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- Allen Bradley
- 1786-TNCLP4
- ControlNet Media Connector
- USA
- 50 × 20 × 40 mm
- 0.1 kg
- Xiamen, China
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Product Overview
The Allen-Bradley 1786-TNCLP4 is a plug-to-plug TNC coaxial connector used in Allen-Bradley ControlNet IP67 media installations. It features male TNC interfaces at both ends and serves as an adapter for joining two compatible female TNC connections.
Unlike the 1786-TNCL10, which is a single TNC cable plug used for cable termination, the 1786-TNCLP4 has a connector at each end. This configuration allows it to bridge two TNC jack interfaces without requiring an additional cable assembly.
A common application is connecting a ControlNet IP67 tap to an isolated bulkhead connector installed on an electrical enclosure. In this arrangement, the 1786-TNCLP4 provides the intermediate connection between the tap body and the bulkhead, allowing the coaxial media connection to pass through the panel.
This configuration is particularly useful in industrial installations where network equipment is mounted inside protected cabinets but the communication cable needs to extend into an external installation area. The threaded TNC interfaces provide mechanical engagement at both connection points.
The connector also belongs to the sealed ControlNet media component family. When fully mated with compatible components, it supports IP67 environmental protection, making it suitable for installations where ordinary exposed BNC connections would require additional protection.
Because it is a passive coaxial adapter, the 1786-TNCLP4 does not process network data, regenerate signals, or require an external power supply. Its function is to maintain the electrical connection between the two TNC interfaces while accommodating the physical arrangement of the network components.
When selecting this connector, it is important to distinguish between a plug-to-plug adapter, a jack-to-jack coupling, and a terminating resistor. These components may share the same TNC interface family, but their electrical and mechanical functions are different.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Brand | Rockwell Automation |
| Model | 1786-TNCLP4 |
| Product Series | ControlNet |
| Product Type | ControlNet Media Connector |
| Component Type | TNC Coaxial Barrel Connector |
| Connector Type | TNC |
| Connection Configuration | Plug-to-Plug |
| Connector Arrangement | Male TNC to Male TNC |
| Media Type | Coaxial |
| Network Compatibility | Allen-Bradley ControlNet |
| Environmental Protection | IP67 when fully mated |
| Operating Temperature | -20 to +80°C |
| Package Quantity | 4 pieces |
| Application | Connecting TNC Jack Interfaces |
| Dimensions | 50 × 20 × 40 mm |
| Weight | 0.1 kg |
Product Features
- Plug-to-Plug Configuration: Provides two male TNC interfaces for joining compatible female TNC connections.
- Barrel Connector Construction: Functions as an intermediate adapter between two TNC jack interfaces.
- IP67 Media Compatibility: Supports sealed connections when fully mated with compatible components.
- Threaded TNC Coupling: Provides mechanical retention at both ends of the connection.
- ControlNet Coaxial Compatibility: Intended for use in Allen-Bradley ControlNet TNC media arrangements.
- Passive Signal Transmission: Maintains the coaxial electrical path without requiring an external power supply.
- Bulkhead Connection Support: Can connect a ControlNet tap body to an isolated bulkhead connector.
- Compact Adapter Design: Allows two compatible interfaces to be joined without preparing an additional cable.
- Four-Piece Packaging: Supplied in a package containing four connectors.
- Industrial Media Integration: Suitable for sealed coaxial connection arrangements in industrial control installations.
Product Working Principle
The 1786-TNCLP4 establishes a direct coaxial connection between two female TNC interfaces through its male-to-male connector arrangement.
In a ControlNet coaxial network, communication signals travel through the center conductor of the cable. The surrounding dielectric and conductive shielding maintain the coaxial structure required for signal transmission.
The 1786-TNCLP4 has a male TNC connector at each end. When attached to two compatible female interfaces, its internal conductive path connects the center contacts while maintaining the corresponding outer conductor and shielding connection.
A typical connection arrangement is:
ControlNet TNC Tap → 1786-TNCLP4 → 1786-TNCJI4 Isolated Bulkhead → ControlNet Coaxial Cable
This configuration is particularly relevant when a sealed ControlNet tap needs to connect to an isolated bulkhead mounted through a cabinet panel.
The threaded interfaces provide mechanical retention and help prevent accidental separation caused by normal equipment vibration. When the connections are properly assembled with compatible sealed components, the media connection can maintain IP67 protection.
