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Chapter 4. Configuration
50 PACSystems* RX7i & RX3i TCP/IP Ethernet Communications User Manual GFK-2224Q
must be identified by its globally unique MAC address. The Ethernet Interface’s MAC address is specified on its
MAC Address Label as described in Chapter 2, Installation.
The BOOTP server must not be separated from the PACSystems Ethernet Interface by a router. BOOTP uses
broadcast messages, which typically do not pass through routers. Consult your network administrator for more
details.
Caution
The temporary IP address set by BOOTP is not retained through a power cycle.
To set a permanent IP Address, you must configure the Ethernet Interface’s IP
Address at the programmer and download the hardware configuration to the
PLC.
Redundancy systems using should explicitly configure both the direct IP address and the Redundant IP address.
For redundancy operation, do not set up the direct IP address via BOOTP.
Assigning a Temporary IP Address Using Telnet
The temporary IP address assignment performed by the programmer’s Set Temporary IP Address utility can be
performed manually from a computer’s DOS command window if the programming software is not available.
This method uses an attempted Telnet connection to transfer the IP address, even though the PACSystems
target Ethernet Interface does not support normal Telnet operation.
Caution
The Telnet method can assign a temporary IP address whether or not the
Ethernet Interface already has in IP address, even if the Ethernet interface has
been previously configured to a non-default IP address. (This includes overriding
an IP address previously configured by the programming software.)
Use this IP Address assignment mechanism with care.
To temporarily set the IP address over the network, the PLC CPU must not be running. IP address assignment
over the network will not be processed until the CPU is stopped and is not scanning outputs.
1. Obtain the Ethernet Interface’s MAC address from its MAC Address Label as shown in Chapter 2,
“Installation.”
2. On the computer, open a standard DOS command window. Associate the desired IP address for the
Ethernet Interface with the MAC address of the Ethernet Interface using the following method. In the
DOS command window, enter:
> ARP –s ip_address mac_address
for
ip_address
enter the IP address being assigned to the Ethernet interface, and for
mac_address
enter the
MAC address of the Ethernet interface.
3. Issue a Telnet command to the IP address (
ip_address
) being assigned to the Ethernet interface via the
following command:
> telnet ip_address 1
(This command is always sent to port 1.) This Telnet command will fail, but the IP address provided with the
Telnet command will be passed to the Ethernet interface and will be temporarily activated.
The IP address assigned over the network remains in effect until the Ethernet interface is restarted, power-
cycled or until the configuration is downloaded or cleared. Once connected, the intended IP address should be
permanently downloaded to the Ethernet interface via the hardware configuration data.