IDEC KW2D Series, Руководство пользователя

Страница: 50 / 129

2 EtherNet/IP Communication (Adapter)
4-8
KW2D Series Smart RFID Reader User’s Manual
2.2 EtherNet/IP Adapters
The KW2D Series Smart RFID Reader provides the following functions as an adapter for EtherNet/IP devices
• I/O message communication (target) function (Class 1 communication)
• Class3/UCMM communication
●
I/O Message Communication Overview
■ What is I/O Message Communication?
I/O message communication is a function that allows EtherNet/IP devices to cyclically read and write data with each
other. The target unit for reading/writing data is called a CIP connection point. CIP tag names and instance IDs are
assigned to CIP connection points. In I/O message communication, an EtherNet/IP device reads/writes data by
specifying the CIP tag name or instance ID of a CIP connection point.
■ What is a CIP connection?
A CIP connection is a virtual communication line between EtherNet/IP devices. In I/O message communication, one
device sends a request to open a CIP connection to the CIP connection point of the other device, and when successful,
data is read and written.The side that sends the request to open the CIP connection is called the originator. The side
that receives the request is called the target. The KW2D Series Smart reader can be the target. The KW2D Series
Smart reader can open 3 CIP connections at the same time.
●
Types of CIP Connections
There are the following three types of CIP connections. Exclusive Owner can transmit and receive data. Input Only and
Listen Only can only receive data.
■ Exclusive Owner
This CIP connection cyclically transmits data from the target to the originator (1) and cyclically transmits data from the
originator to the target (2). The CIP connection point is specified as a CIP tag name or an instance ID. Communication
is performed at the cycle (RPI) specified when the CIP connection is opened *1 . Data can be transmitted and received
when the originator opens *2 the connection.
*1 Class 1 communication (cyclic communication) is performed.
*2 Request a ForwardOpen service from the originator for Class 3 communication and open a connection.
(When starting communication)
Request to open CIP connection
Response
Originator
(Host device)
(During communication)
Target
(KW2D Series Smart RFID Reader)
CIP Connection
Regular cycle
I/O message communication (1)
Regular cycle
Instance ID: 200
CIP connection points
Instance ID: 100
I/O message communication (2)