TRICONEX 3009X 连接器提供支持互联网的连接介质

Another important aspect of all 3009X is their communication capability. The earliest form of digital communication was a serial point-to-point interface, usually an RS-232 connection (referred to by many users as a “serial port”). This point-to-point connection is still useful for programming, but it is more likely to be seen as a USB connector on modern PLCs.

In order to interface with endless external devices, a 3009X network adapter is absolutely necessary. Some major network protocols dominate the industrial market. The most common is Ethernet. The 8-pin RJ or circular M12 connector provides the connection media supporting the Internet. Many older communication protocols, especially Modbus and Controller Area Network (CAN) systems, run on Ethernet interfaces, providing a simple way to use old devices with brand new controllers.

Other common network interfaces for 3009X include Profinet, ControlNet, EtherCAT, RS-485, etc. Most PLCs can accept downloaded programs through these interfaces, as long as the programming PC has an adapter that interfaces with the protocol. In the figure below, you can see a CPU in the Automation Direct “Productivity” series, with many ports in front: RS-485 (green connector at the top), USB, RS-232, Ethernet, and even an SD card slot for recording data and programs.