Omron Sysmac NJ-series User Manual

8-59
8 CIP Message Communications
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
8-6 Read and Write Services for Variables
8
8-6-1 Read Services for Variables
8-6 Read and Write Services for Variables
This section shows services that specify the CIP object in the Request Path and access the CIP mes-
sage server function of the NJ/NX-series Controllers.
Specify service code 4C hex to read the value of the variable that is specified by the request path.
 Request Data Format
* The actual data is stored in little-endian format.
8-6-1 Read Services for Variables
Service Code: 4C Hex
Data Type Code for data type of variable to read
Refer to 8-7-1 Data Type Codes.
AddInfoLength The size of the AddInfo area is stored only when accessing a structure variable. Set 02
hex for a structure variable. Otherwise, set 00 hex.
AddInfo The CRC code of the structure definition is stored only when accessing a structure vari-
able. In this case, the size of AddInfo will be 2 bytes.
Actual data The actual data is stored in little-endian format. If 0001 hex is specified for an array, the
actual data is stored in the same format as when you access a variable with the data
type of the elements of the array.
Request Path Data
Request Service Data
+0 Num of Element (L)
+1 (H)
Response Service Data
Data Type USINT
AddInfo Length USINT
(AddInfo)
Actual data*
Variable name specification
Specify the number of elements to read for an array variable.
Data type of variable to read
Additional information: Field length in bytes
Additional information: CRC value of structure
UINT

Omron Sysmac NJ-series Specifications

General

Brand	Omron
Model	Sysmac NJ-series
Category	Computer Hardware
Language	English