Mitsubishi MELSEC-F User Manual page 113

5 COMMUNICATION PROCEDURE
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Power-on
Open status
Open allowed status (closed)
(Active open acknowledge
enabled)
Closed status
Initial normal completion
BFM#27="0001H"
OPEN/ CLOSE operation
TO BFM#1602
OPEN/ CLOSE status
0000H
FROM BFM#1602
Open completion signal
BFM#20480
Open allowed status
BFM#20482
1) After communicating the parameter settings, confirm the normal
completion of the Ethernet module initial processing.
(Initial normal completion signal (BFM#27 "0001
2) Start the open processing by writing "0001
(Open request signal (BFM#20482 b0) : ON
3) OPEN possible (Listen status) from external device. (Open/close status
BFM #1602 "0003
4) The Ethernet module starts the open processing upon receiving the
open request (SYN) from the external device.
At normal completion
• Open completion signal (#BFM20480 b0)
• BFM#1602
Data communication is enabled.
At abnormal completion
• Open completion signal
• The open error code is stored in the buffer memory
• Open abnormal detection signal (BFM28 b6)
• OPEN/CLOSE instruction status (BFM#1602 "0010
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.
POINT
This example uses connection number 1 for explanation. Use the appropriate BFM
signals and bits for other connection numbers.
Parameter
communication
completed
1)
(*1)
2)
0001H
3)
0003H 0005H
SYN+ACK
4)
SYN
")
H
8000H 0001H
0009H 0000H
FIN+ACK
5)
FIN
":)
H
" to the BFM#1602.
H
MELSEC-F
0005H
: ON
: 0005
H
: OFF
: ON
" or "0015 ")
H H
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