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MELSEC-Q
6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
2) Reception by received data count
When the received data count is set larger than the receive data storage
area, the receive buffer memory length (default: 512 words) -1 set in buffer
memory addresses A7
H
/147
H
is processed as the received data count.
(Receive data storage area) > (Data length received from external device)
(Example) When 550 words of data is received through the CH1 interface
in three parts when the CH1 interface receive area consists of
addresses 600
H
to 7FF
H
(default value)
External device
Reception data read
request signal
X3
511 words
Sequence program
INPUT
INPUT
39 words
INPUT
472 words
78 words 433 words 117 words
1st data 2nd data 3rd data
Read data....
1st 511 words
Read data....
1st 39 words and
2nd 472 words
Q series C24