Allen Bradley 1786-TPYS ControlNet Coaxial Straight Y-Tap

Product Overview

The Allen Bradley 1786-TPYS functions as a critical connection point within a ControlNet coaxial media system. This Y-Tap allows a node—such as a PLC, I/O chassis, or HMI—to connect to the trunk line without interrupting the signal flow to other devices. We offer this unit as 100% Brand New, ensuring factory-spec signal impedance and physical integrity for high-speed deterministic networks.

Technical Specifications

The 1786-TPYS integrates rugged industrial housing with precision-tuned internal circuitry to maintain network balance.

Engineering Advantages

• Non-Intrusive Node Integration: The 1786-TPYS allows for the addition or removal of nodes from the ControlNet network without breaking the trunk line continuity. This design prevents system-wide downtime during hardware maintenance or expansion.

• Optimized Signal Path: The "Straight" configuration and fixed 1-meter drop cable eliminate the guesswork of cable trimming. It provides a pre-measured, low-attenuation path that ensures your device meets the required signal-to-noise ratio for 5 Mbps data rates.

• Passive Reliability: Because the Y-Tap operates as a passive component, it requires no external power. It maintains network impedance (75 Ω) through high-quality internal coupling, effectively preventing signal reflections that cause packet loss.

• Rapid Deployment in Cabinets: The compact form factor excels in crowded PLC racks. The 1-meter pigtail provides sufficient reach to connect the trunk line mounted on the enclosure wall to a controller located in the center of the rack.

FAQs

• What is the difference between a "Straight" Y-Tap and a "Right-Angle" Tap?

  The 1786-TPYS features a straight cable exit, which suits deep enclosures where the cable can run directly outward from the tap. Right-angle versions (like the 1786-TPS) assist in shallow cabinets where bend radius constraints require the cable to exit parallel to the mounting surface.

• Does the 1-meter cable length affect network distance calculations?

  Yes. When calculating your total ControlNet segment length, you must include the 1-meter drop cable of each 1786-TPYS. Exceeding the maximum allowed segment length without a repeater can lead to timing errors.

• Can I shorten the integrated 1-meter BNC cable?

  We strongly advise against modifying the integrated drop cable. The factory-sealed BNC connection ensures electromagnetic shielding. Cutting or re-terminating the cable risks introducing impedance mismatches and EMI vulnerabilities.

• How do I terminate the unused ports on a 1786-TPYS?

  If you install a tap but do not yet have a node to connect, you must install a 75 Ω terminator (1786-XT) on the unused BNC port. This prevents signal reflections from crashing the entire network segment.