IO.
COMMUNICATIONS
IN
THE
BIDIRECTIONAL
MODE
MELSEC-A
Address
112H
113H
114H
11%
116H
117H
-
N.M
Bidiroctional mode derigne
tion area
Time-out check time designa-
tion area
Data valid/invalid designation
area
at
simultaneous transmir-
sion
Bidirectional mode chock rum
onable/dirable designation
aroa
Error storage area for data
send
Error storage area for data
received
(continued)
Dostription
Whether the interface communicationr mode
is
no-protocol or bidirec-
tional
is
dmignatod with
a
TO instruction in a sequence program.
0:
No-protocol mode (default)
1
:
Bidirectional mode
The time-out check time (until the reception of a response after tranr-
mission
of
data to the computer) is designated with a TO instruction in
a rsquence program.
OH
:
Timeout
is
not checked (defauit)
1 H to FFFFH
:
Time-out check time
(1
00
msbc units)
The mort significant bit in the area is not regarded as
the sign
bit.
The set value is regarded to derignate
valuo
in
the range
of
1 through
$5535.
e
How tho receive and send data at an AJ71C24 is procowed
if
data
tranrmirrion at a computer and an An1 C24 occur8 simultaneourly
ir
derignated
with
a TO instruction on a sequence program.
(Section 10.6 covers silmultaneous transmission)
114H[-1 (default
OOOH)
blS
b
Wb7
lp
bo
--
L
L
me
data
(w:
va~,
OIH:
Invdid)
Send data
(OOH:
valid, 01 H:
Invdi
Whether
or
not check sum is appended for bidirectional mode com-
munications is designated with a TO instruction in a sequonca pro-
gram.
(This designation is not related to the setting
of
DIP
witch SW21.)
0:
Check rum onabled (default)
1
:
Check rum disabled
0
If
an error occurs during data communications, the error code is
tranrmitted
by
an AJ7lC24.
(The area designated in 117H retains the error code of the
Id
data
receive error.)
OH
:
Normal termination (no
error)
}
:
Abnormal termination (error)
w83H Section 11.2 gives error code details.
POINT
I
The area described above is the special applications area
for
bidirectional
mode communications.
For other special applications areas used
for
data communications, see
Section
3.5,
section
5,
and section
7.
I
c
,-.-
...
d
r3
4
h
Y
10-6
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