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- Allen Bradley
- 1786-TCT2BD1
- ControlNet Media IP67 TNC Connector Tap
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- 1 meter
- 3 kg
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Product Overview
The Allen-Bradley 1786-TCT2BD1 is a sealed ControlNet IP67 tap assembly used to connect coaxial network trunk cables to industrial automation devices in environments where moisture, dust, and other contaminants are a concern.
Unlike conventional ControlNet BNC tap assemblies, this model uses a threaded TNC connection at the tap body to provide a sealed interface. It comes with a 1-meter removable drop cable, featuring a TNC connector at the tap end and a straight BNC connector at the device end.
This arrangement is particularly useful when ControlNet trunk cables run outside electrical cabinets or through production areas exposed to water spray, dust, and industrial cleaning operations. The sealed tap protects the trunk-side connection, while the drop cable provides the connection to the ControlNet node.
For example, in a food-processing facility, a ControlNet network may run along production equipment where washdown procedures are routinely performed. The 1786-TCT2BD1 allows the network tap connection to use a sealed TNC interface rather than leaving a conventional exposed BNC connection at the installation point.
One important installation detail is that the IP67 protection applies when the tap and cable are properly mated with compatible sealed connectors. The BNC connector at the node end of the supplied drop cable is IP20-rated, not IP67-rated. Consequently, the connected device must be installed in an appropriately protected enclosure or environment.
The 1786-TCT2BD1 is a passive coaxial network tap. It does not amplify signals, process ControlNet data, or require an independent power supply. Its function is to provide a properly connected branch between the ControlNet trunk and the associated network device.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Brand | Rockwell Automation |
| Model | 1786-TCT2BD1 |
| Product Series | ControlNet |
| Product Type | ControlNet Media IP67 TNC Connector Tap |
| Component Type | IP67 ControlNet Tap and Cable Assembly Kit |
| Network Compatibility | Allen-Bradley ControlNet |
| Media Type | RG-6 Coaxial |
| Tap Connector | TNC |
| Drop Cable Length | 1 meter |
| Tap-End Connector | TNC |
| Node-End Connector | Straight BNC |
| Connector Construction | Overmolded Connectors |
| Enclosure Protection | IP67 when properly mated to a sealed connector |
| Node-End Connector Protection | IP20 |
| Operating Temperature | -20 to +70°C |
| Storage Temperature | -40 to +85°C |
| Application | Sealed ControlNet Coaxial Network Connection |
| Cable Length | 1 meter |
| Shipping Weight | 3 kg |
Product Features
- IP67 Sealed Tap Construction: Provides protection against dust and water ingress when connected with compatible sealed interfaces.
- Threaded TNC Interface: Uses a threaded connector at the tap body for a secure sealed connection.
- Integrated 1-Meter Drop Cable: Includes a removable cable assembly for connecting the tap to a ControlNet node.
- TNC-to-BNC Configuration: Features a TNC connector at the tap end and a straight BNC connector at the node end.
- Overmolded Connectors: Provides additional mechanical protection around the cable termination points.
- ControlNet RG-6 Compatibility: Connects to the coaxial media architecture used in ControlNet networks.
- Industrial Environmental Protection: Suitable for installations where conventional exposed media connections require additional sealing.
- Passive Network Operation: Does not require a separate power supply or configuration.
- Removable Drop Cable: Allows the cable assembly to be disconnected for maintenance or equipment replacement.
- Compact Tap Arrangement: Provides a sealed branch connection without requiring a separate active communication module.
Product Working Principle
The 1786-TCT2BD1 provides a branch connection between a ControlNet coaxial trunk and an individual network node.
ControlNet uses a shared coaxial communication medium. The trunk cable carries network signals through the installation, while taps provide connection points for individual controllers, communication modules, and other network devices.
The 1786-TCT2BD1 uses a sealed TNC tap interface to connect to the network trunk. Its integrated drop cable carries the communication signals from the tap body to the connected node through a straight BNC connector.
A simplified connection arrangement is:
ControlNet RG-6 Trunk → IP67 TNC Tap → 1-Meter TNC-to-BNC Drop Cable → ControlNet Node
The tap maintains the required electrical connection to the coaxial trunk while providing a sealed interface at the exposed connection point.
