6 - 6

MELSEC-F
FIXED BUFFER COMMUNICATION (WITH THE PROCEDURE EXIST
CONTROL METHOD)
6

6 - 6

6.3 Receiving Control Method

This section explains the control method when the Ethernet module receives data

from an external device.

6.3.1 Receive processing with the main program

This section explains the receiving process to be performed with the main program,

using an example in which the fixed buffer No. 2 and the area corresponding to

connection No. 2.

• Program example for the unit No. 0
M8000
[BMOV D1000 D101 ]
[MOV D101 ]
[MOV D100 ]
[MOV H2 ]
[= D100 H1 ]
[= D100 H8 ] [INCP D102 ]
]
[END
* <<Storing the data received from the external device to the fixed buffer No.2 in D1000 and later>>
* <Receiving status
* <Obtaining received word count
* <Read of received data
* <Write of receiving completion
* <Receiving failed
>
>
>
>
>
U0
G1611
U0
G2688
U0
G1611
U0
G2689
Receive abnormal processing
User applications are described at the area enclosed with .

ACK

(only TCP)

5)

Response

ACK

(only TCP)

2)

Data receiving

W
0002H
Initial processing normal
completion
OPEN/CLOSE instruction status
BFM #1602=0005H
Received word count and
received data written to PLC FROM instruction
Fixed buffer received status and
received completion message
BFM #1611
R
0001H
R
0004H (Success)/0008H (Error issued)
Initial
processing
Open
processing
Response
sending
Data
receiving

1)

3) 4)

6)