2-3
Section
Socket Services
15
2-2
FINS Communications
FINS commands can be sent to or received from other PCs or computers on the
same Ethernet network by executing SEND(090), RECV(098), or CMND(490)
instructions in the ladder-diagram program. This enables control operations
such as the reading and writing of I/O memory between PCs, mode changes,
and file memory operations. (When a FINS message is sent on an Ethernet net-
work, a UDP/IP header is automatically added to the message.)
The FINS gateway function allows access not only to PCs on the same Ethernet
network, but also to PCs on other networks such as SYSMAC LINK or Controller
Link.
Ethernet
CS1-series
CPU Unit
Ethernet Unit
User program
SEND(090,
RECV(098), or
CMND(490)
Ethernet Unit
Ethernet Unit
Executing from the host computer FINS commands with UDP/IP headers added
enables various control operations such as the reading and writing of I/O
memory of PCs on the Ethernet network, mode changes, and file memory op-
erations.
Ethernet
CS1-series
CPU Unit
Ethernet Unit
2-3
Socket Services
The socket services allow devices on the Ethernet to send and receive various
data using the UDP or TCP protocol. There are two ways to use socket services,
as explained below. (For details, refer to Section 6 Socket Services.)
The first way to use socket services is to set the required parameters in the pa-
rameter area allocated in the DM Area, and then to request particular UDP or
TCP socket services by turning ON dedicated control switches in memory. The
Ethernet Unit turns OFF the same bit when the requested process has been
completed. Data that is sent or received is automatically handled according to
the I/O memory locations specified in the parameter area.
By Manipulating
Dedicated Control
Switches
