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- Allen Bradley
- 1786-TPST2T
- ControlNet Coax Tap
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- 1 meter
- 3 kg
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Product Overview
The Allen Bradley 1786-TPST2T is a ControlNet IP67 TNC T-Tap assembly used to connect compatible field devices to a ControlNet coaxial network. It belongs to the Allen-Bradley Bulletin 1786 ControlNet media product family and provides a sealed branch connection between the network trunk and an individual ControlNet node.
The assembly consists of a TNC T-tap body and an integrated 1-meter coaxial drop cable with overmolded connectors. The cable uses a TNC connector at the tap body end and a straight TNC connector at the ControlNet device end.
Unlike conventional coaxial connectors, this assembly is intended for installations requiring sealed network connections. When properly mated with compatible sealed connectors, the tap and cable assembly provides IP67 environmental protection.
The 1786-TPST2T is particularly suitable for ControlNet installations where straight connector orientation is preferred for cable routing and equipment connection. It differs from the 1786-TPRT2T, which uses a right-angle TNC connector at the node end.
As a passive network component, the tap does not process communication data or regenerate network signals. Its purpose is to provide the physical coaxial connection required for a ControlNet node to communicate through the trunk network.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Allen-Bradley |
| Brand Owner | Rockwell Automation |
| Model | 1786-TPST2T |
| Product Series | Bulletin 1786 ControlNet |
| Product Type | ControlNet Coax Tap |
| Official Product Designation | ControlNet Coaxial IP67 TNC T-Tap |
| Network Type | ControlNet |
| Assembly Type | IP67 TNC T-Tap and Cable Assembly |
| Tap Configuration | T-Tap |
| Tap Body Connector | TNC |
| Cable Connector Arrangement | TNC to Straight TNC |
| Cable Type | Coaxial Drop Cable |
| Cable Length | 1 meter |
| Connector Construction | Overmolded |
| Protection Rating | IP67 when properly mated with a sealed connector |
| Operating Temperature | -20 to +70°C |
| Storage Temperature | -40 to +85°C |
| Relative Humidity | 5–95%, non-condensing |
| Shipping Weight | 3 kg |
Product Features
- IP67 TNC T-Tap Construction: Provides a sealed network tap arrangement for compatible ControlNet coaxial installations.
- Straight TNC Connector: Uses a straight TNC connector at the node end for conventional cable connection and routing.
- Integrated 1-Meter Drop Cable: Combines the tap body and drop cable into one assembly.
- Overmolded Connectors: Uses molded connector-to-cable interfaces to protect the connection assembly.
- ControlNet Compatibility: Provides a branch connection between the coaxial trunk and an individual network node.
- Sealed Connection Design: Supports installations requiring protection against dust and water ingress when properly connected.
- Industrial Temperature Range: Supports operation in ambient temperatures from -20 to +70°C.
- Simplified Installation: Eliminates the need to assemble a separate drop cable and tap connection.
- Straight Connector Orientation: Provides an alternative to right-angle TNC connections where installation clearance permits.
Product Working Principle
The 1786-TPST2T operates as a passive coaxial network tap in a ControlNet communication system. It provides the physical connection between the main coaxial trunk and an individual network device.
The T-tap body connects to the designated ControlNet network media, while the integrated 1-meter drop cable links the tap to the node. The cable has a TNC connector at the tap body end and a straight TNC connector at the device end.
When the assembly is correctly installed, ControlNet communication signals travel through the coaxial network infrastructure. The tap provides the required branch connection without independently processing, amplifying, or regenerating communication signals.
The straight TNC connector allows the drop cable to extend directly from the connected device. This arrangement is useful when the installation provides sufficient clearance for a straight connector and cable routing path.
The sealed connection interfaces also help maintain environmental protection. The IP67 rating applies when the assembly is properly mated with compatible sealed connectors.
A simplified connection arrangement is:
ControlNet Coaxial Trunk → 1786-TPST2T T-Tap → 1-Meter Drop Cable → ControlNet Node
The tap does not assign network addresses or manage communication traffic. These functions are handled by the connected ControlNet devices and network infrastructure.
Role in Allen-Bradley ControlNet Communication Architecture
Within an Allen-Bradley ControlNet installation, the 1786-TPST2T provides the physical media connection between the coaxial trunk and an individual network node.
ControlNet uses a coaxial trunk-and-tap topology. The trunk forms the main communication path, while individual taps connect controllers, communication modules, and other compatible devices to the network.
The 1786-TPST2T is used where a sealed TNC connection and straight drop cable arrangement are required.
| System Component | Function |
|---|---|
| ControlNet Coaxial Trunk | Main communication transmission path |
| 1786-TPST2T | IP67 TNC T-Tap with straight TNC drop cable |
| 1786-TPRT2T | IP67 TNC T-Tap with right-angle TNC drop cable |
| 1786-TCT2BD1 | IP67 TNC T-Tap with straight BNC drop connector |
| 1786-RG6 | Standard ControlNet coaxial trunk cable |
| 1786-RG6F | High-flex ControlNet coaxial cable |
| 1756-CNB | ControlLogix ControlNet Bridge Module |
| 1756-CNBR | ControlLogix Redundant ControlNet Bridge Module |
| ControlNet Terminators | Provide the required termination at both ends of the coaxial trunk |
The straight connector arrangement is particularly useful when the connected device provides sufficient front clearance for a direct cable connection.
