10.
COMMUNICATIONS
IN
THE BIDIRECTIONAL
MODE
MELSEC-A
(2) Data transmitting procedure
Vocedure
(Check
.urn
disabled)
I
Computer
Send request
Y
(n+r)
0
Send completed XnO
1
Send data kngth
Turned
ONOFF
by
program
is
turned
ON
when
the
response
The
send completed signal
XnO
meesage
is
received.
POINTS
I
(1)
An
error occurs if the send data length is (a) greater than the send
area, or
(b)
equal to
"0".
In
this case, '1" is written as send error
information to the most significant bit (bit 15) of address 1 16H (data
send error storage area)
in
the special applications memory area
(see Sections 10.2 and 11.2).
(2) The send data length written to
the
head address is transmitted as
the data length.
I
Y
Li
7
/I
Y
10-24
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