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10. COMMUNICATIONS IN THE BIDIRECTIONAL MODE
M ELSEC-A
(b)
User areas (OH to FFH and 120H to DFFH)
Address
OH
to
FFH
and
120H
to
DFFH
-
Name
Send data length storage area
Send data length storage
area
Received data length storage
area
Received data length storage
area
Description
The length (words or bytes) of data written to the send data storage
area, to be transmitted from the A l S J 7 1 C 2 4 to the computer, i s
designated with a TO instruction in a sequence program
The set value is used as it is to designate data length in a message
to be sent to the computer.
.
The unit of data length is determined by the value set at address
103H.
Set the send data length within the send data storage area length,
described below.
.........................................................
The data to be transmitted to the computer is designated with a TO
instruction in a sequence program.
The buffer memory length and length of the send data and send data
length storage areas are determined by the values set at 104H to
105H.
Default:
Send data iength storage area address : OH
Send data storage
area
address
: 1 H to 7FH
1
The data length in the message received from the computer is written
by an A1 SJ71 C24 a s i t is as the received data length.
Data lenath exwesses the number of wordslbvtes at the data section
-
in the message.
The unit of data length is determined by the value set at address
103H.
Transmit the data from the computer within the receive data storage
area length described below.
.........................................................
The data in the data section in the message received from a computer
is transmitted by the A l S J 7 1 C 2 4 as it is received.
The buffer memory length and length of the received data and
received data length storage areas are determined by the values set
at 106H to 107H.
Default:
Received data length stora area address
:
80H
Received data storage
area
address
: 81
H
to FFH
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