TCP\IP: Socket Init

This function is located on the Com>TCP/IP menu.

Vision controllers currently offer 4 sockets. Sockets may be configured to TCP, UDP, UDP RAW, or HTTP.

The default configuration means that, for most applications, you do not need to include a Socket Init FB in the ladder application. However, if, for example, your application requires 4 sockets for TCP, change the default configuration of Socket 0 from UDP to TCP via the Socket Init FBs.

The default socket configuration includes:

Socket	Protocol	Port Number	Function
0	UDP	20,000	Enables data to be both transmitted and received within a PLC network, via MODBUS. Note ♦ If you are using the default settings for Socket 0, note that data is sent to IP: 255.255.255.255. port: 20,000 plus the last byte of the IP address originally assigned to the device. This is why Port numbers 20,000-20,255 are reserved for Socket 0.
1	TCP	20,256	Enables PC to PLC communication via UnCmDrv1.dll, including VisiLogic, Remote Access, and other Unitronics communication applications.
2	TCP	502	Set to 'listen' as server (slave), enables MODBUS applications such as OPC servers and SCADA systems which use MODBUS TCP over IP.
3	TCP	20,257	Set to 'listen' as server (slave), enables non-Unitronics PLCs to access Unitronics PLCs, via MODBUS.

Note ♦

UDP Unicast (device to device)
- Socket 0 is set to broadcast by default. To set it to work via UDP (device to device)by turning SB 159 OFF.

- If you set Sockets1-3 to UDP, they will be in Unicast mode.

♦

Enabling VisiLogic to communicate with a PLC over UDP

-- Socket 0 can be set to work via UDP Unicast by turning SB 159 OFF, and then running Socket Init to initialize Socket 0 to UDP.

♦

Select TCP Client (master) to configure a socket to enable the PLC to send e-mail.

♦

Select HTTP to configure a socket to enable the PLC to function as a Web Server.