Mitsubishi Electric MELSEC-L Series - Broadcast Communications; Sending;Receiving Procedures

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CHAPTER 12 COMMUNICATIONS USING A FIXED BUFFER
12
12.8 Broadcast Communications 12.8.1 Sending/receiving procedures
12.8 Broadcast Communications
Broadcast communications mean that the same data is sent to all E71-connected stations in the same Ethernet
network and to the connected devices without specifying destinations. Broadcast communications can be performed
when the following conditions are met.
• When UDP/IP protocol is used
• When "No Procedure" communications using a fixed buffer or data communications using the predefined
protocol are performed
● When connected devices in the same Ethernet network do not need to receive communication messages by broadcast
communications, a discarding process is required.
● The user needs to determine the port numbers dedicated for data sending/receiving for broadcast communications.
● Sending/receiving procedures to perform the broadcast communications in communications using the predefined
protocol are same as that in communications using a fixed buffer except for setting "Predefined protocol" under "Fixed
Buffer Communication" of the open setting.
12.8.1 Sending/receiving procedures
(1) Sending procedure
To send data by broadcast communications, set the IP addresses of the connected devices where the E71 sends
data to FFFFFFFF
H
and perform the open process. The E71 sets all the host address bits to 1 and sends data
over the Ethernet network.
(2) Receiving procedure
To receive data as data for broadcast communications, set the IP addresses of the connected devices that send
data to the E71 to FFFFFFFF
H
and the port numbers to FFFF
H
and perform the open process.