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Key Technical Specifications
| Parameter | Value |
|---|---|
| Part Number | FCM2F2 (RH914YZ) |
| Brand | Foxboro by Schneider Electric |
| Series | Foxboro I/A Series |
| Product Type | Fieldbus Communication Module (FCM) |
| Function | Fiber optic communication extender for 200 Series fieldbus modules |
| Data Rate | 2 Mbps |
| Max Fiber Distance | 2 km (1.24 mi) substrate-to-substrate |
| Fiber Type | Multimode, graded-index glass fiber |
| Fiber Core | 62.5 micron |
| Fiber Cladding | 125 micron |
| Numerical Aperture (NA) | 0.275 |
| Max Signal Loss (1300 nm) | 1 dB/km |
| Max Signal Loss (850 nm) | 3.6 dB/km |
| Connector Type | ST-type connectors |
| Redundancy | Mounted in pairs on baseboards for redundancy |
| Enclosure | Rugged extruded aluminum |
| LED Indicators | 6 LEDs on front panel for network/activity/status |
| Hot-Swappable | Yes — can be inserted/removed without power failure |
| Baseboard Mounting | Mounted on standard baseboard (supports up to 8 FBMs/FCMs) |
| Environmental Rating | Up to Class G (ISA Standard S71.04) |
| EMI/RFI Protection | Fiber optic cable unaffected by electrical noise (EMI, RFI, lightning) |
| Electrical Isolation | Protects against voltage differences and ground loops |
| Availability | Used / New Surplus, limited stock |
| Price Reference | ~$1,211.99 |
Product Introduction
Foxboro FCM2F2 RH914YZ is a Fieldbus Communication Module (FCM) from the Foxboro I/A Series, designed as a fiber optic communication extender for 200 Series fieldbus modules. It enables remote mounting of fieldbus modules near plant processes while maintaining high-speed data transfer over fiber optic networks.
The module supports 2 Mbps data rate with up to 2 km substrate-to-substrate fiber optic distance using multimode graded-index glass fiber (62.5μm core, 125μm cladding, 0.275 NA). FCMs are mounted in pairs on standard baseboards for redundancy, and the module is hot-swappable for easy maintenance. Its rugged extruded aluminum enclosure provides protection up to Class G environmental rating (ISA S71.04), and fiber optic cabling is immune to EMI, RFI, and lightning interference. As a legacy I/A Series part, stock is limited and typically available as Used or New Surplus.
- FCM2F2 RH914YZ
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No LED activity on FCM | Power failure or baseboard fault | ❌ Low | Measure 24V DC at baseboard power terminals with multimeter | Check baseboard power supply and fuses before replacing FCM |
| LED1 (Network) off or flashing erratically | Fiber optic link fault or cable break | ✅ High | Check fiber optic cable continuity; inspect ST connectors for damage/cleanliness | Replace damaged fiber cable; clean connectors; verify multimode fiber type |
| LED2 (Link) off | Fiber link not established | ✅ High | Verify fiber cable is properly terminated with ST connectors; check for proper insertion | Re-seat fiber cable; check for bent fibers; verify both ends are connected |
| FCM not communicating with FBM | FBM configuration error or address mismatch | ✅ Medium | Check FBM address/settings in I/A Series software; verify FCM-FBM pairing | Match FBM address to software configuration; verify redundant pair setup |
| Communication timeout on fieldbus | Network congestion or cable distance exceed | ✅ Medium | Measure fiber cable length; check for excess cable segments (max 3 segments, 4 baseboards) | Ensure total cable distance ≤ 20 km; max 2 km between baseboards for FCM2F2 |
| FCM LED status unclear (all off) | FCM hardware fault or baseboard power issue | ✅ High | Check baseboard power; try hot-swapping FCM to another baseboard slot | If FCM still shows no LEDs, module likely needs replacement |
| Redundant pair not syncing | Pair mismatch or fiber segment fault | ✅ High | Verify both FCMs in pair are same model (FCM2F2); check fiber segment continuity | Match FCM models; replace faulty fiber segment; verify point-to-point connection |
If you’re stuck, contact technical support with photos of the LED status, fiber cable connections, FBM configuration, and diagnostic logs from I/A Series software.
Frequently Asked Questions (FAQ)
Q: Is FCM2F2 RH914YZ the same as FCM2F4 or FCM2F10?A: No. These are three different FCM models with different fiber optic distances: FCM2F2 (RH914YZ) = 2 km, FCM2F4 (RH917JA) = 4 km, FCM2F10 (RH916TQ) = 10 km. Choose based on your substrate-to-substrate distance requirement.
Q: Can I hot-swap this FCM module?A: Yes. The FCM2F2 is designed for hot-swapping — it can be inserted or removed from the baseboard without power failure. This is a key feature for maintenance in live systems.
Q: Do I need redundant FCM pairs or can I use single FCM?A: For redundant configurations, you need one pair of FCMs per baseboard (4 FCMs total for 2 baseboards). For non-redundant configurations, only one FCM per baseboard is required.
Q: What fiber optic cable do I need for FCM2F2?A: FCM2F2 requires multimode, graded-index glass fiber with 62.5μm core, 125μm cladding, 0.275 NA, terminated with ST-type connectors. Max signal loss is 1 dB/km at 1300 nm and 3.6 dB/km at 850 nm.paresource.
Q: Is this part new or refurbished?A: Current listings show this as Used / New Surplus. New surplus is brand new equipment never used (from excess materials or leftover project stock), while used units are tested and functional.
Q: Why is this part harder to find than newer Schneider Electric modules?A: Foxboro I/A Series is a legacy system discontinued by Schneider Electric. Stock exists only as leftover surplus inventory from automation distributors, which is why availability is limited.
Q: Do I need to match FCM model for redundant pairs?A: Yes. Both FCMs in a redundant pair must be the same model (FCM2F2). Mismatched FCMs won’t sync properly.
Q: What’s the maximum fiber distance for a full FCM2F2 network?A: Max distance between any two base stations is 2 km (using FCM2F2). Total fiber optic cabling distance (all segments) between base stations cannot exceed 20 km, with up to 3 fiber segments connecting 4 baseboards maximum.
Q: Is stock guaranteed?A: No. This is an obsolete I/A Series FCM with limited stock. Availability can change quickly. Confirm current availability with the distributor before committing to a maintenance plan.
Keep these checks in mind and you’ll save yourself 90% of typical rework time.
