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3 .
LINKING TO THE A2CCPU
MELSEC-A
(2)
32-bit data (addresses 10 to 17)
A detected temperature value is multiplied by 1000 and represented in
the range from -180000 to 600000 of 32-bit signed binary numbers.
If a detected temperature value is negative, it is represented in a
complement of 2.
Example 1:
If a detected temperature value is 123.025"C (235.445"F), 123025 is
stored.
b31
I
24
23
-
16
15
8
7
-
bO
..
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 0 0 0 0 0 1 0 0 1 0 0 0 1
Example 2:
If a detected temperature value is -123.025"C (-1 89.445"F), -123025
is stored.
b 3 1
1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 1 0 1 1 0 1 1 1 1
-
24 23
I
16
15
8 7
-
bO
See Section
2.3.4
for detected temperature value.
3.4.5
Write data error code (address 18)
(1)
When data is read from the PC CPU, the A64RDC makes a data range
check for the number of channels, averaging count, and averaging time.
It
also performs a single read/write area access check.
If
any value is
outside the range, the A64RDC stores the error code in 16-bit binary.
Section 7.1 gives error code details.
(2)
If there is more than one error code, the first data error code detected
by the A64RDC is stored. The others are not stored.
(3) To reset an error code, write
0
from the PC CPU.
(4)
If an error is reset without correcting the error, the data error code is set
to
0
and the RUN LED of A64RDC stops flashing.
The error code can be reset by turning ON the error-detection reset (Yn+4).
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