The threaded TNC connection helps maintain the environmental seal when properly assembled with compatible sealed components. The overmolded cable connectors also protect the cable termination areas against mechanical exposure.
It is important to distinguish between the protection ratings of the two ends. The sealed tap-side connection can achieve IP67 protection when properly mated, but the BNC connector at the node end is rated IP20. The entire installation therefore cannot automatically be considered IP67 simply because this tap assembly is used.
The module is passive and does not perform signal regeneration or data processing. Network communication continues through the electrical transmission characteristics of the ControlNet coaxial system.
Role in Allen-Bradley ControlNet Network Architecture
The 1786-TCT2BD1 provides an environmentally sealed tap connection within an Allen-Bradley ControlNet coaxial network. It is particularly relevant where the network trunk passes through areas that require additional protection against water and dust.
A typical arrangement is:
ControlNet RG-6 Trunk → 1786-TCT2BD1 → 1-Meter TNC-to-BNC Drop Cable → ControlNet Communication Device
| System Component | Function |
|---|---|
| Allen-Bradley 1786-TCT2BD1 | Provides an IP67 sealed ControlNet tap with a 1-meter drop cable |
| 1786-RG6 | Provides the main RG-6 coaxial trunk cable |
| 1786-TNCL10 | Provides a straight TNC coaxial connector |
| 1786-TNCLP4 | Provides a TNC plug-to-plug coaxial connection |
| 1786-TNCJI4 | Provides an isolated TNC jack-to-jack connection |
| 1786-BNC2TNC | Connects BNC and TNC coaxial media interfaces |
| 1786-TNCLXT4 | Provides a 75-ohm TNC terminating connector |
| 1786-TPS | Provides a conventional straight BNC T-tap |
| 1786-TPR | Provides a conventional right-angle BNC T-tap |
| 1786-TCAP | Terminates unused ControlNet tap connections |
| ControlNet Communication Modules | Connect PLC controllers to the network |
The 1786-TCT2BD1 is especially useful when a sealed tap is needed at the trunk connection, while the connected node remains protected separately through an appropriate enclosure or installation arrangement.
Industrial Applications
The 1786-TCT2BD1 is suitable for ControlNet installations where coaxial network connections must accommodate more demanding environmental conditions.
| Industrial Application | Typical Use |
|---|---|
| Food and Beverage Processing | Connecting ControlNet equipment in areas exposed to routine washdown |
| Pharmaceutical Manufacturing | Providing sealed network tap connections in production environments |
| Automotive Manufacturing | Connecting distributed automation equipment in industrial production areas |
| Chemical Processing | Protecting network trunk connections in areas exposed to moisture and contaminants |
| Water Treatment | Connecting ControlNet nodes near treatment equipment and wet process areas |
| Packaging Machinery | Providing sealed coaxial connections around production machinery |
| Mining Operations | Protecting network tap connections in dusty industrial environments |
| Oil and Gas Facilities | Connecting automation equipment in areas requiring sealed media interfaces |
| Material Handling | Connecting distributed network devices in industrial operating areas |
| General Manufacturing | Providing protected ControlNet trunk connections outside conventional control cabinets |
Installation and Maintenance
- Verify Network Compatibility: Confirm that the installation uses an Allen-Bradley ControlNet coaxial network and compatible RG-6 media components.
- Inspect the Tap Assembly: Check the tap body, threaded TNC interface, drop cable, and overmolded connectors for visible damage.
- Check Connector Configuration: Confirm that the tap-side connection is TNC and the node-side connection is straight BNC.
- Prepare the Trunk Connection: Ensure that the corresponding sealed TNC connector on the ControlNet trunk is clean and compatible with the tap assembly.
- Connect the TNC Interface: Align and tighten the threaded connector according to the applicable installation instructions to establish the sealed connection.
- Protect the Cable Route: Route the 1-meter drop cable away from sharp edges, moving machinery, and areas where it could be crushed.
- Observe the IP67 Boundary: Remember that IP67 protection applies to properly mated sealed interfaces. Do not assume that the BNC node-end connector has the same protection rating.
- Protect the Connected Device: Install the BNC-connected ControlNet node in an appropriately protected enclosure when the surrounding environment requires protection against water or dust.
