What types of IPC network cards are there? What are the functions?
The network card of the control computer is a network component that works at the data link layer. When the all-in-one industrial computer wants to connect and communicate with the external local area network, it can be achieved by inserting a network card into the chassis of the all-in-one industrial computer.
of.
What types of industrial computer network cards are there?
Type 1: wired network card and wireless network card
The wired network card is generally connected to the optical fiber Ethernet switch through the optical fiber cable. The wireless network card is a wireless local area network (WLAN) that uses radio waves as a medium for information transmission. The difference from the wired network lies in the transmission medium. It uses radio technology to replace the network cable. The wireless network card is connected in a wireless way to realize the Internet access function.
Type 2: Fast Ethernet and Gigabit Ethernet
According to the different transmission rates supported by the network card of the industrial control machine, it can be divided into 10Mbps network card, 100Mbps network card (100Mbps network card), 10/100Mbps adaptive network card and 1000Mbps network card (Gigabit network card). relatively broad. Generally, the 1000Mbps industrial control all-in-one network card is mostly used in the industrial control server that should be fast.
Introduction to the function of the network card of the industrial computer
Function 1. Data encapsulation and decapsulation
When sending, add the header and tail to the data handed over to become an Ethernet frame. When receiving, strip the header and tail of the Ethernet frame, and then send it to the upper layer. Simply put, it is to encapsulate the data of the industrial control machine into frames, and send the data to the network through electromagnetic waves; the second is to receive frames from other devices on the network, reassemble the frames into data, and send it to the industrial control machine where it is located. in the machine.
Function 2, link management
When a network card receives an erroneous frame, it discards the frame without notifying the computer it is plugged into. When the network-card receives a correct frame, it uses an interrupt to notify the computer and deliver it to the network layer in the protocol stack. When the computer wants to send an IP data packet, it is handed down from the protocol stack to the network card to be assembled into a frame and sent to the local area network.
Function 3. Encoding and decoding
When installing the network card, the device driver for the management network card must be installed in the computer's operating system. The driver will later tell the network card where in the memory the data blocks sent from the LAN should be stored. The network card must also be able to implement the Ethernet protocol.
