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2-54 TCP/IP Ethernet Communications for the Series 90™ PLC User's Manual
–
May 2002 GFK-1541B
2
Pinging TCP/IP Ethernet Interfaces on the Network
PING (Packet InterNet Grouper) is the name of a program used on TCP/IP networks to test
reachability of destinations by sending them an ICMP echo request message and waiting for a
reply. Most nodes on TCP/IP networks, including the Series 90-70 Ethernet Interface (Type 2),
implement a
PING
command.
The user should
ping
each installed Ethernet Interface. When the Ethernet Interface responds to
the
ping,
it verifies that the interface is operational and configured properly. Specifically it
verifies that acceptable TCP/IP configuration information has been stored to the Interface.
Pinging the Interface from a UNIX® Host or a PC Running TCP/IP Software
A
ping
command can be executed from a UNIX host or PC running TCP/IP (since most TCP/IP
communications software provides a
ping
command) or from another Ethernet Interface.* When
using a PC or UNIX host, the user can refer to the documentation for the
ping
command, but in
general, all that is required is the IP address of the remote host as a parameter to the
ping
command.
For example, at the command prompt type:
ping 10.0.0.1
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
Ethernet Interface with the same IP address as another node:
1. Disconnect your Interface from the LAN.
2.
Ping the disconnected Interface’s IP address. If you get an answer to the ping, then the
chosen IP address is already in use by another node. You
must
correct this situation by
assigning unique IP addresses.
* To use another GE Fanuc Ethernet Interface, refer to the PING command in GFK-1186,
TCP/IP Ethernet Communications for the Series 90 PLC Station Manager Manual
.
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