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146 • ETHERNETNetwork CommunicationWAGO-I/O-SYSTEM 750ETHERNET TCP/IP5.3.4.3 BootP (Bootstrap Protocol)The BootP protocol defines a request/response mechanism with which theMAC-ID of a fieldbus node can be assigned a fix IP address.For this a network node is enabled to send requests into the network and callup the required network information, such as the IP address of a BootP server.The BootP server waits for BootP requests and generates the response from aconfiguration database.The dynamic configuration of the IP address via a BootP server offers the usera flexible and simple design of his network. The WAGO BootP server allowsany IP address to be easily assigned for the WAGO fieldbuscoupler/controller. You can download a free copy of the WAGO BootP serverover the Internet at: http://www.wago.com.More informationThe procedure for address allocation with the WAGO BootP Server isdescribed in detail in the Chapter “Starting up an ETHERNET TCP/IPfieldbus node”.The BOOTP Client allows for dynamic configuring of the networkparameters:Parameter MeaningIP address of the client Network address of the controllerIP address of the router If communication is to take place outside of the localnetwork, the IP address of the routers (gateway) isindicated in this parameter.Subnet mask The Subnet mask makes the controller able todifferentiate, which parts of the IP address determinethe network and which the network station.IP addresses of the DNSserversHere the IP addresses can be entered by maximally 2DNS servers.Host name Name of the hostWhen using the bootstrap protocol for configuring the node, the networkparameters (IP address, etc... ) are stored in the EEPROM.NoteThe network configuration is only stored in the EEPROM when the BootPprotocol is used, although not if configuration is done via DHCP.The BootP protocol is activated in the controller by default.When the BootP protocol is activated, the controller expects a BootrP serverto be permanently present.If, however, there is no BootP server available after a power-on reset, thenetwork remains inactive.To operate the controller with the IP configuration stored in the EEPROM,you must first deactivate the BootP protocol. |
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