Support for the IP packet transfer function
MELSEC iQ-R series modules support the IP packet transfer function from the first release.
To check whether other modules support the IP packet transfer function, refer to the following.
User's manual for the module used
Using different networks
Communications cannot be performed via modules that do not support the IP packet transfer function such as MELSECNET/
Communications before a baton pass is established (D LINK LED off)
The IP packet transfer function can be used after a baton pass was established. If communications are performed before that,
a timeout error occurs in an Ethernet device (request source device). Whether the baton pass is established in the own station
can be checked on the D LINK LED.
Precautions when using the UDP communication
Using UDP may reduce the reliability of data communications compared to TCP, causing a problem, such as data missing and
changed order of data receiving. If any problem occurs, change the protocol to TCP.
Communications of Broadcast and Multicast
Communications of Broadcast and Multicast cannot be transferred using the IP packet transfer function. Use Unicast
(identifying a single request destination) instead.
1.5 IP Packet Transfer Function