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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(b) Using the JM or QM commands (AnACPU dedicated commands)
esignation Method
1
St. No. :Station number
Designation in protocol I is shown below.
(1) To designate the device range, the following conditions must be
met:
I
Character area C
JM command 1
5
number of device points
5
40
I
;OmPUter
eQM command
1
r number of device points r 20
I
(2) With the QM command, word devices and bit devices (16-point
units) can be used in combination as shown in Example
2.
I
esignation Examples1
E
1J71 C24
-
Monitor data
(bit) command
.......
JM
Designates the head device when a bit
Example 1:
To register monitor data for X40, Y60, and TI23 (contact) in station number
"5".
(Message wait time is
0
rnsec)
I
Number of
device poi n ts
(2characten
(hexadecimal]
I
Check
sum
is calculated within this
range.
-
I I I I I I I I I I I I I I
I I I I I I I
I
I
I
, " , .
'
Devi c e
;
I
'
Devi c e
" , " , " &
(7
characters]
I
Bcharacten)
1
B
characters)
I
I
I
l
i
I
i
i
l
I
I
I
\
I
I I l I l i I
HIL
st.
No.
H I L
A
Indicates monitor registration in units of bits
1
":.
l : 0 . , s . 1 ; 6 , . , &
Monitor data registration (word) command
.....
QM
1
1
1
PC
No.
HIL
device is designated in units of words.
I
St.
No.
I
PC
NO.
J M
&
I
(Example: YO00060 for the range of Y60 to 6 0
HIL
erra age
waittime
HIL
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