Foxboro RH916ND Base Station-to-Base Station Cable

Applications

The Foxboro RH916ND base station interconnect cable is an original replacement component for the Foxboro I/A Series DCS platform. It is intended for cabinet-mounted installation to create a dedicated 2 Mbps fieldbus link between adjacent baseplates or redundant base station assemblies. It is deployed in continuous process control facilities including chemical manufacturing, fossil-fuel power plants, hydrocarbon refining, pulp and paper mills, and water treatment DCS panels. Typical use cases include base station spare replacement, rack reconfiguration, and DCS system maintenance shutdowns where the factory-specified base-to-base communication path must be restored.

Advantages

RH916ND is a direct updated revision superseding older P0916ND variants, retaining the factory-calibrated impedance and timing characteristics required for I/A Series base station fieldbus communication. Its fully shielded multi-conductor construction suppresses EMI interference originating from nearby variable frequency drives and high-current power circuits. Factory-terminated connectors preserve the defined pinout, eliminating wiring errors that arise from field-built cables. Every unit undergoes continuity and signal integrity validation before shipment, ensuring interoperability with I/A Series base station hardware. This short fixed-length cable fits compact rack layouts and removes the risk of custom field cabling failing to meet the DCS timing requirements.

Technical FAQs

1. Q: What communication rate does the RH916ND cable support for base station interconnection? A: It supports the I/A Series native 2 Mbps fieldbus communication for baseplate to baseplate interconnection.
2. Q: Is RH916ND backward-compatible with legacy I/A Series hardware originally using P0916ND? A: Yes, RH-series cable variants serve as the modern replacement for older P0916ND, with matching electrical and connector specifications for direct drop-in replacement.
3. Q: Can multiple RH916ND cables be cascaded to extend the distance between two base stations? A: Cascading is not permitted. The 2 Mbps fieldbus has strict timing and impedance constraints; chaining cables will degrade signal integrity and trigger intermittent communication faults.
4. Q: Can this cable be used to connect FBM field modules to field instruments? A: No, it is exclusively designed for base station/baseplate internal fieldbus links, not analog or discrete field I/O instrument wiring.
5. Q: What installation environment is approved for RH916ND? A: It is rated for installation inside sealed indoor control cabinets. It is not approved for outdoor, wet, or hazardous classified field locations.
6. Q: What risk exists if this cable is routed parallel with high-current AC power cables? A: Parallel routing alongside high power conductors introduces electromagnetic noise, disturbs fieldbus synchronization and can cause unstable base station communication.
7. Q: Can on-site technicians re-crimp or replace damaged cable connectors locally? A: Field re-termination is not approved. Factory-terminated connectors are part of the qualified assembly; on-site modification changes electrical parameters and invalidates factory conformance.
8. Q: What system alert is generated when the RH916ND communication link fails? A: The I/A Series HMI will log base station fieldbus link diagnostic alarms to notify operators of loss of inter-baseplate communication.
9. Q: Can RH916ND be interchanged with other RH916xx series cables of different lengths? A: No. RH916 series cables have different physical lengths and electrical matching; cross substitution violates Foxboro system design specifications.
10. Q: Does this cable carry DC power between connected base station hardware? A: No. It transmits only 2 Mbps fieldbus data and synchronization signals; it does not carry power supply circuits between base stations.