CS8C © Stäubli 2009 – D28070504A
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Chapter 5 - Integration
5.8.4. ETHERNET SOCKETS (TCP)
The CS8C controller can be configured to communicate via the Ethernet using sockets (TCP). The CS8C
controller accepts up to 40 sockets simultaneously, in client mode or server mode. The Ethernet sockets are
configured via the "Control panel" application (Control panel > I/O / Socket). UDP sockets are not supported.
The parameters of a server socket are:
• The connection port between 0 and 65535.
• The maximum number of simultaneous clients.
• The time lapse prior to triggering of an error message (maximum time lapse reached in reading or for a
connection). A zero value suppresses the time lapse control.
• The end of string character.
Details of the last two parameters are given in the VAL3 reference manual (SIO type).
The parameters of a client socket are the same, with the extra element of the IP address of the server socket to
be reached. A "Test" menu can be used to test the connection with the server.
A server socket is activated ("opened") in the CS8C each time a VAL3 program uses it, and deactivated ("closed")
when the last customer logs off. When the maximum number of clients has been reached for a server socket, other
clients attempting to log on are accepted but the communication is interrupted immediately by the server.
CAUTION:
The ports between 0 and 1000 are reserved.
CAUTION:
If no VAL3 program has accessed the server sockets in the CS8C, they are not activated, and
all attempts by a customer to connect will remain fruitless. In particular, the "Test" menu used
on a CS8C controller to test a server socket on another CS8C controller produces an error
message if no VAL3 application is running on that controller.
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