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4. COMMUNICATIONS USING A DEDICATED
PROTOCOL
MELSEC
QnA
4.1 . I QnA frame format 1 control Drocedure and message structure
Control procedure an external device reads PC data
(a) Word units read
(Example) Use command 0401 (device memory batch read) to read the contents of
PC CPU data registers DO to D2.
Transmisslon
s
Character
area
A
(Read device range designation)
I
c
u
o
0
5
device
I
I
I
I
I
I
l
l
I
l
l
I
I
I
I
I
I
1
1
1
I
+
(barnpie)
F19
010 010
F I F
010
0141011
0101010
DI*01010101010 0101013
011
Character
area
B
05 4 ! 3 9
3 0 ! 3 0
a6!&
30!X
30!24!30!31
3 C ! Q ! 3 0 ! 3 0 M ! 2 A
30!30!30!30!U!X 30!30!30!U X ! 3 '
(Data name)
AJ71 QC24
(Example)
Designates
the three
F19
010 010
F I F
81E
1101310
1121012
1191915
010
s g 7 m
T
z
g
p
T
device points count
8
r
3
o m
5
P
reception)
,ZT
correspondmg to
: E
0
s
(Normal
3 E
g3
x
(number
of
characters
z
8
2
a
x
2.2
0s
E
Data corresponding to
Batch read
0
$
device points count)
I
I
1
1
1
1
1
1
1
1
1
I
I
I
I
points Do to D2'
C Z
A6!39
38!li
03
31!30!33!X
31!32!%!32
31!39!39!35
30!30
X!30
3 0 ! 3 0
01
1
D2= i
0 3 0 ~
(Recelve error)
When error
code returned.
4 - 4
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