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About this Manual:
This manual describes the operation of the CS1W-ETN21 and CJ1W-ETN21 Ethernet Units (100Base-
TX) for constructing applications and includes the sections described below.
Please read this manual carefully and be sure you understand the information provided before
attempting to install or operate the Ethernet Unit. Be sure to read the precautions provided in the fol-
lowing section.
Precautions
Section 1 introduces the Ethernet Unit’s communications services, including information on functions
and protocols.
Section 2 describes how to use the Ethernet Unit’s Mail Send Function, including specifications, sta-
tus details, application examples, and troubleshooting information.
Section 3 describes how to use the Ethernet Unit’s Mail Receive Function, including specifications,
status details, I/O memory data formats, file transfer timing, application examples, and troubleshooting
information.
Section 4 describes the functions provided by the FTP server.
Section 5 provides an overview of the automatic clock adjustment function, including details on speci-
fications, required settings, operations from CX-Programmer, and troubleshooting.
Section 6 describes the functionality provided by the Ethernet Unit via the socket services.
Section 7 provides information on communicating on Ethernet Systems and interconnected networks
using FINS commands. The information provided in the section deals only with FINS communications
in reference to Ethernet Units.
Appendices provide information on Ethernet network parameters, the buffer configuration, TCP status
transitions, ASCII characters, maintenance, and inspections.
The related Operation Manual Construction of Networks (W420) provides the following information.
Section Contents
Section 1 Overview of Ethernet Unit features, specifications, and description of the Unit parts and system configura-
tion for constructing Networks.
Section 2 Information on Ethernet Unit’s installation and initial settings required for operation.
Section 3
Information
on setting communications using CX-Programmer.
Section 4 Information on words allocated in the CIO Area and DM Area for Ethernet Units.
Section 5
Information on
how to manage and use IP addresses.
Section 6
Information on
communicating on Ethernet Systems and interconnected networks using FINS
commands.
Section 7
Information on
the FINS commands that can be sent to an Ethernet Unit and the responses that
are returned by the Ethernet Unit.
Section 8 Information on troubleshooting.