FBMХХ RH931RQ Termination Cable, Type 4

RH931RQ is not a control module (such as FCP or FBM), but rather a system connection accessory specifically designed to provide terminal cables for FBM200 series modules.

Therefore, its function is not to execute control or process I/O signals, but to ensure the reliability of data transmission and physical connections between the core components of the control system and field wiring terminals.

1. 📜 (What is RH931RQ?)

RH931RQ is a cable part number within the Foxboro I/A Series (Intelligent Automation Series) system.

Type: FBM2xx Series Type 4 Termination Cable.

Purpose: Connects module connectors of FBM200 series I/O modules (e.g., FBM202, FBM203) to field wiring termination assemblies (Termination Assembly, TA).

Physical Characteristics: Typically a multi-core shielded cable, approximately 2 meters in length, ensuring signal integrity and interference resistance. The model number RH931RQ is a specific component part number (Part Number).

2. ⚙️ Primary Function

The core function of RH931RQ is to serve as the critical bridge between control modules and field wiring, enabling secure and reliable signal connection.

A. Signal Connection and Transmission
Connecting I/O Modules: Links the signal connectors on FBM2xx modules to remote or local field wiring terminals (Termination Assembly).

Data Pathway: Provides the physical pathway for FBM modules to communicate and exchange data with field devices (e.g., sensors, transmitters, valves).

Signal Integrity: As a shielded cable, it protects low-voltage I/O signals from electromagnetic interference (EMI) and radio frequency interference (RFI), ensuring the accuracy of signals collected from or transmitted to the field.

B. System Installation and Maintenance
Simplified Field Wiring: The cable enables plug-and-play replacement of FBM modules without reconnecting hundreds of field signal wires, significantly streamlining system installation and maintenance.

Standardized Interfaces: Ensures consistent and interchangeable connections between FBM modules and various terminal assemblies (e.g., screw-type, spring-type, relay-type).

Physical Connections: Ensures secure locking and reliable contact of cable connectors, withstanding vibration and temperature variations in industrial environments.

C. Meaning of FBMxx

Although RH931RQ is a cable, it serves FBM modules. FBM (Fieldbus Module) refers to the family of modules within Foxboro I/A Series systems that connect field I/O signals, such as:

FBM201/202/203/204: Analog input/output.

FBM207/208: Digital input/output.

The core function of FBM is to acquire, isolate, and convert electrical signals from the field into digital information recognizable by the control processor (FCP), and vice versa.