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7 - 2
FIXED BUFFER COMMUNICATION (WITH THE NO PROCEDURE
CONTROL METHOD)
7
7 - 2
7
MELSEC-F
(2) Data can be communicated with the following external devices.
• Device on the Ethernet to which the Ethernet module is connected.
• Devices connected with the router relay function (see Section 5.3)
As shown in the diagram below, when using each fixed buffer (No. 1 to 8), the
destination devices and usage conditions (for sending/receiving, procedure exist/
no procedure, etc.) should be set when the connection via the Ethernet module is
opened to fix the external device for each buffer.
(a) At TCP/IP communication
It is allowed to change external devices only when the open completion
signal of the applicable connection is off.
(b) At UDP/IP communication
External devices can be changed regardless of the status of the applicable
connection.
("Destination IP address" and "Destination Port No." in the communication
address setting area can be changed. However, "Local station Port No."
cannot be changed.)
When changing external devices, do not use the "Pairing open" and
"Existence confirmation" functions.
POINT
The connections for which no procedure is selected are dedicated to the fixed
buffer sending or receiving after the completion of open processing.
For sending to external
device 1
For receiving from external
device 1
For receiving from external
device 8
For sending to external
device 28
External device 1
External device 8
External device 28
Fixed buffer No. 1
Fixed buffer No. 2
Fixed buffer No. 3
Fixed buffer No. 8