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3 .
LINKING TO THE A2CCPU
MELSEC-A
3.4
Assignment
o f
the A64RDC Buffer
The assignment of the A64RDC buffer (without battery backup)
is shown
below.
Contents (16 bits)
0
Conversion-enabled/disabled specification
1
Averaging
specification
CH1 Averaging time/count
CH2 Averaging timehount
CH3 Averaging time/count
CH4 Averaging timelcount
I
6
I
CH1
Detected
temperature
value
I
7
I
CH2
Detected
temperature
value
I
8
1
CH3
Detected
temperature
value
I
9
I
CH4
Detected
temperature
value
CH1 Detected temperature value
(32 bits)
CH2 Detected temperature value
(32
bits)
(H)
CH3 Detected temperature value
( L )
(32
bits)
( H)
-
CH4 Detected temperature value
( L )
(32
bits)
(H)
-
I
' 8
I
Write
data
error
code
I
19
I
Conversion-completed
flag
I
2o
I
Type specification of a platinum
temperature-measuring resistor
ReadMrite area for use with a PC CPU
Readonly area for use with a PC CPU
Readhrite area for use with a PC CPU
Read-only area for use with a PC CPU
Readhrite area for use with a PC CPU
CAUTION
1
Addresses 6 to
17 and 19 of the buffer are exclusively used
for reading
from the PC CPU. Therefore, if the A64RDC writes data to these areas,
any data stored
in
these areas will be overwritten and destroyed.
In this
case, the A64RDC detects an error, stores the
error code in address
18,
and the RUN LED flashes.
3- 12
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