7 - 3
MELSEC-F
FIXED BUFFER COMMUNICATION (WITH THE NO PROCEDURE
CONTROL METHOD)
7
7 - 3
(3) At data sending/receiving, the Ethernet module processes the following.
1) When sending data
The fixed buffer communication transmission request (writing "0001
H
" in
BFM#1610 to #1617) allows the fixed buffer data stored in the fixed buffer
data area (BFM#1664 to #9855) to be sent to the specified external
device (BFM#40 to #95).
(*1)
2) When receiving data
The Ethernet module processes the received data if it is received from an
external device set in the communication setting area that corresponds to
fixed buffer No. n.
(*1)
Also, when the Ethernet module stores the received data in the
corresponding fixed buffer in the receive processing, it updates the
destination IP address and destination port No. in the corresponding
fixed buffer connection information area (BFM#120 to #199)
If data is received from an external device not set in the connection
information area of the buffer memory, the Ethernet module ignores the
received data.
*1 In case of TCP/IP Unpassive open, data is communicated with an
external device stored in the connection information area of the buffer
memory.
