Description:The Allen-Bradley 1786-RG6 is a 75-ohm, quad-shield coaxial cable specifically engineered for Rockwell Automation’s ControlNet networks. As the standard media for this deterministic, high-speed I/O and peer-to-peer network, this cable ensures signal integrity in electrically noisy industrial environments. Its robust construction—featuring a solid bare copper center conductor, foam polyethylene dielectric, and four layers of shielding (aluminum foil + braid)—provides superior immunity to EMI/RFI interference, making it the backbone for reliable communication between PLCs, drives, and remote I/O racks.Application Scenarios:In an automotive paint shop in Taiyuan, precise synchronization between robotic controllers and remote I/O blocks is critical. The 1786-RG6 cable is deployed as the trunk line running along the conveyor, connecting multiple ControlNet taps (1786-TPS). Its quad-shield construction effectively blocks interference from the high-power motor drives and fluorescent lighting, preventing data corruption that could cause mis-timed spray operations. The cable’s UV-resistant PVC jacket withstands the chemical-laden atmosphere, ensuring years of maintenance-free operation.
Parameter:
| Parameter | Value / Specification |
|---|---|
| Product Model | 1786-RG6 |
| Manufacturer | Rockwell Automation (Allen-Bradley) |
| Cable Type | RG-6 Quad Shield Coaxial (Belden 9907 Equivalent) |
| Impedance | 75 ohms (Standard for ControlNet) |
| Center Conductor | 18 AWG Solid Bare Copper |
| Dielectric | Foam Polyethylene |
| Shielding | Quad Shield (Foil + Braid, Foil + Braid) |
| Jacket | PVC, UV-Resistant (Typically Blue or Black) |
| Velocity of Propagation | 82% |
| Capacitance | ~16.2 pF/ft (53 pF/m) |
| Operating Temperature | -40°C to 80°C (-40°F to 176°F) |
| Bend Radius | 1 inch (25.4 mm) Minimum |
| Standard Lengths | 1000 ft Reels, Pre-cut (e.g., 50m, 100m) |
Technical Principles and Innovative Values:The 1786-RG6 is not just a standard video cable; it is optimized for the unique demands of industrial control networks.
- Innovation Point 1: Deterministic Signal Integrity. ControlNet operates on a scheduled time-slice (NUT – Network Update Time) where data must arrive predictably. The 1786-RG6‘s precise 75-ohm impedance and low-loss dielectric minimize signal attenuation and reflections. This prevents “jitter” and data errors that could disrupt the deterministic performance of the network, ensuring that I/O updates occur exactly when the PLC expects them.
- Innovation Point 2: Extreme EMI Immunity. The quad-shield design (two layers of aluminum foil plus two layers of tinned copper braid) provides >90% coverage, offering significantly better protection against electromagnetic interference (EMI) from VFDs and welding equipment than standard dual-shield cables. This is critical in heavy industrial settings like steel mills and mining operations.
- Innovation Point 3: Industrial Durability. Unlike consumer-grade RG-6, the 1786-RG6 features a heavy-duty PVC jacket resistant to oils, chemicals, and abrasion. Its wide operating temperature range allows it to be installed in both refrigerated warehouses and hot mill environments without degradation.
