Outline; Ethernet/Ip Communications Protocol - Omron V780-HMD68-EIP-KR User Manual

7 Ethernet/IP Communications
7-1

Outline

7-1-1

EtherNet/IP Communications Protocol

Data is exchanged cyclically between Ethernet devices on the EtherNet/IP network using tag data links
as shown below.
An example of connection with a CS/CJ-series CPU Unit is shown below.
An example of connection with a NJ/NX-series CPU Unit is shown below.
Data Exchange Method
To exchange data, a connection is opened between two EtherNet/IP devices.
One of the nodes requests the connection to open a connection with a remote node. The node that
requests the connection is called the originator, and the node that receives the request is called the tar-
get. The host device (PLC) and Reader/Writer function as the originator and target.
Data Exchange Memory Locations
The memory locations that are used to exchange data across a connection are specified as tags.
You can specify memory addresses or variables in the host device (PLC) for tags.
A group of tags consists of an output tag set and an input tag set.
7 - 2
CS/CJ-series CPU Unit
Output
Connection
Tag set name: ABC
Output tags
• D100
Target
Input
Connection
Tag set name: XYZ
Input tags
• D200
Originator
EtherNet/IP
NJ/NX-series CPU Unit
Input
Tag set name: ABC
Var_In_a
I/O refreshed. I/O refreshed.
• Var_In_a
• Var_In_b
Var_In_b
• Var_In_c
Var_In_c
Originator
Output
Var_Out_d
Tag set name: XYZ
Var_Out_e
I/O refreshed. I/O refreshed.
• Var_Out_d
Var_Out_f
• Var_Out_e
• Var_Out_f
Target
UHF RFID System V780-series Reader/Writer User's Manual (EtherNet/IP
Reader/Writer
Input
Tag set name: Output_10□
Input tags
• Output_10□
Originator
Output
Tag set name: Input_11□
Output tags
□
• Input_11
Target
Reader/Writer
Outputs
Connection
Tag set name: OUT1
• Var-Out1
Input tags Output tags
• Var-Out2
• Var-Out3
Target
Input
Connection
Tag set name: IN1
• DM00200
Output tags Input tags
• WR300
• DM20100
Originator
EtherNet/IP EtherNet/IP
TM
) (Z402)