Mitsubishi MELSEC Q Series Handbook page 88

3
ETHERNET INTERFACE MODULE REPLACEMENT
(2) Q series
[Transmission processing]
The Q series uses the dedicated instruction (BUFSND) to perform data transmission from the fixed
buffer to an external device.
[Reception processing]
On the Q series, the fixed buffer reception status signal (corresponding bit of address 5005
buffer memory turns ON when data is received to the fixed buffer area.
The Q series uses the dedicated instruction (BUFRCV) to perform data reception.
(a) Program condition
The following shows a program example for performing transmission processing by fixed buffer No.1
when the transmission instruction (M7000) is turned ON.
(b) Program example
Send Initial Connection
instruction normal 1
complete open complete
signal signal
Send
instruction
1PLS
BUFSND
BUFSND
instruction
instruction failed
complete
device
device
BUFSND
instruction failed
device
3
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Send
instruction
1PLS
Specify the setting data for
transmission processing
Word length to send the
Data length
data
setting (No. of
words)
Send data
Send
data
setting
Send
data
setting
Send
data
setting
Transmission processing
BUFSND
Data length
by the connection 1.
instruction
setting (No. of
complete
words)
device
Turn on the normal
Processing for
completion flag.
normal completion
Turn on the failed
Processing for
completion flag.
error completion
) in
H