- Check Cable Connections: Verify that the BNC connector is properly seated and that the drop cable is not under excessive mechanical tension.
- Verify Trunk Termination: Confirm that the ControlNet coaxial segment has the required 75-ohm terminating resistors at both ends.
- Test Network Communication: Restore the network and verify that the connected node communicates normally with the other ControlNet devices.
- Inspect Sealing During Maintenance: Check threaded connections, connector surfaces, cable overmolding, and protective sealing components for deterioration or contamination.
During maintenance, pay particular attention to the threaded TNC interface. A damaged or improperly assembled sealing connection can compromise the environmental protection of the tap even when the coaxial communication path remains electrically functional.
Compatible System Components
| Component | Function |
|---|---|
| Allen-Bradley 1786-TCT2BD1 | IP67 ControlNet TNC tap with 1-meter TNC-to-BNC drop cable |
| Allen-Bradley 1786-RG6 | Standard ControlNet RG-6 coaxial trunk cable |
| Allen-Bradley 1786-RG6F | High-flex ControlNet coaxial cable |
| Allen-Bradley 1786-TNCL10 | Straight TNC coaxial connector |
| Allen-Bradley 1786-TNCLP4 | TNC plug-to-plug coaxial connector |
| Allen-Bradley 1786-TNCJI4 | Isolated TNC jack-to-jack connector |
| Allen-Bradley 1786-TNCLXT4 | TNC 75-ohm terminating connector |
| Allen-Bradley 1786-BNC2TNC | BNC-to-TNC coaxial connector |
| Allen-Bradley 1786-TPS | Straight BNC ControlNet tap |
| Allen-Bradley 1786-TPR | Right-angle BNC ControlNet tap |
| Allen-Bradley 1786-TCAP | ControlNet media dummy load connector |
Recommended Related Models
| Model / Product | Product Type | Typical Application |
|---|---|---|
| Allen-Bradley 1786-TPST2T | ControlNet IP67 Straight TNC Tap and Cable Assembly | Sealed TNC-to-TNC node connections |
| Allen-Bradley 1786-TPRT2T | ControlNet IP67 Right-Angle TNC Tap and Cable Assembly | Right-angle sealed TNC node connections |
| Allen-Bradley 1786-TPS | ControlNet Straight BNC T-Tap | Conventional coaxial trunk connections |
| Allen-Bradley 1786-TPR | ControlNet Right-Angle BNC T-Tap | Alternative BNC tap installation |
| Allen-Bradley 1786-TNCLXT4 | ControlNet TNC 75-Ohm Terminator Plug | Terminating compatible TNC network segments |
| Allen-Bradley 1786-BNC2TNC | ControlNet BNC-to-TNC Coaxial Connector | Connecting different coaxial connector interfaces |
Key Advantages
- Sealed IP67 tap connection when properly mated.
- Integrated 1-meter removable drop cable.
- Threaded TNC connection at the tap body.
- Straight BNC connection at the ControlNet node end.
- Overmolded connector construction.
- Suitable for industrial environments exposed to dust and moisture.
- Passive connection without an independent power supply.
Technical FAQs
1. What connectors are used on the Allen-Bradley 1786-TCT2BD1?
The assembly uses a TNC connector at the tap body and a straight BNC connector at the ControlNet node end. The supplied drop cable is 1 meter long and has overmolded connectors.
2. Is the entire 1786-TCT2BD1 assembly IP67-rated?
No. The sealed tap and cable achieve IP67 protection when properly mated with compatible sealed connectors. However, the BNC connector at the node end is IP20-rated. Additional enclosure protection is necessary if the connected device is installed in an environment requiring IP67 protection.
3. What is the difference between the 1786-TCT2BD1 and 1786-TPST2T?
Both belong to the ControlNet IP67 tap and cable assembly family. The 1786-TCT2BD1 uses a TNC connector at the tap body and a straight BNC connector at the node end. The 1786-TPST2T uses TNC connectors at both ends of its drop cable.
4. Can the 1786-TCT2BD1 connect directly to an RG-6 ControlNet trunk?
Yes, it is intended for use in the ControlNet coaxial media system. The installation requires the appropriate compatible TNC connection hardware at the trunk interface. The threaded connection must be properly assembled to maintain the required environmental seal.