Omron CJ1W-EIP21 User Manual

A-17
Appendices
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
A-4 Variable Memory Allocation Methods
App
A-4-1 Variable Memory 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]
E2 4
F2 4
G2 8
H2 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.

Omron CJ1W-EIP21 Specifications

General

Brand	Omron
Model	CJ1W-EIP21
Category	Controller
Language	English