The 1786-TNCLP4 does not perform signal amplification, isolation, or network termination. It simply provides the electrical and mechanical connection between the two TNC interfaces.
This distinction is important when troubleshooting a ControlNet installation. If a network segment requires a 75-ohm termination, a dedicated terminating resistor must be used rather than this plug-to-plug adapter.
Role in Allen-Bradley ControlNet Network Architecture
The 1786-TNCLP4 serves as a passive interconnection component within the ControlNet IP67 coaxial media architecture. Its primary function is to connect compatible TNC jack interfaces, particularly where a tap assembly must be joined to an isolated bulkhead.
A typical installation uses the connector between the 1786-TCT2BD1 TNC tap and the 1786-TNCJI4 isolated bulkhead connector. The bulkhead provides the panel-mounted interface, while the plug-to-plug adapter establishes the connection between the two components.
A representative arrangement is:
ControlNet TNC Tap → 1786-TNCLP4 → 1786-TNCJI4 → ControlNet Coaxial Connection
| System Component | Function |
|---|---|
| Allen-Bradley 1786-TNCLP4 | Provides a male-to-male TNC connection between two compatible jack interfaces |
| 1786-TNCJI4 | Provides an isolated TNC jack-to-jack bulkhead connection |
| 1786-TCT2BD1 | Provides an IP67 TNC T-tap with a straight BNC drop connection |
| 1786-TNCL10 | Provides a male TNC connector for coaxial cable termination |
| 1786-TNCJ4 | Provides a TNC jack-to-jack bullet connector |
| 1786-TNCLXT4 | Provides a 75-ohm TNC terminating resistor plug |
| 1786-BNC2TNC | Provides an isolated BNC-to-TNC bulkhead connection |
| 1786-TPST2T | Provides a straight TNC-to-TNC ControlNet tap |
| 1786-TPRT2T | Provides a right-angle TNC-to-TNC ControlNet tap |
| 1786-RG6 | Provides the main ControlNet RG-6 coaxial trunk cable |
| 1786-RPFS | Provides short-distance fiber communication between ControlNet network sections |
The 1786-TNCLP4 is an adapter rather than a network tap or termination device. Its selection depends on the connector gender and mounting arrangement of the surrounding media components.
Industrial Applications
The 1786-TNCLP4 is used in industrial ControlNet installations where two female TNC interfaces need to be connected through a compact threaded adapter.
| Industrial Application | Typical Use |
|---|---|
| Automotive Manufacturing | Connecting sealed ControlNet taps to bulkhead interfaces in production-line cabinets |
| Food and Beverage Processing | Maintaining TNC connections in sealed industrial media installations |
| Chemical Processing | Joining coaxial interfaces in process control enclosures |
| Power Generation | Connecting ControlNet media components through electrical cabinet panels |
| Oil and Gas Automation | Establishing threaded coaxial connections in industrial communication systems |
| Water Treatment | Connecting TNC media interfaces in control equipment exposed to moisture |
| Packaging Machinery | Joining tap assemblies and panel-mounted connectors in machine enclosures |
| Steel Manufacturing | Maintaining coaxial media connections in distributed automation cabinets |
| Material Handling | Connecting ControlNet media components across conveyor control installations |
| General Manufacturing | Supporting installation and replacement of TNC coaxial connection components |
Installation and Maintenance
- Verify Connector Configuration: Confirm that both connection points have compatible female TNC interfaces suitable for the plug-to-plug adapter.
- Inspect the Adapter: Check both male TNC connectors for damaged threads, bent contacts, corrosion, or contamination.
- Identify the Connection Arrangement: Determine whether the adapter will connect a tap assembly to an isolated bulkhead or join another compatible TNC interface pair.
- Check Component Compatibility: Verify that the surrounding components belong to the appropriate ControlNet TNC media system and support the required environmental protection.
- Clean the Mating Interfaces: Remove dust, moisture, and other contaminants from the female TNC connection points before assembly.
- Align the First Connector: Position one end of the 1786-TNCLP4 carefully against the first female TNC interface to prevent cross-threading.
- Secure the First Connection: Engage the threaded coupling and tighten it according to the applicable connector installation requirements.
- Connect the Second Interface: Attach the opposite end to the second female TNC connector and ensure proper mechanical engagement.
