Mitsubishi Electric Q03UDVCPU User Manual page 183

(1) How to use
For the settings of IP packet transfer function or how to use the function, refer to the following.
Manual for the CC-link IE Controller Network module used
Manual for the CC-link IE Field Network module used
(2) Precautions
• The data that are communicated using the IP packet transfer function are communicated separately by the
following processing.
• Service processing by a sequence scan of a CPU module
• Link scan on CC-Link IE Controller Network
• Link scan on CC-Link IE Field Network
The above processing causes communication speeds to be slower than Ethernet lines. Manuals for the CC-
Link IE Controller Network module or CC-Link IE Field Network module describe targeted communication
speeds when the IP packet transfer function is used.
• Broadcast communication and multicast communication cannot be performed with the IP packet transfer
function. Perform unicast communication (communication with one request destination specified).
• If the application timeout of the request source device occurs due to a heavy communication load on the
path that an IP packet takes, measure the response time using the ping command from the request source
device and adjust the application timeout time.
• Data size must be within 1460 bytes when the ping command is used.
• UDP provides less reliable data communications compared with TCP and thus data may be lost or arrive out
of order. Use TCP communications if a problem occurs with the UDP communications.
CHAPTER 12 IP PACKET TRANSFER FUNCTION
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