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CTI 2572 Installation and Operation Guide
21
TCP S
ERVER DISABLE - Setting this bit to 1 will disable TCP connections to the PLC
server. The 2572 will reject attempts by a remote client to connect via TCP to the
server. However, you can still initiate a client TCP connection from this PLC. A
setting of 0 (TCP Enabled) is the normal mode.
UDP S
ERVER DISABLE - Setting this bit to 1 will disable UDP (connectionless)
protocol for the server. The 2572 will reject all UDP datagrams sent to the server.
However, you can still initiate a client UDP connection from this PLC. A setting of
0 (UDP Enabled) is the normal mode.
E
CHO SERVER DISABLE - Setting this bit to 1 will disable the TCP and UDP echo
servers (Port 7). TCP connection attempts and UDP datagrams directed to port 7
will be rejected by the 2572. A setting of 0 (Echo Server Enabled) is the normal
mode.
You might choose to disable TCP for the server if you need additional process slots
for creating client network connections. Disabling TCP frees two process slots
which allows you to create two additional network connections. When you disable
TCP, the server will still process UDP messages.
You might choose to disable UPD if you want to support only connection-oriented
conversations. This option can provide a means to limit the transaction load on the
PLC server, since you can also control the number of TCP connections allowed (see
offset 11). You may also choose to disable UDP if you need an additional process
slot for a TCP/IP socket. When you disable UDP, the 2572 is able to support one
additional TCP server connection or PLC Client network connection.
You might choose to disable both TCP and UDP if you are using the 2572 in client
mode only. Note that you must have at least one enabled 2572 server or computer
host server somewhere on the network to respond to your messages. This option
frees up three additional process slots.
The Echo Servers (TCP and UDP) provide a handy diagnostic tool for checking out
TCP/IP communications at a level higher than Ping. You may wish to disable the
Echo Servers if you need to obtain more process slots for the 2572 PLC server.
Disabling the Echo servers frees up two process slots.
Unless you have a specific reason to do otherwise, use the defaults.
NOTE:
You cannot disable TCP, UDP, and the ECHO servers simultaneously. At least one must be enabled
in order to start the network server.
Offset 5 TCP Keep Alive Interval - This value specifies the amount of elapsed time (in
seconds) without any messages from the client application before the 2572 will
automatically close a server TCP socket. If the value is set to 0, then the 2572 will
use the default value of 60 seconds. To disable Keep Alive, set the value to 65,000
or greater.