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MELSEC-F
FIXED BUFFER COMMUNICATION (WITH THE PROCEDURE EXIST
CONTROL METHOD)
6
6 - 3
6.2 Sending Control Method
This section explains the control method when data is sent from the Ethernet module
to an external device using the fixed buffer No. 1 and the area corresponding to
connection No. 1 as an example.
•For FX
3U/FX3UC Series PLCs
Program example for the unit No. 1
X002
M200
D101.2
D101.3
* <<Sending 32 words from D1000 to the external device>>
D1000[BMOVP K32 ]
[MOVP K32 ]
[MOVP H1 ]
[MOV D101 ]
(M201 )
(M200 )
(M202 )
[END ]
M201 M202
Send
instruction
Transmission
normally
completed
Transmission
abnormally completed
Send instruction
(Self-holding)
Send
instruction
(Self-holding)
Number of
send words
in the fixed
buffer No.1
U1\
G1664
U1\
G1665
U1\
G1610
Value of
BFM#1610
Value of
BFM#1610
Head of
send data
Fixed
buffer No.1
U1\
G1610
Transmission
request/status
Value of
BFM#1610
Transmission
request/status
Transmission
normally
completed
Transmission
abnormally
completed
M8000
[MOV K4M300 ]
* <<Reading the status of Ethernet module>>
U1\
G28
Initial
completed
M300 M307
[= H5 ]
Initial
completed
HUB
connection
completed
OPEN
instruction/status
U1\
G1602