Profinet is an Ethernet-based industrial communication protocol, widely used in automation control systems, Profinet cable special requirements are mainly focused on physical characteristics, electrical performance, environmental adaptability and installation requirements. This article will focus on Profinet cable for detailed analysis.
I. Physical Characteristics
1, cable type
Shielded Twisted Pair (STP/FTP): Shielded Twisted Pair is recommended to reduce electromagnetic interference (EMI) and crosstalk. Shielded twisted pair can effectively prevent external electromagnetic interference and improve the stability and reliability of signal transmission.
Unshielded Twisted Pair (UTP): Unshielded Twisted Pair can be used in environments with less electromagnetic interference, but is not recommended for use in industrial environments.
2, cable structure
Four pairs of twisted-pair cable: Profinet cable usually contains four pairs of twisted-pair cable, each pair of wires composed of two wires for the transmission of data and power supply (if necessary).
Wire Diameter: Wire diameters are typically 22 AWG, 24 AWG, or 26 AWG, depending on the transmission distance and signal strength requirements. 24 AWG is suitable for longer transmission distances, and 26 AWG is suitable for shorter distances.
3、Connector
RJ45 connector: Profinet cables use standard RJ45 connectors to ensure compatibility with Profinet devices.
Locking Mechanism: RJ45 connectors with locking mechanism are recommended for industrial environments to prevent loose connections and ensure the reliability of the connection.
Second, environmental adaptability
1、Temperature range
Wide temperature design: Profinet cable should be able to work properly in a wide temperature range, usually required to support -40 ° C to 70 ° C temperature range.
2、Protection level
High protection level: Choose cables with high protection level (e.g. IP67) to prevent the entry of dust and water vapour for harsh industrial environments.
3、Vibration and shock resistance
Mechanical strength: Profinet cables should have good vibration and shock resistance, suitable for vibration and shock environment.
4, chemical resistance
Oil, acid and alkali resistance: Select cables with chemical resistance such as oil, acid and alkali resistance to adapt to different industrial environments.
III. Installation Requirements
1、Wiring path
Avoid strong electrical interference: in the wiring should try to avoid parallel laying with high-voltage power lines, motors and other strong electrical equipment to reduce electromagnetic interference.
Reasonable layout: Reasonable planning of the wiring path, to avoid excessive bending or pressure on the cable, to ensure the physical integrity of the cable.
2、Fixing method
Fixed bracket: Use the appropriate fixed bracket and fixture to ensure that the cable is firmly fixed to prevent vibration or movement caused by loose connections.
Wire channel and pipe: In complex environments, it is recommended to use wire channel or pipe for cable protection to prevent mechanical damage and environmental impact.
IV. Certification and standards
1、Compliance standards
IEC 61158: Profinet cables shall comply with the standards of the International Electrotechnical Commission (IEC), such as IEC 61158.
ISO/OSI model: Profinet cables should comply with the physical layer and data link layer standards of the ISO/OSI model.
V. Selection method
1、Assessment of application requirements
Transmission distance: According to the actual application of the transmission distance to select the appropriate type of cable. Short distance transmission can choose 24 AWG cable, long distance transmission is recommended to choose 22 AWG cable.
Environmental conditions: Select the appropriate cable according to the temperature, humidity, vibration and other factors of the installation environment. For example, select high temperature resistant cable for high temperature environment and waterproof cable for humid environment.
2, choose the right type of cable
Shielded twisted-pair cable: Shielded twisted-pair cable is recommended for use in most industrial environments to reduce electromagnetic interference and crosstalk.
Unshielded twisted-pair cable: only in the environment of electromagnetic interference is small to use unshielded twisted-pair cable.
3, consider the environmental adaptability
Temperature range, level of protection, vibration and shock resistance, chemical resistance: choose cables that can work stably in the actual application environment.
Post time: Nov-14-2024