Configured for high-speed signal routing and physical media drop connections in ControlNet network topologies, the Allen-Bradley 1786-TPR (1786-TPR T-Tap Module) provides direct physical/electrical execution.
Hardware Specifications
Parameter
Specification
Model
1786-TPR
Brand
Allen-Bradley
Origin
USA / Global Manufacturing standard
Weight
0.35 lbs (0.16 kg)
Dimensions
Compact DIN-rail / inline drop tap form factor
Operating Temp
0 to 60 deg C (32 to 140 deg F)
Power Consumption
Passive physical media device (0 mA backplane power)
Cable Type
Coaxial right-angle T-tap
Connector Type
BNC connector
Cable Length
1 m cable
Compatibility
Allen-Bradley ControlNet coaxial network media
ControlNet Determinism & Backplane Bus Integration
The 1786-TPR connects ControlNet nodes to the coaxial trunk cable via a right-angle T-tap configuration, ensuring impedance matching and minimal signal reflection across deterministic communication channels. Designed for low latency, the tap maintains physical layer stability without introducing excessive propagation delays that could disrupt scheduled network traffic or backplane bus communication velocity across PLC racks.
Frequently Asked Questions
Q: What is the purpose of the 1-meter drop cable on the 1786-TPR?
A: The 1 m cable connects the tap body directly to the ControlNet node BNC connector, keeping the drop length within the mandatory physical media limits to prevent signal attenuation.
Q: Can the 1786-TPR be disconnected while the network is active?
A: Disconnecting the BNC connection from the node does not interrupt trunk line continuity; however, disconnecting the trunk cables from the tap breaks the physical segment link and disrupts downstream node synchronization.
Field Installation Guidelines
Inspect the 1 m coaxial cable and BNC connector for physical wear or pin damage before installation.
Mount the tap securely using standard mounting hardware or rail attachment to prevent mechanical stress on trunk cable joints.
Align and twist-lock the BNC connectors onto the trunk segment cables and node port until fully seated.
Maintain a minimum bend radius of 30 mm on the coaxial cable during routing to avoid signal reflections or shield degradation.
Ensure proper grounding of the coaxial cable shield at specified single-point network ground locations to suppress noise interference.
