Comparison of Profinet and Profibus Bus Performance

 PROFINET and PROFIBUS are two types of fieldbuses introduced by the PNO organization. The two are not comparable by themselves, PROFINET is based on Industrial Ethernet, and PROFIBUS is based on the RS485 serial bus. The two protocols are completely different due to different media, and have no connection. The similarities between the two are very good in real-time, because they all use a simplified stack structure. Any development based on standard Ethernet can be directly applied to a PROFINET network. There are far more developers of Ethernet-based solutions in the world than PROFIBUS developers, so there are more resources available to innovate technologies.

Comparison of PROFINET and PROFIBUS performance

For PROFIBUS, the maximum data transmission bandwidth is 12Mbps.

→ For PROFINET, the bandwidth for data transmission is 100Mbps.

For PROFIBUS, the data transmission is half duplex.

→ For PROFINET, the data is transmitted in full duplex mode.

For PROFIBUS, the consistency data is up to 32 bytes.

→ For PROFINET, the consistency data is up to 254 bytes.

For PROFIBUS, the maximum user data is 244 bytes.

→ For PROFINET, the maximum user data is 1400 bytes.

For PROFIBUS, the maximum bus length of 12 Mbps is 100 m.

→ For PROFINET, the bus length between devices is 100m.

For PROFIBUS, the leading axis must be operated in the DP master.

→ For PROFINET, the leading axis can be run in any SIMOTION.

For PROFIBUS, configuration and diagnostics require special interface templates, such as the CP5512.

→ For PROFINET, a standard Ethernet network card can be used.

For PROFIBUS, if a PG is connected, it may cause communication problems.

→ For PROFINET RT, a PG access may have minimal reaction, while for PROFINET IRT, access will not cause any problems.

For PROFIBUS, special tools are required for network diagnostics.

→ For PROFINET, use IT-related tools.

For PROFIBUS, there is usually only one master on the bus. Multi-master systems can cause long cycle times for DP.

→ For PROFINET, any number of controllers can operate in the network. Multiple controllers do not affect the IO response time.

For PROFIBUS, the main fault on the bus stems from mismatched or poorly grounded bus termination resistors.

→ The bus terminating resistor is not required for PROFINET.

For PROFIBUS, copper and fiber optics are used as communication media.

→ For PROFINET, wireless (WLAN) can be used for additional media.

For PROFIBUS, an interface can only be master or slave. à For PROFINET, all data types can be used in parallel.

→ For PROFINET, an interface can act as both a controller and an IO device.

For PROFIBUS, the network location of the device cannot be determined.

→ For PROFINET, the topology information can be used to determine the network location of the device.