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- P0926TM-8FT
- Remote Fieldbus Cable Assembly
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- 2.4 meters
- 3 kg
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Product Overview
The Foxboro P0926TM-8FT is a remote fieldbus cable assembly used in Foxboro I/A Series distributed control system (DCS) installations. Its 8-foot cable provides a pre-terminated connection between compatible Fieldbus Modules (FBMs) and remote termination assemblies (RTAs), helping establish the required electrical connection within a distributed control architecture.
In a control cabinet, fieldbus connections must be routed between modules and their associated termination hardware without introducing wiring errors or disrupting neighboring signal circuits. The P0926TM-8FT provides a prepared cable assembly for this connection, reducing the need to fabricate a cable and terminate individual conductors during installation or maintenance.
The assembly is particularly relevant when an I/A Series system uses remote termination arrangements or when a control cabinet layout places the fieldbus module and its termination interface at separate connection points. During a replacement, the correct cable reference and connector arrangement matter: a cable that fits mechanically may still have a different pin assignment or serve a different connection within the system.
For maintenance engineers, this cable is a connection component rather than an active communication device. It does not process control logic or independently convert fieldbus signals. Its function is to maintain the intended electrical path between compatible system components, while the FBMs, termination assemblies, and control processors perform their respective control and signal-handling functions.
Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Foxboro |
| Model | P0926TM-8FT |
| Product Family | I/A Series |
| Product Type | Remote Fieldbus Cable Assembly |
| Cable Length | 2.4 meters |
| Cable Construction | Shielded cable assembly |
| Connection Type | Factory-terminated connectors |
| Typical Connection | Compatible FBM-to-RTA arrangement |
| System Application | Distributed control system fieldbus interconnection |
| Operating Function | Electrical signal interconnection |
| Shipping Weight | 3 kg |
Product Features
- Pre-terminated cable assembly: Provides prepared connections for compatible I/A Series fieldbus equipment.
- Remote fieldbus interconnection: Supports the connection between designated fieldbus modules and termination hardware.
- Shielded cable construction: Helps limit electromagnetic interference when installed according to the system wiring requirements.
- Defined cable length: Supports cabinet layouts that require a short connection between designated interfaces.
- Maintenance replacement: Allows a matching assembly to be replaced without fabricating a new cable.
- Passive operation: Requires no independent power supply or signal-processing electronics.
Working Principle
The P0926TM-8FT provides the physical electrical path between compatible fieldbus system components. Its conductors carry the signals required by the designated connection, while the cable assembly and its connectors maintain the intended wiring arrangement.
A typical connection can be represented as:
Foxboro Fieldbus Module (FBM) → P0926TM-8FT Cable Assembly → Remote Termination Assembly (RTA)
When the control system exchanges signals through the connected fieldbus hardware, the cable carries those signals between the relevant interfaces. The assembly itself does not interpret data, execute control logic, or regenerate communication signals. Correct operation depends on the connected modules, termination hardware, connector pinout, and system configuration.
Shielding is relevant in industrial cabinets where signal wiring may run near power supplies, motor-control equipment, relays, or other sources of electrical noise. The cable must be routed and grounded according to the applicable I/A Series installation requirements. Incorrect shield termination, damaged conductors, or a poorly seated connector can interrupt communication even when the connected modules are functioning correctly.
When a fieldbus-related fault appears after maintenance, the cable assembly should be checked alongside the module and termination hardware. Confirming the part number, connector engagement, cable condition, and wiring arrangement helps distinguish a connection problem from a fault in the active control equipment.
Role in the Foxboro I/A Series Control Architecture
The P0926TM-8FT serves as a passive interconnection between compatible fieldbus hardware. It supports the physical wiring arrangement that allows the control system’s fieldbus modules and termination components to operate as intended.
