CTI 2572-A, Installation And Operation Manual

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CTI 2572-A Installation and Operation Guide
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Offset 9 TCP/UDP port number - If the IP A
DDRESS
S
ELECTION
option bit in Offset 4 is set to 0, this
word specifies the TCP/UDP port number of the remote node. If you are accessing
another 2572, you will typically set this value to 1505 (the recommended value for
the 2572-A PLC server). If you are using UDP and bit 15 of offset 4 is set to 1, then
this address becomes the default port number.
Offset 10-15 Unused - These words are unused and should be set to 0.
5.4. Close Socket Command
The following command block will close a connection to a TCP/IP socket. Once the connection has
been successfully closed, you can re-use the connection number in a subsequent C
REATE
S
OCKET
command block.
Offset Description Hex
Value
Decimal
Value
0 Error Word 0000 0
1 Command Code (Close Connection) 0002 02
2 Connection Number (19221 - 19228)
3- 15 Unused (Set to 0) 0000 0
Offset 0
Error Word - Set to 0 so that any previous error codes are cleared.
Offset 1 Command Code - The Command Code of the Close Connection command is 02.
Offset 2 Connection Number - You can specify any connection number that has been previously
established in a Create Socket command block.
Offset 3-15 Unused - These words are unused by this command and should be set to 0.
NOTE:
This command can be used only for client connections. You cannot use the command to close the
connection to the PLC Network Server.