Omron Sysmac NJ-series User Manual

8 CIP Message Communications
8-40
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
This section shows how to specify messages to access CIP objects.
The CIP objects to access are expressed by connecting the segments that are defined in the CIP Com-
mon specifications in the request path field in a CIP explicit message.
Example: Performing the Reset service (0x05) to the Instance (01 hex) of the Identity object (class: 01
hex)
This section shows how to specify messages to access variables.
The variables to access are given by connecting the segments that are defined in the CIP Common
specifications so that explicit message can be set in the request path field.
The following elements are combined to make the specification.
Specifying the variable to access: The elements are stored in the CIP segments and then joined to
make the message.
Example: Reading the Present Value of One Member of the VarAA.MemB[1.2] Structure Variable
Example for Using the CIP Read Data Service for a Variable Object
8-3-1 CIP Message Structure for Accessing CIP Objects
8-3-2 CIP Message Structure for Accessing Variables
CIP Explicit Message (Request)
[1]
(20 01)
[2]
(24 01)
Service
Code
(0x05)
Request
Service
Data
(num of
elem)
Request
Path Length
(02)
Request Path
Logical Segment
(Class ID)
Logical Segment
(Instance ID)
Specify the performed service
code. Refer to 8-5 CIP Object
Services for information about
the service codes.
Specify the Class ID and
Instance ID to access.
Specify the Request Data
according to the service.
CIP Explicit Message for a Request
“MemB”
(91 04 4D 65 6D 42)
[1]
(28 01)
[2]
(28 02)
ANSI Extended Symbol Segment
Logical Segment
(Member ID)
Service
Code
(4C hex)
Request
Service
Data
(num of
elem)
Request
Path Length
(09)
“VarAA”
(91 05 45 61 72 41 41 00)
Request Path
Refer to 8-6 Read and Write
Services for Variables for infor-
mation about the service codes.
Refer to 8-4-5 Specifying Vari-
able Names in Request Paths
for information about how to
specify variables names.
Refer to 8-7 Variable Data Types
for details about how to specify
data formats.

Omron Sysmac NJ-series Specifications

General

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