I/A Series Control System → Fieldbus Module (FBM) → P0926TM-8FT → Remote Termination Assembly (RTA) → Associated Field Wiring
| System Element | Function |
|---|---|
| P0926TM-8FT | Carries signals through the designated fieldbus connection |
| Fieldbus Module (FBM) | Interfaces process signals with the control system |
| Remote Termination Assembly (RTA) | Provides the corresponding field wiring termination interface |
| Control Processor | Executes control logic and coordinates system operation |
| Field Instruments | Measure process conditions or receive control commands |
| Cabinet Wiring | Connects the assembly to the intended module and termination points |
Industrial Applications
| Application | Practical Use |
|---|---|
| Process Control Cabinets | Connecting compatible fieldbus modules to termination assemblies |
| Chemical Processing | Maintaining fieldbus wiring within distributed control panels |
| Oil and Gas Facilities | Supporting module-to-termination connections in I/A Series installations |
| Power Generation | Maintaining control-system interconnections in process and utility cabinets |
| Water Treatment Plants | Supporting fieldbus wiring in compatible control-system configurations |
| DCS Maintenance | Replacing a matching cable assembly during troubleshooting |
| Control System Expansion | Connecting designated fieldbus hardware in an approved cabinet arrangement |
| Remote I/O Installations | Maintaining the required electrical connection between compatible fieldbus components |
Installation and Maintenance
- Verify the complete part number: Confirm P0926TM-8FT before removing the existing cable or selecting a replacement.
- Identify both connection points: Confirm the intended FBM and RTA interfaces against the system wiring documentation.
- Check connector compatibility: Verify the connector type, keying, and pin assignment rather than relying on physical appearance alone.
- Isolate the relevant equipment: Follow the plant’s maintenance procedure before disconnecting control-system wiring.
- Inspect the existing cable: Check for damaged insulation, crushed sections, excessive bending, and signs of heat or chemical exposure.
- Examine the connectors: Look for damaged contacts, contamination, broken locking features, or loose connector housings.
- Route the cable appropriately: Keep it clear of sharp edges, moving components, and sources of electrical interference according to the cabinet wiring design.
- Maintain shielding continuity: Follow the system’s specified shield termination and grounding arrangement.
- Connect the assembly correctly: Align the connectors with the intended interfaces and secure them without forcing the connection.
- Verify the wiring arrangement: Check that the cable connects the correct module and termination points before restoring operation.
- Test the fieldbus connection: Confirm module status and relevant communication indications after the system is returned to service.
- Record the maintenance work: Document the cable reference, connected interfaces, replacement date, and any faults identified during inspection.
Compatible System Components
| Component | Function |
|---|---|
| Foxboro P0926TM-8FT | Provides the remote fieldbus cable connection |
| Foxboro Fieldbus Module (FBM) | Interfaces process signals with the DCS |
| Remote Termination Assembly (RTA) | Provides the associated field wiring termination |
| I/A Series Control Processor | Executes control logic and coordinates system operation |
| Fieldbus Interface Hardware | Supports the configured fieldbus connection |
| Cabinet Terminal Assemblies | Organize designated electrical connections |
| Control Cabinet Wiring | Routes signals between the module and termination hardware |
| Field Instrument Wiring | Connects process instruments and associated I/O channels |
Recommended Related Models
| Model | Product Type | Typical Application |
|---|---|---|
| Foxboro P0926TM | Remote Fieldbus Cable Assembly | Comparing the base cable assembly reference |
| Foxboro P0926TM-8FT | 8-Foot Remote Fieldbus Cable Assembly | Replacement of the matching cable assembly |
| Foxboro P0926AC | I/A Series Cable Assembly | Evaluating a related cable reference after confirming the interface |
| Foxboro FBM Series | Fieldbus Module | Providing the fieldbus interface within the control system |
| Foxboro RTA Series | Remote Termination Assembly | Terminating field wiring associated with compatible modules |
| Foxboro I/A Series Control System | Distributed Control System | Integrating fieldbus modules and termination hardware into process control |
Key Advantages
- Provides a prepared connection for compatible I/A Series fieldbus equipment.
- Reduces the need for field fabrication of individual cable terminations.
- Supports replacement of a matching cable assembly during control-system maintenance.
- Helps preserve the intended wiring arrangement between fieldbus modules and termination hardware.
Technical FAQs
What equipment does the P0926TM-8FT connect?
It is associated with remote fieldbus connections in Foxboro I/A Series installations, including compatible FBM-to-RTA arrangements. The exact connection should be confirmed against the installed system’s wiring documentation.
Does the P0926TM-8FT process or convert fieldbus signals?
No. It is a passive cable assembly. Signal processing and control functions are performed by the connected fieldbus modules and control-system hardware.
What should be checked when replacing this cable in an existing cabinet?
Confirm the complete part reference, connector arrangement, pin assignment, cable routing, and shield termination. Also ensure the replacement connects to the same designated interfaces as the original assembly.
Could a damaged cable cause intermittent fieldbus communication faults?
Yes. Damaged conductors, loose connectors, or incorrect shield termination can interrupt the electrical connection or increase susceptibility to interference. Inspect the cable and its connections before concluding that the active fieldbus module has failed.