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MELSEC-Q
7 DATA COMMUNICATIONS USING BIDIRECTIONAL PROTOCOL
7.1.2 Arrangement and contents of the receive area and the receive data
This section shows the arrangement and contents of the receive area and the receive
data for performing data reception using the bidirectional protocol.
(1) Receive area
The receive area is a memory that stores the received data length (receive data
count) and data area received from an external device.
The receive area is allocated to addresses 600
H
to 7FF
H
(CH1 side) and A00
H
to
BFF
H
(CH2 side) at initial setting.
Buffer memory
Receive area
Receive data count storage area
Receive data storage area
CH1
address
600
H
601
H
7FF
H
(Default)
The units of data length (word/byte) is in accordance
with the word/byte units designation in GX Configurator-SC.
Data length
The contents of data length of the received
message are stored.
Data area
The contents of the data area of the received
message are stored in ascending address order.
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