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8. COMMUNICATIONS USING DEDICATED PROTOCOLS
MELSEC-A
(3) Monitoring device memory in units of bits
(a) Monitoring the devices registered by the BM command (ACPU
common command)
esignation Method
I
Designation in protocol 1 is shown below.
Monitor (bit) command
I
St. No. :Station number
/
The number of characters forthe number
of paints designated
by
monitor registration (BM)
OFF when the value is 0 (30H)
ON when the value is 1 (31 H)
esignation Example/
Monitoring is executed after registering the monitor data (bit units) in Example
1
of
(2)
(a)
(Message wait time is
0
msec)
1 1
Indicates that TI23 (contact) is ON.
Check sum is calculated
within this range.
.
/
Indicates that
Y60
is OFF
Indicates that X40 is ON.
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I
I
A
c
K
M"
Computer
6
E
0
6
yl",U*
AJ71 C24
O
~
F
F
( 6 + .
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s
X
0"
8%
T
O
S
F
F
!4",,5"
2
Check sum is calculated
within this range.
,&,*"
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0
1
3 , ~
,
3"
,
3,"
E
X
11"
T
S
6
j e s , s w
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