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MELSEC-F
COMMUNICATION PROCEDURE5
5 - 36
*1 If an open request (SYN) received after the normal completion of an
initial processing and before the Ethernet module is placed in the open
acknowledge enabled status, an error is generated, and the Ethernet
module sends a connection forced close (RST).
1) After communicating the parameter settings, confirm the normal
completion of the Ethernet module initial processing.
(Initial normal completion signal (BFM#27 "0001
H":)
2) Start the open processing by writing "0001
H" to the BFM#1602.
(Open request signal (BFM#20482 b0) : ON
3) OPEN possible (Listen status) from external device. (Open/close status
BFM #1602 "0003
H")
4) The Ethernet module starts the open processing upon receiving the open
request (SYN) from the external device.
At normal completion
Data communication is enabled.
At abnormal completion
5) The Ethernet module starts the close processing upon receiving the
close request (FIN) from the external device.
When the close processing is completed, the open completion signal
turns off and data communication is disabled.
• Open completion signal (#BFM20480 b0) : ON
• BFM#1602 : 0005
H
• Open completion signal : OFF
• The open error code is stored in the buffer memory
• Open abnormal detection signal (BFM28 b6) : ON
• OPEN/CLOSE instruction status (BFM#1602 "0010
H" or "0015H")
Open status
Open allowed status (closed)
(Active open acknowledge
enabled)
Closed status
Initial normal completion
BFM#27="0001
H"
OPEN/ CLOSE operation
TO BFM#1602
OPEN/ CLOSE status
FROM BFM#1602
Open completion signal
BFM#20480
Power-on
Parameter
communication
completed
1)
2)
3)
4)
5)
FINSYN
SYN+ACK
Open allowed status
FIN+ACK
BFM#20482
0001
H 8000H 0001H
(*1)
0003
H0000H0005H0003H0000H
0009
H