KEYENCE IV Series - Manual (Page 20)

2-2 - IV Series User’s Manual (Field Network) -
Overview of EtherNet/IP
What is EtherNet/IP?
EtherNet/IP is an open industrial networking standard developed and maintained by the ODVA (Open
DeviceNet Vendor Association, Inc.). All supported devices can use the communication network regardless
of the vendor.
Ethernet and an industrial protocol have been combined and standardized as EtherNet/IP (Industrial Protocol).
Communication is achieved by combining a protocol called CIP (Common Industrial Protocol) and the TCP/
IP and Ethernet. This allows the network to be shared and used with standard Ethernet.
To start the Ethernet/IP communication, one device needs to open a communication line called a "connection"
for the other device. The device that will open a connection is referred to as the "scanner", and the device
whose connection will be opened is referred to as the "adapter" (IV series is an adapter device).
The EtherNet/IP communication offers the following two types of communications: Cyclic communication
for sending and receiving data periodically (Implicit communication), and message communication for
sending and receiving commands/responses at arbitrary timings.
In the cyclic communication, you can set the RPI (Request Packet Interval: communication cycle) based
on the priority of the data to be sent/received, enabling sending/receiving of data with adjusted overall
communication load. Various data including the control output, status result import, trigger control and
switching to the set program No. can be communicated without a ladder program.
In the message communication, you can send/receive the required commands and responses at the required
timings. The message communication is used for applications requiring no punctuality unlike the cyclic
communication, such as for reading and writing the adapter device settings.
The IV series supports cyclic communication (Implicit communication).
EtherNet/IP
communication
scanner
Normal
(Communication
cycle: 100 ms)
High-speed
(Communication cycle: 5 ms)
Low-speed (Communication cycle: 1000 ms)
EtherNet/IP
communication
adapter
EtherNet/IP
communication
adapter
EtherNet/IP
communication
adapter
Overview of EtherNet/IP
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EtherNet/IP