Preparing Derivative Data Types To Use Cip Communications Instructions - Omron CJ1W-EIP21 Operation Manuals

8-2-5 Preparing Derivative Data Types to Use CIP Communications
Instructions
To use CIP communications instructions, you must prepare derivative data type variables to input com-
munications parameter settings in advance. Refer to the NJ-series CPU Unit Software User's Manual
(Cat. No. W501) for the specifications and setting procedures for the variables that are described in this
section.
Providing the Structure Variables to Input Request Paths
A CIP communications instruction combines all of the objects in a request path into a single structure
variable.
 Creating Structure Variables
To input a value into the structure variable of a CIP communications instruction, you must create a
user-defined variable with the same configuration in advance.
Example: Creating a Variable to Input Data to the CIPSend Instruction Array Variable Rq+Path
Create variable A with a _sREQUEST_PATH data type
with the same structure variable as Rq+Path.
Variable A
To create a variable in a variable table, select the pre-registered CIP communications instruction
data type _sREQUEST_PATH. This is a structure variable with the same configuration as Rq+Path.
Example:
Variable table
Variable name
Select the same data type as Rq+Path for the
data type of variable A.
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
CIP communications instruction
Rq+Path
Data type
8 Message Communications
Rq+Path Data Type
Member
ClasslD
InstancelD
AttributelD
Value
2
3
1
8
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