Mitsubishi MELSEC Q Series Handbook

3 ETHERNET INTERFACE MODULE REPLACEMENT
3 - 35
(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
H
) in
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
instruction
Initial
normal
complete
signal
Connection
1
open complete
signal
Send
instruction
1PLS
BUFSND
instruction
complete
device
BUFSND
instruction failed
device
BUFSND
instruction failed
device
Processing for
normal completion
Processing for
error completion
Send
instruction
1PLS
Specify the setting data for
transmission processing
Transmission processing
by the connection 1.
Turn on the normal
completion flag.
Turn on the failed
completion flag.
Word length to send the
data
Send data
Send
data
setting
Send
data
setting
Send
data
setting
Data length
setting (No. of
words)
Data length
setting (No. of
words)
BUFSND
instruction
complete
device

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English