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7. FIXED BUFFER EXCHANGE WITHOUT PROCEDURE
7.3 Simultaneous Broadcast Communication When Using UDP/IP
When UDP/IP is used to conduct fixed buffer exchange without procedure, a simultaneous broadcast
to all QE71 installation stations connected to the same Ethernet as the QE71.
This makes it possible to write, etc., the same data to all stations.
Point
(1) For simultaneous broadcast communication, the remote node connected to the same Ethernet
(2) For simultaneous broadcast communication, the user arranges the simultaneous broadcast
7.3.1
When conducting open processing for the partner remote node IP address to which data will be sent
as FFFFFFFFH, simultaneous broadcast communication transmission can be conducted. During si-
multaneous broadcast communication transmission, the QE71 changes the host address bits to all
"1", and transmits the data on the Ethernet.
(Example) When connection 1 is used
In the above case, the QE71 changes the host address bits to all "1" and the request destination port
No. to the remote No. to transmit data in the fixed buffer.
is required to get rid of reading when the received message by simultaneous broadcast is not
necessary.
transmission, reception special port No., and specifies the port No.
Simultaneous Broadcast Communication Transmission
Buffer memory
Address
20H(32)
to
28H(40)
QE71 Port No.
29H(41)
2AH(42)
Remote node port No.
2BH(43)
Set without procedure,
0300H
UDP, and for transmission.
to
FFFFH
Makes the remote node IP address
to a simultaneous broadcast address.
FFFFH
Makes the remote node port No. to
the simultaneous broadcast port No.
(arranged by the user)
7 - 8
MELSEC-QnA
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