Omron CJ1W-EIP21 User Manual

The FINS/TCP method is a FINS communications method that uses the TCP/
IP protocol. TCP/IP is a connection-type communications protocol. Before a
message is sent from one node to another, it is necessary to establish a vir-
tual circuit, i.e., a connection. Once a connection has been established, com-
munications are quite reliable. The arrival of data that is sent via the
connection is confirmed by an acknowledgement (ACK) response, and retries
are executed automatically as required. 

When FINS/TCP is used, it must be determined which node is the server and
which nodes are the clients.

For communications between a personal computer and a PLC, the computer
should normally be set as the client and the PLC as the server. For communi-
cations between two PLCs, either one can be set as the client and the other
as the server.

Compared to the FINS/UDP method, the FINS/TCP method has the following
characteristics.

• Data transmission is more reliable, due to factors such as retry process-

ing at the TCP/IP layer. The FINS/TCP method is thus better suited to
dealing with communications errors in an IP network that spans several
layers.

• Remote clients can be restricted by means of settings at the server (i.e.,

the server can be protected from access by non-specified IP addresses).

• Broadcasting cannot be used.

• TCP/IP has various retry procedures, and this tends to lower its perfor-

mance in comparison with UDP/IP.

• There is a limit to the number of connections that can be made (i.e., 16

connections maximum), and any given node can communicate only with
up to 16 other nodes at a time.

Node

(Client)

Data transmission 1

Request to establish a connection

Node

(Server)

Notification of establishing 
connection

Acknowledgement

Acknowledgement

An acknowledgement is received whenever a 
connection is established or data is sent, so 
transmissions are more reliable but somewhat slower.

Connection  
established