GE GFK-1004B user manual Determining If an IP Address Has Already Been Used

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Determining If an IP Address Has Already Been Used

It is very important not to duplicate IP addresses. To determine if you have configured your Series90-70TCP/IP-Ethernet station with the same IP address as another station, disconnect the station in question from the LAN, then try a PING command to that IP address from another station. If you get an answer to the PING, then the chosen IP address is already in use.

Precedence of TCP/IP Parameter Sources

The Ethernet Interface receives TCP/IP parameters from the GEnet System Manager (GSM) each time the board is downloaded from the GSM. It is also possible that a Logicmaster 90 system which uses TCP/IP configuration mode (ªConfig Modeº) will be able to specify the same TCP/IP parameters to the PLC CPU, which passes them on to the Ethernet Interface through Soft Switches. With two sources for the same information, it is important to understand which set of parameters apply in any given situation.

As a general rule, the TCP/IP parameters for the Series 90-70 TCP/IP Ethernet Interface will be applied in the following prcedence order:

1.If Logicmaster 90 configures the Ethernet Interface in TCP/IP Config Mode and this configuration information is passed from the PLC CPU through Soft Switches, the Logicmaster parameters will be used.

2.If Logicmaster configures the Ethernet Interface in MMS-Ethernet Config Mode and this configuration information is passed from the PLC CPU through Soft Switches, the GSM paramters will be used.

3.If the Ethernet Interface is in an unconfigured slot (no configuration in the PLC CPU, or Logicmaster configuration in the PLC CPU not showing an Ethernet Interface) and therefore not receiving soft switches, the Ethernet Interface will use the last set of TCP/IP parameters it received. This is true whether they originally came from Logicmaster or GSM. This will remain true through power cycles and Ethernet Interface restarts until either the Ethernet Interface receives Soft Switches from the PLC or until the Ethernet Interface is downloaded from the GSM.

4.If the Ethernet Interface is in an unconfigured slot and is downloaded from the GSM, the Ethernet Interface will assume MMS-Ethernet Config Mode and use the parameters from the GSM.

Note

For Logicmaster 90 to be able to use TCP/IP Config Mode, the PLC CPU must have firmware version 5.03 or later, and the Ethernet Interface firmware and software must be version 2.00 or later.

GFK-1004B Chapter 3 The GEnet System Manager±Station Configuration 3-23