Description
Product Name: 1786-TCAP Allen Braley Controller module
Product details:
The Allen-Bradley 1786-TCAP is a specialized component within the ControlNet networking ecosystem. Specifically, it is a ControlNet Tap Terminator, designed to ensure signal integrity by preventing electrical reflections at the ends of a ControlNet segment.
1. Product Overview
The 1786-TCAP is a passive device used to “close” a ControlNet trunk cable segment. In any high-speed industrial network, signals that reach the end of a cable can “bounce” back, causing data corruption and communication errors. The 1786-TCAP absorbs these signals to maintain a clean communication environment.
2. Technical Specifications
Below are the key technical parameters for the 1786-TCAP:
| Feature | Specification |
| Network Type | ControlNet |
| Connector Type | BNC (Bayonet Neill–Concelman) |
| Impedance | 75 Ohms (Matched to RG-6 Coaxial cable) |
| Component Type | Passive Terminator |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C (-40°F to 185°F) |
| Mounting | Connects directly to a 1786-TPS, 1786-TPYS, or 1786-TPHS tap |
3. Product Advantages
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Signal Stability: Eliminates signal reflection, which is critical for the high-speed (5 Mbps) deterministic nature of ControlNet.
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Plug-and-Play: Requires no configuration or external power; it simply twists onto the BNC connector of the last tap in a segment.
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Robust Design: Built to withstand industrial environments, ensuring long-term reliability in factory automation settings.
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Standardized Compatibility: Fully compatible with all Allen-Bradley ControlNet media components and RG-6 coaxial systems.
4. Key Precautions & Installation Notes
Important: Failure to use terminators, or using the wrong type of terminator, is the leading cause of “intermittent” network errors in ControlNet systems.
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Two per Segment: Every ControlNet trunk cable segment must have exactly two terminators—one at each physical end of the segment.
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Correct Impedance: Never use a standard 50-ohm BNC terminator (common in old Ethernet or video systems). ControlNet requires the 75-ohm 1786-TCAP.
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Physical Connection: Ensure the BNC connection is tight. A loose terminator can cause the entire network segment to drop or experience high retry rates.
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Avoid Over-Termination: Do not place terminators in the middle of a segment; this will weaken the signal and cause communication failure.
5. Product Applications
The 1786-TCAP is used in any industrial architecture utilizing Allen-Bradley ControlNet, including:
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PLC/PAC Communication: Linking ControlLogix or PLC-5 controllers over long distances.
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Remote I/O: Connecting a main chassis to distant I/O racks.
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Drives & Motion Control: Synchronizing high-speed motor drives where timing is critical.
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Redundant Networking: Used in dual-media ControlNet setups (Media A and Media B) to ensure both paths are properly terminated.
Advantages: Foxboro, OVATION, TRICONEX, Allen-Bradley, ABB, Motorola, Siemens Moore, Ge Fanuc, Woodward, Bently Nevada and other major import brands!
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Colour：new Warranty: 12 months
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Price: Please contact us Product weight：0.515kg
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