To use the twisted pair to download the program to the panel should use cross-line or direct connection - Database & Sql Blog Articles

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Siemens' panel supports a wide range of download methods, and the integrated Ethernet port panel supports Ethernet download mode, which requires twisted pair. Should you use a straight twisted pair or a crossover twisted pair?
First, the following basic knowledge is described: the interface of the Ethernet device is divided into two types. One is MDI (MediumDependent), which transmits data on the twisted pair 1 and 2 pins, and the 3 and 4 pins receive data. The other is MDI-X (MediumDependentInterfacecross-over), the transmit and receive pairs of the interface are internally reversed, which corresponds to the twisted pair 3 and 4 pins to transmit data, and the 1 and 2 pins receive data. Therefore the connection principle is: MDI and MDI, MDI-X and MDI-X are connected by cross lines. MDI and MDI-X are connected by a straight cable.
The host network card is generally an MDI interface, the router is also an MDI interface, and the common port of the switch and the hub is the MDI-X interface, so the following famous principle is available:
Straight line is used to connect:
1. Host and switch/hub
2. Router and switch/hub crossover are used to connect:
1. Switches and switches
2. Host and host
3. Hubs and hubs
4. Hubs and switches
5. Host and router computers, panels, and plc are all part of the host mentioned above, so the computer should use a crossover twisted pair when downloading the program to the panel via Ethernet.
With the development of computer network technology, cross-connect direct adaptive technology has emerged. More and more computer network cards adopt this technology. The network card using this technology can download programs to the panel whether through direct connection or crossover. Later, cross-connected adaptive technology became an international standard for Gigabit NICs. That is to say, all Gigabit NICs support cross-connected adaptive function. When using the direct connection or crossover line for the panel download program, .
The current computer network card basically uses Gigabit network card. How to judge whether the network card on the computer is a Gigabit network card? You can check the name of the network card in the device manager. If there is a Gigabit (Gigabit) identifier, it is a Gigabit network card:

So is it only that Gigabit NICs support cross-connect direct adaptation? This is not the case. For 100 Mbps NICs, cross-connected adaptive is not an international standard, but as long as the manufacturer is willing to do it, it can also be crossed. With the adaptive function, you need to check the device manual or pass the test to check if it has this function.
Taking Siemens equipment as an example, Siemens' Ethernet equipment, including panels, integrated PN 300/400 PLC, CP343-1/443-1 and S71200 PLC, which are listed soon, are all 100M network cards. among them,
1. The panel has not been equipped with cross-connected adaptive function so far;
2. The old version of the integrated PN 300/400 PLC, CP343-1/443-1 does not have the cross-connected adaptive function;
3. The latest version of the integrated PN 300/400PLC, CP343-1/443-1 with cross-connected adaptive function; (check the product specification manual for specific information)
4. S71200PLC has cross-connect direct adaptive function.