What are the advantages and disadvantages of the CAN bus and the PROFIBUS bus 10

The advantage is that there is no master-slave distinction between CAN.

1. It has the advantages of strong real-time performance, long transmission distance, strong anti-electromagnetic interference ability and low cost.

2. Adopt two-wire serial communication mode, strong error detection ability, and can work in high noise interference environment.

3. With priority and arbitration functions, multiple control modules are hung to the CAN-Bus through the CAN controller to form a multi-host local network.

4. The packet can be received or blocked based on its ID.

5. Reliable error handling and error detection mechanism.

6. After the sent message is damaged, it can be automatically retransmitted.

7. The node has the function of automatically exiting the bus in the case of serious errors.

8. The packet does not contain a source or destination address, and only uses markers to indicate the function information and priority information.

CAN bus is also called controller area network, generally speaking, it has the following advantages:

1. The data transmission speed is fast, within a range of 40 meters, the baud rate value of the CAN bus can reach 1Mbps, which is a particularly powerful one among all kinds of buses.

2. The distance of data transmission is long, and the farthest can reach 10 kilometers.

3. Strong anti-external interference ability, due to the use of differential voltage signal for data transmission, the anti-interference ability of CAN bus has made a qualitative leap compared with the general industrial bus, even if there is a problem with a node equipment, this node will take the initiative to cut off the connection between the bus, and will not continue to send wrong data to cause the collapse of the entire bus.

4. A CAN bus can connect 128 node devices at the same time, second only to the RS485 bus, which is especially suitable for industrial equipment with large space requirements.

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It has the advantages of strong real-time, long transmission distance, strong anti-electromagnetic interference ability and low cost; Adopt two-wire serial communication mode, strong error detection ability, can work in high noise interference environment; With priority and arbitration functions, multiple control modules are hung to the CAN-Bus through the CAN controller to form a multi-host local network; The packet can be received or blocked based on its ID. Reliable error handling and error detection mechanisms; If the sent message is corrupted, it can be automatically retransmitted; The node has the function of automatically exiting the bus in the case of severe errors; The packet does not contain a source or destination address and uses a marker to indicate the function and priority.

Higher data transfer speed than conventional cabling methods.

Compared with the traditional wiring method, the wiring harness is saved, the weight of the body is reduced, and the wiring method of the body is optimized.

If one of the control units connected via the CAN bus fails, the other control units can still send their own data without affecting each other.

The CAN data bus is a two-wire system, and if one of them fails, the CAN system will switch to a single-wire operation mode, which improves the stability of the whole field Changsan.

In practice, the two wires of the CAN system are wound together like "twists", which can effectively prevent the interference and outward radiation of electromagnetic waves.

Based on the CAN bus system, a richer body function can be realized.

The application of the CAN bus system greatly simplifies the layout of the body wiring, which can be reflected in the simple and neat layout of the engine compartment. The function of the body has increased, but the wiring harness has been simplified accordingly, and the simplification of the wiring harness has also brought more convenience to maintenance. During use, in the event of a failure, the output function will be automatically turned off, so that other components on the bus are not affected, which improves the stability of the body electronic control system to a certain extent.

This complete network system that connects various functional components together can realize the sharing of information and data across the vehicle, making the car more intelligent and accurate in terms of control. In fact, this technology has begun to enter the ordinary family car, and is no longer exclusive to luxury cars.

CAN bus is a kind of industrial control communication system that is different from the serial port bus, it is produced by Bosch in Germany for the upgrading of automotive electronic products and services, because it is mainly used in automotive control, so its advantages are many inclined to the control of automobiles, such as:

1. The data transmission speed of CAN bus is fast, and the theoretical peak can reach 1Mbps, which has high data communication immediacy.

2. The maximum data transmission distance of CAN bus is 10 kilometers, which can fully meet the communication and control needs of automobiles.

3. A CAN bus can connect 128 nodes at the same time, for a car, one to two CAN buses can be fully competent for the control of the car, which is particularly suitable for cars with every inch of space.

4. The anti-interference ability of CAN bus is very strong, and it will not easily cause problems, which can effectively ensure the safety of drivers.