• Destination address: Specify the destination IP address
b) CPU Unit 2 to EtherNet/IP Unit 2
•
Network type number: "#01" (Output the command via the internal backplane port)
• Destination address: "#12 hex" (Unit address of the EtherNet/IP Unit (Unit number: 2+10
hex =12 hex))
c) EtherNet/IP Unit 2 to EtherNet/IP Unit 3
• Network type number: "#02" (Output the command via the EtherNet/IP port)
• Destination address: Specify the destination IP address
d) EtherNet/IP Unit 3 to CPU Unit 3
• Network type number: "#01" (Output the command via the internal backplane port)
• Destination address: "#00" (Unit address of the CPU Unit)
02\192.168.250.2\01\#12\02\192.168.257.3\01\#00
Route path
(1)
(2)
:
(3) (4)
8-2-5
Request Path (IOI)
A request path indicates an object of a device on the network.
A CIP communications instruction uses the request path to access an object of a device.
Overview of Request Path
In the CIP world, each device is modeled as a collection of objects. An Object abstractly represents
the specific configuration elements of a device.
Object
Instance
Data
Data
Data
Data
Processing
Attributes
Service
External request
(example: read)
Device
Object
Object
Object
In the CIP Common Specification, Object, Class, Instance, Attribute, and Service are defined as fol-
lows: (Source: CIP Common Specification)
Term Definition
Object An abstract representation of a particular component within a device.
Class A set of objects that all represent the same kind of system component.
Instance A specific and real (physical) occurrence of an object.
Attribute A description of an externally visible characteristic or feature of an object.
Service A request from an external object (e.g., to read data).
You use the Class ID Instance ID and Attribute ID to access an object.
Y
ou specify these three IDs to designate an object in a device.
8 CIP Message Communications
8-16
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
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