Mitsubishi MELSEC-F User Manual page 127

6 FIXED BUFFER COMMUNICATION (WITH THE PROCEDURE EXIST
CONTROL METHOD)
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1) Confirm the normal completion of the initial processing.
2) Confirm the normal completion of the open processing of connection
No. 1
3) Write the send data word count and the send data in the fixed buffer
data area (communication address setting area: BFM#1664 to 2687)
by TO instruction.
4) Write "0001
(BFM#1610).
5) The size of send data in the fixed buffer (No. 1) area designated by the
send data length is sent to the designated external device (set in the
open processing).
The value in BFM#1610 becomes "0002
6) Upon receiving the data from the Ethernet module, the external device
returns a "Response" to the Ethernet module.
7) Upon receiving the "Response" from the external device, the Ethernet
module ends the data transmission.
If the "Response" is not returned within the response monitoring time
values (see Section 5.2), a data send error occurs.
At normal completion
Fixed buffer transmission result (BFM#1610)
At abnormal completion
Fixed buffer transmission result (BFM#1610)
If the data transmission is abnormally completed, execute the send
process again writing "0001
POINT
The destination setting (see Section 5.5) for a connection whose parameters are
set in FX Configurator-EN (GX Developer) becomes valid when the open
completion signal (BFM#20480 corresponding bit) of the Ethernet module switches
from off to on.
The setting also becomes valid when the each value in BFM#1602 to 1610 is
"0005 " for Connection No.1 to 8.
H
" in the fixed buffer communication transmission request
H
" in BFM#1610.
H
MELSEC-F
".
H
: 0004
H
: 0008
H
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