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Ethernet Communications Section 7-3
7-3 Ethernet Communications
This section provides a description and example of connection to an OMRON
Standard PLC. Connection can be performed to an OMRON Standard PLC
using the FINS/UDP protocol.
Note • Only CP1W-CIF41 Ethernet Option Boards with unit version 2.0 or later
can be used. If another Option Board is used, the G9SP-series Controller
will detect an Unsupported Option Board Error (the MS indicator will flash
red).
• Use 1:1 communications (i.e., send commands from only one device).
If you use n:1 communications (i.e., if you send commands from n
devices), the CP1W-CIF41 will receive multiple commands simulta-
neously, and some commands may be discarded.
• The UDP/IP protocol does not execute any controls to ensure the reliabil-
ity of communications. Therefore, if you use the FINS communications
service with UDP/IP, messages that are sent may not always reach the
destination node. It is therefore necessary to perform retry processing or
other processing in the user application to increase reliability.
• If you connect many devices on the same Ethernet network, the Ethernet
network load (network congestion) may temporarily increase.
If command transmissions overlap when the Ethernet network load (net-
work congestion) is high, the CP1W-CIF41 may discard commands.
Reduce the number of devices on the same Ethernet network or increase
the number of retries for the send command.
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