Industrial Applications
The Allen Bradley 1786-TPST2T is suitable for ControlNet installations requiring sealed coaxial network connections and straight TNC cable routing.
| Industrial Application | Typical Use |
|---|---|
| Manufacturing Automation | Connecting ControlNet nodes in production equipment |
| Automotive Production | Establishing sealed network connections in machinery |
| Material Handling | Connecting communication nodes along automated conveyor systems |
| Packaging Machinery | Providing straight coaxial connections inside equipment enclosures |
| Process Automation | Connecting ControlNet communication devices in industrial facilities |
| Industrial Robotics | Establishing network connections around robotic equipment |
| Water Treatment | Supporting protected communication connections |
| Heavy Industrial Equipment | Providing sealed network taps in demanding environments |
| Distributed Control Systems | Connecting remote ControlNet nodes to the main network |
| Factory Control Networks | Maintaining branch connections between the trunk and individual devices |
Installation and Maintenance
- Verify the Model Number: Confirm that 1786-TPST2T is the required IP67 TNC T-Tap with a straight TNC drop connector.
- Check Network Compatibility: Verify that the connected equipment uses the appropriate ControlNet coaxial media and TNC connection arrangement.
- Inspect the Assembly: Examine the tap body, cable jacket, overmolded sections, and TNC connectors for physical damage.
- Plan Cable Routing: Identify a suitable installation path for the 1-meter drop cable and ensure sufficient clearance for the straight connector.
- Check Connector Compatibility: Confirm that the straight TNC connector matches the connection requirements of the target ControlNet node.
- Inspect Sealing Interfaces: Check the mating surfaces and sealing components before connecting the assembly.
- Install the Tap: Connect the T-tap body to the designated ControlNet network connection according to the system installation instructions.
- Connect the Drop Cable: Attach the straight TNC connector to the compatible ControlNet node.
- Verify Connector Engagement: Ensure that the TNC connectors are correctly engaged and secured according to the manufacturer’s instructions.
- Check Environmental Protection: Confirm that all required sealed connections are properly mated before relying on the IP67 protection rating.
- Test Network Communication: Check the connected node and ControlNet communication status after completing the installation.
- Perform Routine Inspection: Periodically inspect the cable jacket, connector interfaces, tap body, and installation arrangement for signs of wear or damage.
Compatible System Components
| Component | Function |
|---|---|
| Allen-Bradley 1786-TPST2T | IP67 TNC T-Tap with Straight TNC Drop Cable |
| Allen-Bradley 1786-TPRT2T | IP67 TNC T-Tap with Right-Angle TNC Drop Cable |
| Allen-Bradley 1786-TCT2BD1 | IP67 TNC T-Tap with Straight BNC Drop Connector |
| Allen-Bradley 1786-RG6 | Standard ControlNet Coaxial Cable |
| Allen-Bradley 1786-RG6F | High-Flex ControlNet Coaxial Cable |
| Allen-Bradley 1786-TNCLXT4 | ControlNet TNC 75 Ohm Terminator |
| Allen-Bradley 1756-CNB | ControlLogix ControlNet Bridge Module |
| Allen-Bradley 1756-CNBR | ControlLogix Redundant ControlNet Bridge Module |
Recommended Related Models
| Model | Product Type | Application |
|---|---|---|
| Allen-Bradley 1786-TPRT2T | ControlNet Coax Tap | IP67 TNC T-Tap with right-angle TNC connection |
| Allen-Bradley 1786-TCT2BD1 | ControlNet Coax Tap | IP67 TNC T-Tap with straight BNC connection |
| Allen-Bradley 1786-TPR | ControlNet Coax Tap | Right-angle coaxial network branch connection |
| Allen-Bradley 1786-TPS | ControlNet Coax Tap | Standard straight coaxial network branch connection |
| Allen-Bradley 1786-TPYR | ControlNet Coax Tap | Right-angle Y-type network branching arrangement |
| Allen-Bradley 1786-TPYS | ControlNet Coax Tap | Straight Y-type network branching arrangement |
Key Advantages
- Integrated ControlNet T-Tap and 1-meter drop cable assembly.
- Straight TNC connector arrangement.
- IP67 protection when properly mated with compatible sealed connectors.
- Overmolded connector construction.
- Compatible with ControlNet coaxial network infrastructure.
- Suitable for industrial installations requiring protected network connections.
Technical FAQs
1. What is the difference between 1786-TPST2T and 1786-TPRT2T?
Both models are ControlNet IP67 TNC T-Tap and cable assemblies with a 1-meter drop cable. The main difference is the node-side connector orientation. The 1786-TPST2T uses a straight TNC connector, while the 1786-TPRT2T uses a right-angle TNC connector.
2. Does the 1786-TPST2T include an integrated drop cable?
Yes. The assembly includes a T-tap body and a 1-meter coaxial drop cable with overmolded connectors. The cable has a TNC connector at the tap body end and a straight TNC connector at the ControlNet node end.
3. Is the 1786-TPST2T suitable for wet industrial environments?
The assembly is rated IP67 when properly mated with a compatible sealed connector. All mating interfaces must be correctly assembled to maintain the specified environmental protection.
4. Can the 1786-TPST2T replace a standard 1786-TPS tap?
Not necessarily. The 1786-TPST2T is an IP67 sealed TNC T-Tap assembly, whereas the 1786-TPS is a standard 1-meter coaxial straight T-Tap. The connector type, environmental protection requirements, and network installation configuration must be checked before selecting a replacement.