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- RH931RM
- Termination Cable
- USA
- 2 meters
- 3 kg
- Xiamen, China
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Product Overview
The Foxboro RH931RM is an I/A Series termination cable used to establish the electrical connection between termination hardware and associated I/A Series I/O equipment. It is part of the cabinet-level interconnection arrangement that carries field signal connections from the termination side toward the system I/O hardware.
In a typical Foxboro I/A Series installation, field instruments are wired to a termination assembly rather than directly to the I/O electronics. The termination hardware organizes the field connections, while the RH931RM provides the corresponding cable path to the associated I/O interface. This arrangement makes cabinet wiring easier to organize and simplifies replacement work when a cable or connected I/O component requires service.
The RH931RM is a passive interconnection component. It does not independently process process signals, execute control logic, or perform I/O conversion. Its function is to maintain the required electrical connection between the termination arrangement and the associated I/A Series hardware.
Technical Specifications
| Parameter | Specification |
|---|---|
| Product Model | RH931RM |
| Product Type | I/A Series Termination Cable |
| Product Family | Foxboro I/A Series |
| Series | I/A Series |
| Cable Function | I/O Termination Interconnection |
| System Role | Termination-to-I/O Signal Connection |
| Interface Function | Electrical Signal Interconnection |
| Component Type | Passive Cable Assembly |
| Application | I/A Series I/O Cabinet Wiring |
| Signal Path | Termination Hardware to Associated I/O Hardware |
| System Integration | Foxboro I/A Series Control System |
| Installation | Control-System Cabinet |
| Cable Length | 2 meters |
| Shipping Weight | 3 kg |
Product Features
- I/A Series termination cable for Foxboro control-system installations
- Provides the electrical interconnection between termination hardware and associated I/O equipment
- Supports organized field I/O wiring within the control cabinet
- Functions as a passive connection component rather than an active processing device
- Suitable for established I/A Series installations requiring cable replacement or maintenance
- Supports structured signal routing between field termination and I/O hardware
- Useful for cabinet refurbishment and service work
- Helps maintain the original termination-to-I/O wiring architecture
- Suitable for applications where the termination and I/O hardware are separated within the cabinet arrangement
Working Principle
The RH931RM carries the corresponding electrical connections between an I/A Series termination arrangement and the associated I/O hardware. For an analog or digital input circuit, the field instrument sends its signal through the field wiring to the termination assembly. The termination assembly organizes the connection, after which the signal continues through the RH931RM toward the appropriate I/A Series I/O hardware.
Field Device → Field Wiring → Termination Hardware → RH931RM → I/A Series I/O Hardware → Control System
For an output circuit, the direction is reversed. A control command generated by the I/A Series system passes through the I/O hardware, the RH931RM, and the termination arrangement before reaching the associated field device.
The cable itself does not interpret or modify the signal. Signal acquisition, conditioning, processing, and control functions are handled by the appropriate I/A Series system hardware. The RH931RM serves as the physical electrical path between the termination and I/O sections.
During maintenance, correct identification of both cable ends is important. The cable must be installed according to the applicable cabinet wiring arrangement so that each field point remains connected to its intended I/O channel.
Role in an I/A Series Control Architecture
The RH931RM occupies the interconnection layer between field termination and I/A Series I/O hardware. Keeping these functions separate allows field wiring to be organized at a termination point while the electronic I/O hardware remains part of the main control-system assembly.
| Control Architecture Layer | Typical Component | Relationship to RH931RM |
|---|---|---|
| Process Control | Foxboro I/A Series Controller | Executes process control strategies |
| I/O Processing | I/A Series I/O Module | Acquires or generates field signals |
| Termination Interconnection | RH931RM | Carries connections between termination and I/O hardware |
| Termination | I/A Series Termination Assembly | Organizes field wiring connections |
| Field Interface | Transmitters / Switches / Valves | Provides or receives process signals |
| Field Wiring | Instrument Cabling | Connects field devices to termination hardware |
| Process Equipment | Industrial Machinery | Generates or responds to controlled process conditions |
Industrial Applications
| Application | Typical Use |
|---|---|
| Process Control Systems | Connects I/A Series termination arrangements with associated I/O hardware |
| Chemical Processing | Supports structured field-instrument signal routing |
| Oil and Gas Facilities | Used within established I/A Series control cabinets |
| Power Generation | Maintains field I/O connections between termination and control hardware |
| Water and Wastewater | Supports organized instrumentation wiring |
| Manufacturing Plants | Provides cabinet-level I/O interconnection for automation systems |
| Process Instrumentation | Carries connections between field termination and I/O interfaces |
| System Maintenance | Replaces existing termination cables while retaining the established I/O architecture |
Installation and Maintenance
- Verify the part number — Confirm that RH931RM is the correct termination cable for the intended I/A Series installation.
