1. Product Detailed Description
The FBM230 is a simplex (single) communication module that provides four independent serial ports. Its primary function is to collect data from field devices, perform necessary protocol conversions, and integrate that data into the Foxboro control database as standard Distributed Control Interface (DCI) blocks.
Unlike standard I/O modules that handle raw electrical signals, the FBM230 is a "smart" integrator. It uses downloadable software drivers to speak the specific "language" (protocol) of the field device, such as Modbus RTU or ASCII.
2. Product Parameters (Specifications)
| Parameter | Specification |
| Part Number | P0926GU (Model: FBM230) |
| Communication Ports | 4 Isolated Serial Ports |
| Serial Standards | RS-232, RS-422, or RS-485 (Software Configurable) |
| Device Capacity | Up to 64 RS-485 devices; Up to 4 RS-232/422 devices |
| Data Connections | Up to 2,000 DCI block connections |
| Power Requirements | 24 V DC (nominal); Consumption: 7 W (max) |
| Module Fieldbus | Redundant 2 Mbps Fieldbus |
| Operating Temp | -20°C to +70°C (-4°F to +158°F) |
| Environmental | Class G3 Harsh Environment (ISA Standard S71.04) |
| Dimensions | 102 mm x 45 mm x 104 mm |
3. Product Advantages
Protocol Flexibility: Each of the four ports can be individually configured for different serial standards, allowing you to mix RS-232 and RS-485 devices on a single module.
Ease of Integration: Field data is mapped directly into standard Foxboro control blocks (RIN, ROUT, BIN, etc.), making third-party data look like native system data to operators.
High Reliability: Features channel-to-channel isolation and a rugged extruded aluminum exterior, protecting the circuitry from electrical noise and physical damage.
Downloadable Drivers: Supports a library of protocol drivers, ensuring compatibility with a wide range of industrial equipment without hardware changes.
4. Cautions & Precautions
Driver Loading: Before the module can communicate, the correct I/O software driver must be downloaded from the Foxboro library. Ensure the driver version matches your field device firmware.
Termination Assemblies: The FBM230 requires a specific Termination Assembly (TA) for physical wiring. Using the wrong TA can lead to signal loss or port damage.
Distance Limits: While RS-485 can reach up to 1200m, RS-232 is limited to approximately 15m. Use high-quality shielded twisted-pair cables for long runs to avoid EMI.
Hot-Swapping: While FBMs are generally hot-swappable, always ensure the system configuration allows for the removal of a simplex module without interrupting critical control loops.
5. Product Applications
The FBM230 is typically used to integrate "islands of automation" into the main plant control system:
Power & Energy: Interfacing with Protection Relays or Power Meters (Modbus).
Water/Wastewater: Communicating with remote PLC-controlled pump stations.
Oil & Gas: Integrating flow computers, tank gauging systems, or gas chromatographs.
Factory Automation: Connecting Variable Frequency Drives (VFDs) and specialized weighing systems to the DCS.
