Description
- Model Number: FBM231 (Part Number: P0926GH)
- Series: Foxboro I/A Series / EcoStruxure Foxboro DCS
- Input Type: 4 Isolated Analog Input Channels (0 to 20 mA DC)
- Precision: 15-bit A/D Conversion
- Input Impedance: 250 Ohms (Nominal)
- Communication: High-speed redundant Fieldbus interface
- Mounting: High-Density (HD) Baseplate mounted
- Regulatory Compliance: Class 1, Division 2 (Hazardous Locations)
- Weight: 0.62 lbs (0.28 kg)
- Dimensions: 4.02 in x 1.77 in x 4.49 in (102 mm x 45 mm x 114 mm)
FOXBORO P0926GH
FOXBORO P0926GH
FOXBORO P0926GH
The FOXBORO P0926GH (FBM231) is a specialized 4-channel analog input module designed for the I/A Series system to interface with current-loop field sensors. Unlike general-purpose modules, the FBM231 provides high-level galvanic isolation for each individual channel, ensuring that ground loops or electrical interference on one sensor line do not affect the other three or the main control processor. The P0926GH variant is the “High Density” version, engineered to fit into modern compact baseplates while maintaining the rugged environmental specifications required for heavy industrial applications like oil and gas or chemical processing.
Model Comparison
The P0926GH (FBM231) is often compared to the P0926GU (FBM230); while they share the same physical form factor, the P0926GH is strictly for 0-20mA analog inputs, whereas the P0926GU is a serial communication module (RS-232/422/485). Compared to the P0926AE, the P0926GH is the updated RoHS-compliant hardware revision, offering improved power efficiency and better thermal stability. It is specifically designed for “S-Series” high-density hardware, making it smaller and more vibration-resistant than the legacy 100-series FBMs used in older Foxboro installations.
Operation Tips
- Loop Powering: Determine if your field transmitters are “Active” (self-powered) or “Passive” (loop-powered). If passive, ensure the baseplate is wired to provide the necessary 24V DC excitation to the loop.
- Channel Isolation: Take advantage of the per-channel isolation by connecting sensors from different power sources without worrying about common-mode voltage issues.
- Baseplate Compatibility: Ensure the P0926GH is plugged into a “High Density” (HD) baseplate; it will not physically fit into the older, wider legacy baseplate slots.
- Hot-Swapping: This module supports hot-swapping. When replacing a unit, the I/A Series software will automatically download the existing configuration to the new P0926GH, provided the hardware letter revision is compatible with the system’s software image
