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Key Technical Specifications
| Parameter | Value / Specification |
| Manufacturer | Foxboro / Invensys (Schneider Electric) |
| Part Number | RH916XZ |
| Module Type | Fieldbus Processor / Communication Interface |
| Input Voltage | 24 V DC (via backplane bus) |
| Power Consumption | 7.5 W maximum |
| Communication Protocol | Foxboro HDLC / Fieldbus Communication Protocol |
| Interface Ports | Redundant A/B Fieldbus Connections |
| Operating Temperature | 0 to 60°C (32 to 140°F) |
| Storage Temperature | −40 to +85°C (−40 to +185°F) |
| Relative Humidity | 5% to 95% non-condensing |
| Galvanic Isolation | 500 V DC field-to-bus isolation |
| System Compatibility | Foxboro I/A Series Baseplates & Control Processors |
Product Introduction & Supply Chain Strategy
The Foxboro RH916XZ is a dedicated fieldbus communication processor designed for Foxboro I/A Series Distributed Control Systems (DCS). It coordinates real-time deterministic communication between field I/O modules and main control processors, ensuring low-latency data throughput across critical processing loops.
Sourcing the RH916XZ as New Surplus protects process networks from communication degradation caused by aging logic circuits. Refurbished communication modules frequently suffer from intermittent signal timing issues and backplane pin oxidation, leading to packet drops and false node failovers. Securing verified original stock eliminates these risks while extending the operating life of legacy control infrastructure.
RH916XZ
RH916XZ
Installation & Configuration Guide
1.Pre-Installation (Prep & Safety):Document node addressing and wear grounding protection.
Isolate primary power to the target slot following standard lock-out/tag-out (LOTO) protocols. Put on an ESD wrist strap grounded to the cabinet frame. Photograph all DIP switches and jumper configurations on the existing module to ensure exact replication on the replacement unit.
2.Removal of Legacy Hardware:Extract failed module without bending connector pins.
Disengage the module retaining screws located on the top and bottom of the housing. Pull the module release lever or edge handles evenly to slide the card straight out of the baseplate guide slots, avoiding side-to-side force that can damage backplane connections.
3.Installation & DIP Switch Alignment:Match hardware addresses and insert card.
Set the DIP switches and address jumpers on the new RH916XZ to match the original unit precisely. Align the module card edges with the baseplate tracks and push the module firmly into the slot until the backplane connectors seat completely. Tighten retaining screws to 0.6 Nm (5.3 in-lbs).
4.Power-On & Network Initialization:Verify fieldbus link indicators and CPU synchronization.
Restore 24 V DC backplane power. Observe the front panel status LEDs: the power LED must show solid green, while communication LEDs (A/B) should flash rapidly during network polling. Verify through the system configurator that the node status reports ONLINE without parity or CRC errors.
Firmware/Software Versions & Upgrade Notes
- Base Firmware: System Release 7.x / 8.x compatible hardware build.
- Compatibility: Integrates with Foxboro I/A Series Control Processors (CP40, CP60, FCP270) and associated Fieldbus Expansion Modules.
- Firmware Mismatch Warning: Upgrading or replacing communication hardware without matching firmware levels can cause protocol handshake timeouts or prevent redundant module pairs from synchronizing. Always record existing node firmware revisions prior to swapping modules.
Frequently Asked Questions (FAQ)
Is this Foxboro RH916XZ module guaranteed to be New Surplus?
Yes. We strictly supply New Surplus / Original New parts. This unit has never been installed or commissioned in an industrial facility, guaranteeing pristine circuit traces and maximum operating life.
Why should I avoid purchasing a refurbished RH916XZ for my DCS?
Refurbished communication cards often carry hidden thermal fatigue on processing chips and degraded timing crystals. A microscopic timing drift on a refurbished card can cause bus arbitration failures, triggering emergency plant shutdowns that cost significantly more than the price difference of a New Surplus part.
Can I hot-swap the in a running rack?
If the module is configured in a fault-tolerant dual-redundant pair on a supported baseplate, you can swap a single module without shutting down the loop. However, always confirm that the healthy partner module has taken full control of the fieldbus before extracting the faulty unit.
Do I need to reload software onto the module after physical replacement?
No onboard program software needs to be manually flashed. System node parameters and address mappings are determined by hardware DIP switch settings and configurations pushed directly from the host Control Processor upon boot.
What documentation accompanies this module?
Every unit includes OEM serial number verification, anti-static protective packaging, and a final QC inspection certificate validating electrical continuity and pin integrity.
What is the warranty coverage for this part?
We back this New Surplus module with a full 1-year replacement warranty covering all operational and hardware functions under normal operating conditions.
