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FIXED BUFFER COMMUNICATION (WITH THE PROCEDURE EXIST
CONTROL METHOD)
6
6 - 2
6
MELSEC-F
(3) At data sending/receiving, the Ethernet module processes the following.
(a) When sending data
In response to the fixed buffer communication transmission request (write
"0001
H" to BFM #1610, #1611), the Ethernet module sends the data of the
fixed buffer stored in the fixed buffer area (BFM #1664 to 3711) to the the
specified external device (BFM #40 to 53).
(*1)
(b) When receiving data
The Ethernet module processes the received data if the data is received
from an external device set in the communication setting area that
corresponds to fixed buffer No. n.
(*1)
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 to the PLC side.
*1 In case of TCP/IP Unpassive open, data is communicated with an
external device stored in the connection information area corresponding
to fixed buffer No. n.
POINT
In communication where the procedure exist control method is selected, the data
can be communicated by the following methods after the open processing is
completed.
• Fixed buffer communication with the procedure exist control method (sending or
receiving)