managed via SNMP. b COM/DCOM (Distributed Component Object Model) (RFCs 1155, 1156 and 1157) : v COM/DCOM or OLE (Object Linking and Embedding) protocol is the name of the technology consisting of Windows objects which enables transparent communication between Windows applications. v These technologies are used in the OFS (OLE for Process Control Factory Server) data server software. . Modbus standard communication protocol Modbus protocol, the industry communication standard since 1979, has been combined with Ethernet Modbus/TCP, the medium for the Internet revolution, to form Modbus/TCP, a completely open Ethernet protocol. The development of a connection to Modbus/TCP does not require any proprietary component, nor purchase of a license. This protocol can easily be combined with any product supporting a standard TCP communication stack. The specifications can be obtained free of charge from the following website: www.modbus-ida.org . Modicon M340 automation platform Ethernet Modbus/TCP network Ethernet Modbus/TCP communication services Processors: page 1/8 Ruggedized Modicon M340 modules: page 3/2 2 1 3 4 5 6 7 8 9 10 2 1 3 4 5 6 7 8 9 10

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