Overview
What are Communication Cables?
Industrial communication cables are specialized data transmission lines designed to connect PLCs, HMIs, Variable Frequency Drives (VFDs), and remote I/O modules. Unlike standard networking cables, industrial variants are engineered to maintain signal integrity in environments saturated with electromagnetic interference (EMI) and mechanical stress. They facilitate various fieldbus and industrial Ethernet protocols, including EtherCAT, CANopen, Modbus, and PROFINET, ensuring real-time synchronization between control systems and motion hardware.
Main Manufacturers
Palm Parts Solution stocks high-performance communication cables from leading automation brands, ensuring seamless integration with your existing hardware:
- Lenze: Specialized in system bus cables and diagnostic cables for the i500, i700, and 8400 series drives.
- Delta Electronics: Providing a wide range of DVP series PLC cables, AH series high-speed backplane cables, and ASD-A2/B2/A3 serially-interfaced cables for servo systems.
Typical Applications
Communication cables are the backbone of any automated architecture. They are found in:
- Motion Control: Connecting Delta ASDA servo drives to motion controllers via EtherCAT or CANopen for high-speed positioning.
- Drive Parameterization: Using Lenze USB-to-CAN or RS-485 adapters to configure inverters via PC-based software (EASY Starter).
- HMI-to-PLC Links: Establishing RS-232, RS-422, or Ethernet links between Delta DOP-100 series HMIs and DVP-series PLCs.
- Robotics: Deploying high-flex cables in robotic arms where continuous twisting and bending are required.
Selection Guide
When sourcing replacement or new-build communication cables, consider the following technical criteria:
- Protocol Compatibility: Ensure the cable impedance and twist-pair geometry match the protocol (e.g., 120-ohm for CANopen).
- Connector Type: Selection ranges from standard RJ45 and M12 (D-coded or X-coded) to proprietary high-density D-sub connectors found on Delta I/O modules.
- Environmental Rating: Choose PVC jackets for general use or PUR (Polyurethane) for environments with heavy oil exposure and abrasion.
- Shielding: Opt for SF/UTP (Screened and Foiled) to prevent data corruption near high-voltage motor leads.
- Length and Signal Attenuation: Follow manufacturer maximum length guidelines (e.g., RS-485 up to 1200m at lower speeds, or EtherCAT limited to 100m between nodes) to prevent packet loss.
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Frequently asked questions
What is the difference between industrial and standard communication cables?
The primary difference lies in shielding and durability. Industrial communication cables (like those from Lenze and Delta) feature double-shielding (braid and foil) to protect signals from Electromagnetic Interference (EMI) generated by high-voltage motors and VFDs. They also use PUR or PVC jackets resistant to oil, chemicals, and extreme temperatures, whereas standard office cables would degrade and fail in such environments.
How do I choose the right communication cable for my PLC or Drive?
You must match the connector type (e.g., RJ45, M12, DB9), the specific protocol (EtherCAT, CANopen, RS-485), and the cable length. For mobile applications like cable carriers, ensure the cable is rated for 'high-flex' or 'continuous motion' to prevent internal wire breakage. Delta and Lenze provide specific part numbers for pre-assembled cables that guarantee impedance matching for their drives.
Can I use a third-party cable for my Delta or Lenze system?
Yes, as long as the pinout and electrical specifications match. For example, a standard shielded EtherCAT cable can often replace a brand-specific one if the environment allows. However, for proprietary interfaces like certain Lenze system bus (CAN) connectors or Delta high-density I/O cables, using the manufacturer-specified cable is recommended to avoid communication timeouts or physical connection issues.
What are the voltage and power ratings for these cables?
Industrial communication cables are generally not designed to carry power, with the exception of Power over Ethernet (PoE) or specific hybrid cables (One-Cable Technology). Standard signal cables usually operate at 24V DC logic levels or low-voltage differential signaling. Always check the datasheet to ensure the insulation rating is sufficient if the cable is routed in a tray alongside 480V power lines.
Why do communication cables fail in industrial environments?
Common causes include a bend radius that is too tight, causing 'corkscrewing' of the internal pairs, shielding failure leading to intermittent EMI noise, or oxidation of pins in high-humidity environments. If a network is experiencing CRC errors or dropped packets, the physical cable is often the first point of failure to inspect.