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10. COMMUNICATIONS IN THE BIDIRECTIONAL MODE
MELSEC-A
(b) User areas
(OH to
FFH
and 120H to 7FFH)
-
hddress
O H
to
FFH
and
120H
to
7FFH
-
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 AJ71C24 to the computer, is desig-
nated with
a
TO instruction in a sequence program
The set value is used as i t 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.
-..-..-.s-.--.--..-....--..--.--.--...-...--.
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 length storage area address : OH
Send data storage area address
: 1 H t o 7 F H
I
8
The data length in the message received from the computer is written
by an AJ71C24 as it is as the received data length.
Data length expresses the number of wordslbytes at the data section
in the message.
8
The unit of data length is determined by the value set at address
InAH
8
Transmit the data from the computer within the receive data storage
area length described below.
The data in the data section i n the message receivedfrom a computer
is transmitted by the AJ71 C24 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
: 81H to FFH
I
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