Omron CS1W-ETN21 Features, Compatibility and Speed, Various Protocols Available on Ethernet

Features	Section 1-2
Automatically Adjusting the PLC's Internal Clock at Regular Intervals
Operation	Use the automatic clock adjustment function.
	With the automatic clock adjustment function, the SNTP server's clock is
	taken as the standard for automatically adjusting the built-in clock of the PLC
	connected to the Ethernet Unit. The adjustment can be regularly executed at
	a specified time (once a day) and it can be executed each time by the ladder
	program.
	To use the automatic clock adjustment function, there must be a separate
	SNTP server on the network. Aside from the IP address, the host name used
	for DNS service can be specified for the SNTP server.
Reference	SECTION 5 Automatic Clock Adjustment Function in the Operation Manual
	Construction of Applications

1-2 Features

Compatibility and Speed

The transmission medium has been upgraded to 100Base-TX, while compati- bility with the functions and application interfaces of the existing Ethernet Unit models (CS1W-ETN01, CS1W-ETN11, and CJ1W-ETN11) has been main- tained. Moreover, processing speed has been improved so that the system response performance for the same FINS message applications is now up to four times faster.

Various Protocols Available on Ethernet

A variety of protocols makes available a wide range of applications for use on an Ethernet network. The protocols that can be selected include sending and receiving data by TCP/IP or UDP/IP (socket services), sending and receiving commands by OMRON's standard protocol FINS, transferring files by FTP, sending and receiving e-mail by SMTP/POP3, and automatically adjusting the PLC's internal clock by SNTP.

A communications service can be selected according to need, allowing the

PLC to be flexibly integrated with the Ethernet information network.

Communications by UDP/IP and TCP/IP (Socket Services Function)

The standard Ethernet protocols, UDP/IP and TCP/IP, are supported, making it possible to communicate with a wide range of devices, workstations, com- puters, and Ethernet Units from other manufacturers.

Up to eight ports can be used for various protocols, enabling the use of vari- ous applications.

Simplified Socket Services

Without using the CMND(490) instruction, the socket services function for TCP or UDP can be simplified by presetting parameters and using dedicated bits. In addition, the size of received data accumulated in the reception buffer is now stored, and a Data Received Flag has been added. These new fea- tures eliminate the need for ladder programs to monitor the timing for comple- tion of instructions and socket service processing, and thus reduce the amount of labor required for program development.

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