PLC s dedicated communication protocol Can it be explained in layman s terms?

The "dedicated" communication protocol of the PLC is for a certain brand or a certain series of PLCs of a certain brand.

Take Siemens' PLC as an example.

MPI is dedicated to it, because this protocol can only be used by Siemens PLCs, in other words, the MPI communication protocol can only be used on Siemens PLCs.

Profibus is not dedicated, because it is not a special confidentiality agreement of Siemens, as long as the device that supports the Profibus protocol, you can complete handshake communication, for example, I use S7-400 to communicate with Schneider's inverter through the Profibus protocol.

Communication protocols are used to implement standards between computers and network connections, and without a unified communication protocol on the network, the information transfer between computers cannot be recognized. A communication protocol is a pre-agreed rule between the parties to a communication, which can be simply understood as the common language used by computers to talk to each other. The communication protocol that must be used when two computers communicate.

Definition A communication protocol refers to the rules and conventions that must be followed by two entities to complete a communication or service. The protocol defines the format of the data unit, the information and meaning that the information unit should contain, the connection method, and the timing of the message sending and receiving, so as to ensure that the data in the network is smoothly transmitted to the specified place.

In computer communication, the communication protocol is used to implement the standard between the computer and the network connection, and the information transmission between the computers cannot be recognized without a unified communication protocol on the network. A communication protocol is a communication rule agreed upon in advance by all parties to a communication, which can be simply understood as the common language used by computers to talk to each other. The communication protocol that must be used when two computers communicate.

In layman's terms, a communication protocol is a communication agreement that everyone can understand

Summary. Hello dear! There are several ways to obtain the PLC network communication protocol:

1.Obtain directly from the manufacturer of the equipment: In general, the manufacturer of each equipment will give the PLC network communication protocol of its own equipment, such as modbus, PROFINET, etc.; >2.

Obtained from network resources: Some network resources will open examples of different PLC network communication protocols**, you can get the corresponding network protocols from these examples, and the example** can also be used directly; >3.Reverse query:

If you can't get the network protocol of a specific PLC device, you can try to reverse query by analyzing the corresponding parameters of the PLC device, of course, this method will be very difficult. In addition, it should also be noted that when establishing PLC network communication, in addition to being familiar with the basic content of the network protocol, special attention should be paid to the security strategy of PLC equipment, so as to be safe and reliable, so as to avoid security losses caused by hackers.

Hello dear! There are several ways to obtain PLC network communication protocol: >1

Obtain directly from the manufacturer of the equipment: In general, the manufacturer of each equipment will give the PLC network communication protocol of its own equipment, such as modbus, PROFINET, etc.; >2.Get from a web resource:

Some network resources will open examples of different PLC network communication protocols**, you can get the corresponding network protocols from these examples, and the examples** can also be used directly; >3.Reverse query: If you can't get the network protocol of a specific PLC device, you can try to perform reverse query by analyzing the corresponding parameters of the PLC design, of course, this method will be very difficult.

In addition, it should also be noted that when establishing PLC network communication, in addition to being familiar with the basic content of the network protocol, special attention should be paid to the security strategy of PLC equipment, so as to be safe and reliable, so as to avoid security losses caused by hackers.

The method of obtaining the PLC network communication protocol is usually as follows: consult the equipment documentation: PLC equipment usually has corresponding documents and manuals, which will contain the network communication protocol of the equipment and the setting method of related parameters.

You can find the corresponding documents by querying the device model and version information. Consult the manufacturer's technical support: If you don't find the required information in the document, you can consult the technical support of the equipment manufacturer.

They can provide you with detailed information about your device's communication protocol and parameter settings. Use network sniffing software: Use network sniffing software to capture communication packets between PLC equipment and other devices, so as to analyze the communication protocol and communication parameters used by the device.

However, using this method requires certain knowledge of network technology and software, and you need to pay attention to the security of the device. Use simulator software: Some PLC equipment provides simulator software, which can simulate the operating environment and communication process of the equipment.

The communication protocol and parameter settings of the device can be tested and analyzed by means of simulator software. No matter which method is used to obtain the PLC network communication protocol, it is necessary to have certain technical knowledge and skills to ensure the security and correctness of the data. At the same time, it is necessary to pay attention to the safety of the equipment to avoid damage to the equipment or affect its normal operation.