Chapter 4. Configuration48 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual GFK-2224QLocally edited configuration changes cannot be retrieved into the PLC and loaded to the programmer. Locallyedited configuration changes are always overwritten when a PLC configuration is stored into the PLC from theprogrammer.Initial IP Address AssignmentEach PACSystems Ethernet Interface comes from the factory with a default IP address (0.0.0.0). Because thisdefault address is not valid on any Ethernet network, an initial IP address must be assigned for initial networkoperation, such as connecting the programmer to download the first hardware configuration. The initial IPaddress must be selected for proper operation with your network and application; see your networkadministrator for the proper initial IP address value.An IP address can be set using the “Set Temporary IP” method if the PLC is not in a RUN state, even if theEthernet interface already has a valid configured IP Address. If the Ethernet interface has the factory default IPAddress 0.0.0.0, a temporary IP address can be set using BOOTP over the Ethernet network, if a BOOTP server ispresent.Alternatively, an initial IP address can be set via the CHSOSW command from a local serially connected StationManager terminal. See PACSystems TCP/IP Communications Station Manager Manual, GFK-2225, for details.A third way of setting the IP address is to configure the IP address in Hardware Configuration and store theconfiguration over a serial connection.Assigning a Temporary IP Address Using the Programming SoftwareTo initiate Ethernet communications with the programmer, you first need to set up a temporary IP address.After the programmer is connected, the actual IP address for the Ethernet interface (as set up in the hardwareconfiguration) should be downloaded to the PLC. The temporary IP address remains in effect until the Ethernetinterface is restarted, power-cycled or until the hardware configuration is downloaded or cleared.▪ To use the Set Temporary IP Address utility, the PLC CPU must not be in RUN mode. IP address assignmentover the network will not be processed until the CPU is stopped and is not scanning outputs.▪ The current user logged on to the PC running the Set Temporary IP Address utility must have fulladministrator privileges.▪ The Set Temporary IP Address utility can be used if communications with the networked PACSystemstarget travel across network switches and hubs. It does not work if communications travel through arouter.▪ The target must be located on the same sub-network (subnet) as the computer running the Set TemporaryIP Address utility. The sub-network is specified by the computer’s subnet mask and the IP addresses of thecomputer and the PACSystems Ethernet Interface.
