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MELSEC-Q
6 DATA COMMUNICATION USING THE NON PROCEDURE PROTOCOL
6.2.2 Arrangement and contents of the transmission area and the transmission data
This section explains the arrangement and contents of the transmission area and the
transmission data for performing data transmission using the non procedure protocol.
(1) Transmission area
The transmission area is a memory area for storing the data and the data count
that are transmitted from the PLC CPU to the external device via the Q series
C24. By default, the transmission area is assigned to addresses 400
H
to 5FF
H
(CH1 side) and 800
H
to 9FF
H
(CH2 side).
Buffer memory
Transmission data count
storage area
CH1 side
address
400
H
401
H
5FF
H
(Default setting)
The unit of transmission data count (words/bytes)
is in accordance with the word/byte units
designation in GX Configurator-SC.
The transmission data count designated with the
OUTPUT instruction is written.
The transmission data designated with the OUTPUT
instruction is written.
Transmission data
storage area
to
Transmission
area
•
•
•