- Check Mechanical Stability: Confirm that both connections are secure and that the adapter is not carrying excessive mechanical loads from unsupported cables or equipment.
- Verify Environmental Sealing: Ensure that both interfaces are fully mated with compatible sealed components before relying on IP67 protection.
- Test Network Communication: After installation, check the ControlNet network status and confirm that the connected devices communicate normally.
- Perform Routine Inspection: During scheduled maintenance, examine the TNC threads, connector contacts, and surrounding cable assemblies for wear or damage.
Avoid using the 1786-TNCLP4 as a substitute for a terminating resistor or an isolated bulkhead. These components perform different functions within the ControlNet media architecture. If communication problems occur after installation, inspect both mating interfaces before replacing active network equipment.
Compatible System Components
| Component | Function |
|---|---|
| Allen-Bradley 1786-TNCLP4 | TNC plug-to-plug barrel connector |
| Allen-Bradley 1786-TNCJI4 | Isolated TNC jack-to-jack bulkhead connector |
| Allen-Bradley 1786-TNCJ4 | TNC jack-to-jack bullet connector |
| Allen-Bradley 1786-TNCL10 | TNC coaxial cable connector plug |
| Allen-Bradley 1786-TNCLXT4 | TNC 75-ohm terminating resistor plug |
| Allen-Bradley 1786-BNC2TNC | Isolated BNC-to-TNC bulkhead connector |
| Allen-Bradley 1786-TCT2BD1 | IP67 TNC tap with straight BNC drop connector |
| Allen-Bradley 1786-TPST2T | Straight TNC-to-TNC ControlNet tap |
| Allen-Bradley 1786-TPRT2T | Right-angle TNC-to-TNC ControlNet tap |
| Allen-Bradley 1786-RG6 | Standard ControlNet RG-6 coaxial cable |
Recommended Related Models
| Model / Product | Product Type | Typical Application |
|---|---|---|
| Allen-Bradley 1786-TNCJ4 | ControlNet TNC Jack-to-Jack Connector | Joining two compatible male TNC cable connectors |
| Allen-Bradley 1786-TNCJI4 | ControlNet Isolated TNC Jack-to-Jack Connector | Providing an isolated panel bulkhead connection |
| Allen-Bradley 1786-TNCL10 | ControlNet Media TNC Connector Plug | Terminating compatible coaxial cable ends |
| Allen-Bradley 1786-TNCLXT4 | ControlNet TNC 75-Ohm Terminator Plug | Terminating a coaxial network segment |
| Allen-Bradley 1786-TCT2BD1 | ControlNet Media IP67 TNC Connector Tap | Providing a sealed ControlNet tap connection |
| Allen-Bradley 1786-BNC2TNC | ControlNet BNC-to-TNC Isolated Bulkhead Connector | Connecting BNC and TNC media interfaces |
Key Advantages
- Male-to-male TNC connection for compatible coaxial interfaces.
- Barrel-style adapter construction.
- Supports IP67 media connections when fully mated.
- Threaded coupling at both ends.
- Suitable for connecting ControlNet taps to isolated bulkhead interfaces.
- Passive operation without an external power supply.
- Supplied in a four-piece package.
Technical FAQs
1. What is the difference between the 1786-TNCLP4 and 1786-TNCL10?
The 1786-TNCL10 is a single male TNC connector used to terminate a coaxial cable. The 1786-TNCLP4 has male TNC connectors at both ends and functions as a plug-to-plug adapter between two female TNC interfaces.
2. How is the 1786-TNCLP4 used with the 1786-TNCJI4?
The 1786-TNCLP4 connects the isolated bulkhead connector to a compatible ControlNet tap body. In the 1786-TCT2BD1 installation arrangement, the adapter joins the tap body to the 1786-TNCJI4 bulkhead, allowing the drop cable to connect to the ControlNet node.
3. Can the 1786-TNCLP4 replace the 1786-TNCLXT4?
No. The 1786-TNCLP4 is a plug-to-plug coaxial adapter, whereas the 1786-TNCLXT4 contains a 75-ohm terminating resistor. Using the adapter in place of a required network terminator would leave the coaxial segment without the specified termination.
4. Does the 1786-TNCLP4 support IP67 protection?
Yes, it belongs to the ControlNet IP67 TNC media connector family. However, IP67 protection applies when the connector is fully mated with compatible sealed components. An improperly assembled or exposed connection should not be assumed to maintain this rating.