Mitsubishi MELSEC LJ71C24, User Manual

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11 DATA COMMUNICATION USING THE BIDIRECTIONAL PROTOCOL
11.2.2 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 bidirectional protocol.
For details on the contents of transmission data, refer to Section 11.1.2 (3).
(1) Transmission area
The transmission area is a memory area for storing the data and the data count
that are transmitted from the CPU module to the external device via the 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).
400
H
401
H
5FF
H
CH1 side
address
(Default)
to
Buffer memory
T
ra
nsm
issi
on
area
Transmission data count
designation area
Transmission data
designation area
The unit of transmission data count
(words/bytes) is in accordance with the
word/byte units designation in GX Works2.
Transmission data count
The transmission data count designated with the
BIDOUT instruction is written, and sent as the
data length.
Transmission data
The transmission data designated with the
BIDOUT instruction is written and then sent.
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•
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