Communications Test; Ping Command - Omron CP1L-EL20DR-D Operation Manual

Basic Setting for Ethernet
6-4-4

Communications Test

PING Command

Note (1) Make settings using the PLC settings function in the CX-Programmer (to
be included in version 9.4 and higher).
(2) For details, refer to 2-9 Basic Settings in the Ethernet Units Construction
of Networks Operation Manual (Cat. No. W420-E1).
If the basic settings (in particular the IP address and subnet mask) have been
made correctly, then it should be possible to communicate with nodes on the
Ethernet.
The following describes how to use the PING command to perform communi-
cations testing between CP1L-EL/EM series PLCs.
The PING command sends an echo request packet to a remote node and
receives an echo response packet to confirm that the remote node is commu-
nicating correctly. The PING command uses the ICMP echo request and
responses. The echo response packet is automatically returned by the ICMP.
The PING command is normally used to check the connections of remote
nodes when configuring a network. The PLC supports the ICMP echo reply
functions.
If the PLC returns a normal response to the PING command, then the remote
nodes are physically connected correctly.
CP1L-EL/EM
SYSMAC
CP1L
COM 01 03 05 07
NC 00 02 04 06
POWER
RUN
ERR/ALM
INH
LNK/ACT
BKUP
1
00 01 02
ANALOG INPUT
COM(V+)
V1+ V2+ COM
MAC Address:
01234567890A
The PLC automatically returns the echo response packet in response to an
echo request packet sent by another node (host computer or other Ethernet
Unit).
09 11 01 03 05 07 09 11
08 10 00 02 04 06 08 10
2
03 04 06 00 01 03 04 06
COM 05 07 COM 02 COM 05 07
Echo response
Echo request
Section 6-4
Remote Node
(host computer or Ethernet Unit)
TCP UDP
ICMP
IP
Ethernet
171