Omron SYSMAC CJ1W-EIP21, Operation Manuals

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Appendices
A-22
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)

Method 2: Changing the Memory Configuration of the Structure Variable in
the Remote Device
You can insert a member into the structure variable of the remote device to change it to match the
memory configuration of the structure variable in the NJ-series CPU Unit. Both the memory configu-
ration and the data types must be the same between the two structure variables. You therefore need
to create the same members in both the remote device and the NJ-series CPU Unit.
Example: The following example shows how the memory configuration of the structure variable in
the CJ-series CPU Unit is changed to match the memory configuration of the structure variable in
the NJ-series CPU Unit.
a
b
b2
c
a
b
b2
c
a
b
c
Data Type Definitions
Name
Structure Y
a
b
b2
c
Data type
STRUCT
DINT
INT
INT
DINT
Bytes
CJ-series Structure Variable CJ_X
First byte
First byte + 4
First byte + 6
First byte + 8 Variable Table
Name
Variable CJ_X
Data type
Structure Y
Data Type Definitions
Name
Structure Y
a
b
b2
c
Data type
STRUCT
DINT
INT
INT
DINT
Bytes
NJ-series Structure Variable NJ_X
First byte
First byte + 4
First byte + 6
First byte + 8 Variable Table
Name
Variable NJ_X
Data type
Structure Y
Data Type Definitions
Name
Structure Y
a
b
c
Data type
STRUCT
DINT
INT
DINT
Bytes
CJ-series Structure Variable CJ_X
First byte
First byte + 4
First byte + 6
Variable Table
Name
Variable CJ_X
Data type
Structure Y
Data Type Definitions
Name
Structure Y
a
b
c
Data type
STRUCT
DINT
INT
DINT
Bytes
a
b
Not used.
c
NJ-series Structure Variable NJ_X
First byte
First byte + 4
First byte + 6
First byte + 8
Variable Table
Name
Variable NJ_X
Data type
Structure Y
(2) Add the dummy variable b2 that you created in the
CJ-series CPU Unit to the NJ-series CPU Unit as well.
(1) Add a dummy member variable b2 that matches the
unused memory location on the NJ-series CPU Unit.
Make the following changes to align the memory
configurations in the NJ-series and CJ-series CPU Units.