Mitsubishi Melsec-L Series User Manual page 256

(d) Writing directly to the buffer memory
The following shows an example where the stored values in the TCP Maximum Segment Transmission setting
area and Communication condition setting (Ethernet Operation Setting) area is changed (when the I/O signals
of the E71 are X/Y00 to X/Y1F). Create a program with a contact (such as a flag for user) indicating the status
of the open completion signal storage area.
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Process upon completion
Process upon abnormal end
Communications enabled
Set TCP segment transmission
not to be performed.
Set "ASCII Code".
Set "Use the KeepAlive".
Set "IEEE802.3".
Set "Enable Online Change".
Set "Always wait for OPEN".
Request a reinitialization process.