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6. PROGRAMMING
*
j
.
'
L
MELSEC-A
Unless otherwise specified,
I/O numbers used in thes manual assume that the
AiSD71 is
located at
slot
0
and 1 of the main base.
I
Used
numbers: X0 to
2F,
For details, refer to Table
YO to
2F
3.9.
Fig. 6.1 AlSD71 Location for the Following Examples
The number of devices (M, D, T, etc.) used in the program example can be changed freely.
POINTS
1
(1)
There are 48 A1 SO71 input/output points and the module occupies
two slots. Therefore, execute I/O allocations using the GPP function
as follows:
First half
slot
.............
Empty slot
: 16 points
Second half slot
.........
Special-function module :32 points
number of the second half slot
of
AlSD71 is used.
(2)
When executing an AlSD71 FROM/TO instruction, the head I/O
Therefore, the number to be set by the FROM/TO instruction
be-
comes the head I/O number allocated to the AlSD71
+
0 1 0 ~ .
(3) If
the first half A I SD71 slot is set to empty slot 0 in the I/O allocation
by the GPP function, 16 first half slot points are saved.
The I/O number to be set in the FROM/TO instruction becomes the
same number as the first
I/O
number allocated to the AlSD71.
6 - 2
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