Omron CS1W-ETN21 Socket Services, Upgraded Functions, Manipulating Dedicated Control Bits

Overview of Communications Functions Section 1-5

Executing, from the host computer, FINS commands with UDP/IP or TCP/IP headers enables various control operations, such as the reading and writing of I/O memory between PLCs, mode changes, and file memory operations.

For example, it is possible to connect online via Ethernet from FINS communi- cations applications such as the CX-Programmer, and to perform remote pro- gramming and monitoring. (See note.)

Note Use CX-Programmer version 4.0 to use TCP/IP. For lower versions of CX-Pro- grammer, FinsGateway Version 2003 or higher is required to use TCP/IP.

Ethernet

IP

UDP or TCP

FINS

	CS/CJ-series
	CPU Unit
	Ethernet Unit
	The FINS gateway function enables access to PLCs on not only the same
	Ethernet network but on various other networks, including SYSMAC LINK and
	Controller Link.
Upgraded Functions	With the CS1W-ETN21 and CJ1W-ETN21, the following functions have been
	upgraded.
	• The FINS communications service can be executed not only with UDP/IP
	but also with TCP/IP, and it is even possible to use FINS communications
	with both UDP/IP and TCP/IP together on the same network. Using TCP/
	IP makes FINS communications highly reliable.
	• Even if the IP address and UDP port number of the host computer (a
	DHCP client computer) are changed, it is still possible for the host com-
	puter to send FINS commands to PLCs on the Ethernet network and to
	receive responses. When UDP is used, either the automatic generation
	(dynamic) method or the IP address table method must be selected for IP
	address conversion. When TCP is used, changes in IP address and TCP
	port numbers are handled automatically.
	• Multiple FINS applications (CX-Programmer and user-created application
	programs) at the same computer can be connected online to a PLC via
	Ethernet (using either TCP/IP or UDP/IP).

1-5-2 Socket Services

Manipulating Dedicated Control Bits

The socket services allow devices on the Ethernet to send and receive vari- ous data using either the UDP or TCP protocol.

One way to use socket services is to set the required parameters in the parameter area allocated in the DM Area, and then to request particular UDP or TCP socket services by turning ON dedicated control bits in memory. When the Ethernet Unit has completed the requested process, the same bit is turned OFF to provide notification. Data that is sent or received is automati- cally handled according to the I/O memory locations specified in the parame- ter area.

There is no need to execute the CMND(490) instruction or to monitor the com- pletion timing and actual processing of the instruction, so this helps to simplify ladder programming.

18