CCLINK Bus Cable/CCLINK Shielded Signal Cable
CC-Link's physical layer is RS485, known as the "Japanese RS485."
DA corresponds to +A in RS485, DB corresponds to -B, DG is the common ground, and SLD provides shielding and interference suppression.
In practice, connect DA to the blue wire, DB to the white wire, DG to the yellow wire, and SLD to the shield drain wire. A 110Ω termination resistor is connected between DA and DB.
The termination resistor increases load absorption and reduces signal echo reflection, acting as a passive impedance matching mechanism.
The following suggestions may be helpful:
1. Using impedance-matched, low-attenuation RS485-specific cable is more effective in ensuring communication.
General recommendations include:
Ordinary shielded twisted-pair STP-120Ω cable (for RS485 & CAN) with one pair of 20 AWG, approximately 7.7mm outer diameter. Suitable for indoor use, in pipelines, and general industrial environments. When using, ground one end of the shield.
Standard twisted-pair shielded cable STP-120Ω (for RS485 & CAN) is one pair of 18 AWG, with an outer diameter of approximately 8.2mm. It is suitable for indoor use, in pipelines, and general industrial environments. When used, ground the shield at one end.
Armored twisted-pair shielded cable ASTP-120Ω (for RS485 & CAN) is one pair of 18 AWG, with an outer diameter of approximately 12.3mm. It can be used in locations with severe interference, frequent rodent infestations, and those requiring lightning and explosion protection. It is recommended that both ends of the armor layer be grounded, and the innermost shield be grounded at one end.
CC-Link bus cables are 3-core twisted-pair shielded cables with a characteristic impedance of 110±10Ω. Domestic models include: STP-110Ω (for CANopen & CC-Link) 3C×20AWG. When used, ground the shield at only one end.
2. For transmission distances exceeding 300 meters, a termination resistor (typically 120Ω) should be added.
3. Frequency converters, power cables, transformers, high-power motors, etc. are often accompanied by low-frequency interference, which cannot be eliminated by cables with high-conductivity shielding materials, including imported cables. Only shielding layers made of high-permeability materials (such as steel strips and steel wires) can effectively suppress low-frequency interference.
