Specifying Request Path; Examples Of Cip Object Specifications; Examples Of Variable Specifications; Logical Segment - Omron NY532-5400 User Manual

8 CIP Message Communications
8-4

Specifying Request Path

The CIP object, variable name, structure member name, and array index are specified for the request
path. In CIP, the EPATH data type is used for the request path. With this method, the request path is
divided into segments and a value is assigned to each segment. The request path notation shows the
path to the final destination when the data segments are joined together. Each segment includes the
segment type information and the segment data.
Segment 1
The first byte gives the interpretation method for the segment. It consists of two parts; a 3-bit segment
type and a 5-bit segment format.
Segment Type
7 6 5
The segment type specifications are defined as follows in the CIP specifications.
Segment Type
7 6 5
0 0 0
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
The specifications of segment format are different for each segment type. Use the segment format to
request a service from a particular object of a particular device. Logical segments and data segments,
which are needed to specify variables in CIP message communications, are described below.
8-4-1

Examples of CIP Object Specifications

Logical Segments are joined to form the request path that specifies the object to access.

Logical Segment

(Class ID)
Specify the Class ID.
8-4-2

Examples of Variable Specifications

Segments are joined to form the request path that specifies the variable to access.
Data Segment
(ANSI Extended Symbol Segment)
Specify the variable name and
the member name.
8-34
Segment 2 Segment 3
Segment Format
4 3 2 1 0
Meaning
Port Segment
Logical Segment
Network Segment
Symbolic Segment
Data Segment
Data Type
Data Type
Reserved
Logical Segment
(Instance ID)
Specify the Instance ID.
Logical Segment
(Member ID)
Specify the array index.
NY-series Industrial Panel PC / Industrial Box PC Built-in EtherNet/IP Port User's Manual (W563)
Segment 4
Logical Segment
(Attribute ID)
Specify the Attribute ID.