P0931RM Foxboro I/A Series Redundant System Termination Cable

Product Overview

The P0931RM (P0931RM) is a high-integrity Type 1 Termination Cable specifically engineered for the Foxboro I/A Series FBM216b HART® Communication Redundant Input Subsystem. This cable provides the critical physical link between the FBM216b Redundant Adapter (P0924DT) and the Compression-type Termination Assembly (P0924JH). Designed for high-availability environments such as oil refineries, power utility plants, and chemical processing, the P0931RM ensures that individually isolated HART input signals are transmitted without loss or interference. By utilizing premium Polyurethane materials, this cable maintains system uptime in mission-critical loops where signal failure is not an option.

Technical Configuration

As a Type 1 system cable, the P0931RM is defined by its specific electrical properties and physical construction tailored for redundant HART signal processing:

• Redundancy Architecture: The cable connects to the Redundant Adapter, which combines signals from two adjacent FBM216b modules (Master and Tracker) into a single 25-pin output to the field.

   

• Physical Interface: It features a 37-pin D-subminiature connector at the FBM Baseplate end and a 25-pin D-subminiature connector at the Termination Assembly end.

   

• Material Composition: Constructed with a Polyurethane outer jacket and semi-rigid PVC primary conductor insulation, providing superior durability against industrial wear.

   

• Standardized Length: This specific model (P0931RM) is the designated part number for the 2.0 meter (6.6 feet) version within the Type 1 cable family.

Technical Specifications

Technical FAQs

Can the P0931RM cable be used with non-redundant FBMs?No, the P0931RM is a Type 1 cable specifically validated for use with the FBM216b redundant adapter configuration. For non-redundant 100 Series or 200 Series modules, different cable types are required to match the pin-out of standard baseplates.

What is the difference between P0931RM and the LSZH version?The P0931RM uses Polyurethane (P/PVC) with a temperature limit of +80 deg C. The LSZH version (P0928AC) is "Low Smoke Zero Halogen," designed for safety-critical areas where toxic smoke must be avoided during a fire, and supports up to +105 deg C.

Does this cable support HART digital communication?Yes. The cable is designed to carry the 4 to 20 mA analog signal with the digital HART FSK signal superimposed, maintaining the integrity of bi-directional digital communications with field devices.

Engineering & Installation Guide

• Strain Relief: When connecting the 37-pin D-sub end to the redundant adapter, ensure the mounting lugs are tightened to prevent vibration-induced signal intermittent.

• Bending Radius: Maintain a minimum bending radius of at least 10 times the cable diameter. Avoid sharp 90-degree bends near the connectors to prevent internal conductor fatigue.

• Routing: Although the Polyurethane jacket is rugged, keep the P0931RM separate from high-voltage AC power lines within the cabinet to minimize EMI (Electromagnetic Interference) on the 4-20mA HART loops.

Engineering Advantages

The P0931RM is part of a UL/UL-C listed and ATEX Zone 2 certified subsystem. Its construction is suitable for Class G3 (Harsh) environments, providing 15-bit resolution accuracy for HART signals even in corrosive or high-humidity atmospheres. The use of standard D-sub connectors allows for rapid "Plug-and-Play" replacement, which is critical for maintaining the high availability of the FBM216b redundancy pair.