Profibus DP (Decentralized Periphery) is a high-speed, low-cost communication bus used for device-level control systems and communication with distributed I/O. The Profibus-DP physical layer, which is the Profibus-DP cable, is a high-speed communication cable with a characteristic impedance of 150Ω. It is typically a shielded twisted pair cable with a characteristic impedance of 100Ω. Profibus-DP allows the master node to initiate signals to the slave stations using digital sampling. The Prysm client sends Profibus master station signals to the stations, and the slave stations respond with their response time and short send response time.
The Profibus-DP communication cable consists of solid bare copper wires. It is a 2-core paired cable, with the core wires typically colored red and green. It has dual-layer shielding with aluminum foil and bare metal wire braiding, and it is covered with a PVC outer sheath, which is usually purple in appearance.
Q: What is Profibus-DP bus cable?
A: Profibus-DP bus cable is a communication cable used for device-level control systems and communication with distributed I/O in Profibus-DP networks. It is a high-speed communication cable with a characteristic impedance of 150Ω and is typically a shielded twisted pair cable with a characteristic impedance of 100Ω.
Q: Can ordinary cables be used for Profibus-DP communication?
A: Ordinary cables are not recommended for Profibus-DP communication because they do not meet the specific characteristic impedance requirements of 150Ω.
Q: What is the difference between Profibus and ProfiNet cables?
A: Profibus and Profinet are both industrial fieldbus protocols used for communication. Profibus is a protocol used for industrial fieldbus communication, while Profinet is an Ethernet-based protocol. The cables used for Profibus and Profinet may differ in terms of their physical properties and specifications.
Q: What is MPI cable and how is it different from Profibus cable?
A: MPI cable typically refers to the programming cable used for Siemens PLCs. It is used for programming and communication between Siemens PLCs. On the other hand, Profibus cable is used for communication in Profibus networks, which can include various devices and systems.
Q: How long can a Profibus cable be?
A: The length of a Profibus cable can vary depending on the specific application and transmission speed. For the Profibus-DP physical layer, which is essentially RS485, the characteristic impedance of 150Ω is achieved only when the transmission speed is 12 Mbps, and the maximum communication distance is limited to 90 meters.
Q: How do you connect DP communication cables?
A: DP communication cables typically consist of two wires, one red and one green, with an outer shielding layer. When connecting DP communication cables, it is important to properly connect the shielding layer and ensure it does not come into contact with the inner wires.
Q: How is a DP connector connected to a Profibus cable?
A: DP connectors, such as Siemens DP connectors, are designed to connect Profibus nodes to Profibus bus cables. The connection is made using insulation displacement connection technology, ensuring a quick and easy installation process with minimal assembly time.