- Review cabinet documentation — Check the applicable wiring drawings and I/O documentation before disconnecting the existing cable.
- Isolate the relevant system section — Follow the plant’s approved shutdown and electrical isolation procedure before working on the I/O cabinet.
- Identify both cable ends — Confirm the termination-side and I/O-side connection points and record their positions before removal.
- Inspect the replacement cable — Check the cable assembly for visible damage, contamination, deformation, or damaged connection areas.
- Remove the existing cable carefully — Disconnect the cable using the applicable maintenance procedure without placing unnecessary mechanical stress on the surrounding hardware.
- Verify cable routing — Compare the replacement routing with the original cabinet arrangement and avoid unnecessary crossing or mechanical strain.
- Install the replacement cable — Connect the cable to the designated termination and I/O interfaces and ensure that each connection is properly seated.
- Check point identification — Confirm that the cable connections correspond to the intended I/O points and termination positions.
- Verify electrical continuity — Where required by the maintenance procedure, perform appropriate continuity checks before restoring the system to operation.
- Perform a controlled signal test — After energization, verify the affected I/O points for expected signal behavior and check for unexpected diagnostics or communication abnormalities.
- Record the maintenance work — Document the installed model, affected cabinet location, and any relevant inspection or replacement details for future service activities.
Related Components
| Component | Function |
|---|---|
| Foxboro I/A Series I/O Module | Acquires or generates process I/O signals |
| I/A Series Termination Assembly | Provides the field wiring termination point |
| I/A Series Controller | Executes process control strategies |
| Field Wiring | Connects field instruments to the termination arrangement |
| Field Transmitter | Provides process measurement signals |
| Control Valve / Actuator | Receives control signals from the I/O system |
| I/O Cabinet | Houses termination and I/O hardware |
| Cabinet Wiring Documentation | Defines the intended field-to-I/O connection arrangement |
Recommended Related Models
| Model / Product Family | Product Type | Typical Relationship |
|---|---|---|
| Foxboro P0916DB | I/A Series Termination Cable | Related I/A Series termination cable |
| Foxboro RH916DB | I/A Series Termination Cable | Related termination cable configuration |
| Foxboro AD202MU | I/A Series Termination Cable | Related I/A Series cabinet interconnection |
| Foxboro P0931RM | I/A Series Termination Cable | Related termination cable family |
| Foxboro I/A Series Termination Cables | Termination Cable Family | Associated cabinet-level I/O interconnection hardware |
Key Advantages
- Provides a dedicated interconnection between I/A Series termination and I/O hardware
- Supports organized cabinet-level field signal routing
- Maintains the established Foxboro I/A Series termination architecture
- Functions as a passive signal connection rather than an active processing component
- Suitable for maintenance and replacement work on established I/A Series systems
- Supports structured separation between field termination and I/O electronics
Technical FAQs
Where is the RH931RM used in an I/A Series installation?
The RH931RM is used in the interconnection path between I/A Series termination hardware and associated I/O equipment. It forms part of the cabinet wiring arrangement that links field termination with the electronic I/O section.
Does the RH931RM process or convert field signals?
No. The RH931RM is a passive termination cable. Signal acquisition, processing, and control functions are performed by the associated I/A Series I/O and control-system hardware.
What should be verified when replacing an RH931RM?
The cable part number, termination-side connection, I/O-side connection, cabinet routing, and affected I/O point identification should all be checked. The replacement should reproduce the intended wiring arrangement rather than relying only on physical appearance.
How can an incorrect termination cable connection be detected after installation?
After installation, the affected I/O points should be checked against the cabinet documentation and subjected to an appropriate controlled signal test. Unexpected channel behavior, missing signals, or system diagnostics can indicate an incorrect connection or another wiring issue that requires further inspection.