17 Ethernet Option Board
17-6
CP1E CPU Unit Software User’s Manual(W480)
Basic Functions
FINS commands can be received from other PLCs or computers on the same Ethernet network by
executing SEND(090), RECV(098), or CMND (490) instructions in the ladder diagram program. This
enables various control operations such as the reading and writing of I/O memory between PLCs,
mode changes, and file memory operations.
Executing, from the host computer, FINS commands with UDP/IP or TCP/IP headers enables vari-
ous 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 communications applications
such as the CX-Programmer, and to perform remote programming and monitoring.
Upgraded Functions
With the CP1W-CIF41, 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 computer to send FINS commands to PLCs on the Ether-
net 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).
Note The message service does not guarantee that a message will reach the destination node. A message may
be lost during transmission due to factors such as noise. To prevent this from occurring when using message
services, it is common to set up retry processing at the node from which instructions are issued. With the
SEND(090), RECV(098), and CMND(490) instructions, retry processing is executed automatically by speci-
fying the number of retries, so specify a number other than 0.
17-1-5 FINS Communications
Overview of FINS Communication Service
Ethernet
Ethernet Option Board
Ethernet Option Board Ethernet Option Board
IP
UDP or TCP
FINS
CP1E N/NA-type
CPU Unit
To Next Page
Loading...
