Chapter 4 How to access ET-7000
ET-7000 AIO User Manual, Apr. 2009, V1.04, EMH-011-104----------94
4. How to access ET-7000?
ET-7000 series is designed as remote I/O module that can be accessed via an Ethernet
interface.
4.1. Via an Ethernet Network
Ethernet is an extremely popular networking format that already exists for most
applications, either for use with local networks or for connecting to the Internet. A host PC
or other devices on the LAN or WAN can be connected to access the ET-7000 module or
control the devices attached on the COM1 of the ET-7000 module.
The Host PC is able to access the ET-7000 module using the Modbus/TCP.
Modbus/TCP Protocol
The Modbus/TCP protocol is a variant of the standard Modbus protocol. It was developed
in 1999 to allow access to Ethernet devices by Internet community.
4.2. Using the Modbus protocol
4.2.1. Introduction
MODBUS is a master-slave bus system in which only one device (the master) actively
starts a transaction (query). The passive device (the slave) then sends a response. Most
SCADA Supervisor Control And Data Acuisition and HMI software can easily integrate
serial devices via the Modbus protocol, such as Citect, ICONICS, iFIX, InduSoft, Intouch,
Entivity Studio, Entivity Live, Entivity VLC, Trace Mode, Wizcon, Wonderware, etc.
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