A-57
Appendices
NY-series Industrial Panel PC / Industrial Box PC Built-in EtherNet/IP Port User’s Manual (W563)
A-5
V
ariable Memo
ry
Allocat
ion
Meth
od
s
A
A-5-
1 V
ar
iable Memor
y Allocation Rules
Example: The alignments and the amounts of memory that are allocated for the four variable declara-
tions given in the following figure are given in the following table.
Variable
Alignment [bytes]
Amount of memory that is allocated [bytes]
E
2
4
F
2
4
G
2
8
H
2
8
Data Type Definitions
Name
Structure
STR_C
a
b
Data type
STRUCT
ARRAY[0..7] OF BOOL
BYTE
Variable E,
4 bytes
Variable F,
4 bytes
Variable G,
8 bytes
Variable H,
8 bytes
E.a[0] to E.a[7]
E.b
F.c
F.d[0] to F.d[7]
G[0].a[0] to G[0].a[7]
G[0].b
G[1].a[0] to G[1].a[7]
G[1].b
H[0].c
H[0].d[0] to H[0].d[7]
H[1].c
H[1].d[0] to H[1].d[7]
Bytes
Memory
First byte
First byte + 1
First byte + 2
First byte + 3
First byte + 4
First byte + 5
First byte + 6
First byte + 7
First byte + 8
First byte + 9
First byte + 10
First byte + 11
First byte + 12
First byte + 13
First byte + 14
First byte + 15
First byte + 16
First byte + 17
First byte + 18
First byte + 19
First byte + 20
First byte + 21
First byte + 22
First byte + 23
Variable Table
Name
Variable E
Variable F
Variable G
Variable H
Data type
Structure
STR_C
Structure
STR_D
ARRAY[0..1] OF STR_C
ARRAY[0..1] OF STR_D
Name
Structure
STR_D
c
d
Data type
STRUCT
BYTE
ARRAY[0..7] OF BOOL
First byte +
(integer multiple of 2)
First byte +
(integer multiple of 2)
First byte +
(integer multiple of 2)
First byte +
(integer multiple of 2)
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Not used.
Summary of Contents for Sysmac NY512-1300
Page 459: ......
