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MELSEC-F
5 COMMUNICATION PROCEDURE
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
FROM BFM#1602
Open completion signal
BFM#20480
Power-on
Parameter
communication
completed
1)
2)
3)
4)
5)
FIN
SYN
SYN+ACK
Open allowed status
FIN+ACK
BFM#20482
0001H
8000H
0001H
(*1)
0005H
0000H
0005H
0003H
0000H
0009H
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
• Open completion signal (#BFM20480 b0)
: ON
• BFM#1602
: 0005
H
Data communication is enabled.
At abnormal completion
• 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 "0015
H
")
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.
Содержание FX3U-ENET
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