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Phone: +86 16626708626Description
3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | RH931RQ (supersedes P0931RQ) |
| Cable Type | Type 4 |
| Length | 2.0 m (6.6 ft) |
| Jacket Material | Polyurethane (P) outer jacket |
| Conductor Insulation | Semi-rigid PVC |
| Connector (Baseplate End) | 37-pin D-subminiature |
| Connector (TA End) | 37-pin D-subminiature |
| Wire Gauge | 26 AWG typical |
| Temperature Rating | –20 to +70 °C (–4 to +158 °F) typical for P/PVC |
| Compatible Modules | FBM discrete and analog modules using Type 4 cables (e.g., FBM217, FBM219, FBM238, FBM241 series, FBM242, and others) |
| Application | Baseplate to Main Termination Assembly (TA) connection |
| Environment | Suitable for Class G3 (harsh) environments when used with compatible FBMs and TAs |
4. Product Introduction
The Foxboro RH931RQ is a 2-meter Type 4 termination cable that connects an I/A Series 200 Series Fieldbus Module baseplate to the main Termination Assembly (TA). It carries field I/O signals between the FBM and the DIN-rail mounted TA using 37-pin D-subminiature connectors on both ends.
The cable uses a polyurethane outer jacket with semi-rigid PVC conductor insulation for mechanical durability and chemical resistance in industrial environments. It is the direct replacement for the earlier P0931RQ and is specified for modules that require Type 4 cabling, including many discrete I/O FBMs such as the FBM242 family. The fixed 2 m length is the most common intermediate run for local cabinet or adjacent-cabinet installations.
- RH931RQ
- RH931RQ
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| Module online but no field I/O | Cable disconnected, damaged, or wrong type | ✅ High | Visually inspect both 37-pin connectors for bent pins or incomplete seating; verify cable part number is RH931RQ / Type 4 | Reseat connectors firmly; replace cable if pins are damaged or continuity fails |
| Intermittent channel faults | Loose connector, damaged conductors, or excessive bend radius | ✅ High | Wiggle test both ends while monitoring channel status; check for cuts or crushed sections | Replace cable; maintain minimum bend radius and strain relief |
| Multiple modules on same baseplate affected | Shared cable or baseplate issue | ❌ Medium | Swap with a known-good RH931RQ of same length | If problem follows the cable, replace it; if not, investigate baseplate or TA |
| Communication or I/O errors after cable swap | Incorrect cable type (Type 1 vs Type 4) or wrong length | ✅ High | Confirm part number and length match the original installation drawing | Use only Type 4 cables of the correct length specified for the FBM/TA pair |
| Physical damage visible | Abrasion, chemical attack, or over-tight zip ties | ✅ High | Inspect entire length for jacket cuts, crushed sections, or exposed conductors | Replace immediately; do not attempt field repair of multi-conductor termination cables |
If the issue persists after cable replacement, capture photos of both connectors, the baseplate slot, and the TA, then contact technical support with the exact FBM and TA part numbers.
6. Frequently Asked Questions (FAQ)
Q: What does “Type 4” mean for this cable? Type 4 is the Foxboro designation for the specific pinout and conductor arrangement used between the FBM baseplate and the main Termination Assembly for many discrete and certain analog modules. Using a Type 1 or other cable will result in incorrect signal mapping.
Q: Is the same as P0931RQ? Yes. supersedes the earlier P0931RQ. They are functionally identical 2 m Type 4 P/PVC cables.
Q: Can I use a longer or shorter cable instead? Only if the installation drawing and voltage-drop calculations allow it. Foxboro offers Type 4 cables from 0.5 m to 30 m. Using a different length is acceptable only when the total run stays within the module’s specified maximum cable distance and the correct Type 4 pinout is maintained.
Q: Does this cable work with FBM242? Yes. FBM242 and many other discrete-output modules use Type 4 baseplate-to-main-TA cables. Confirm your specific TA and any expansion cables required for the complete installation.
Q: Why is new surplus pricing lower than current Schneider list? These are genuine OEM cables from excess or decommissioned stock. They have not been installed in continuous service. Every cable is visually inspected for connector integrity and jacket condition before shipment.
Q: Are the connectors gendered the same on both ends? Both ends use 37-pin D-subminiature connectors configured for the Foxboro baseplate-to-TA interface. They are not interchangeable with standard PC serial cables.
Q: Can the cable be repaired in the field if a pin is bent? No. Bent or damaged pins or conductors require full cable replacement. Field repairs risk intermittent faults and are not recommended for process I/O.
