Model Foxboro FBM237 Module Type Analog Input (AI) Number of Channels 8 independently configurable input channels. Input Types (Configurable) • 4-20 mA DC (current loop) • 0-10 V DC (voltage) • 1-5 V DC (voltage) • Thermocouple (T/C) types (e.g., J, K, T, E, R, S, B, N) • RTD (e.g., 100 Ohm Pt, 10 Ohm Cu) • Millivolt (mV) signals Resolution 16-bit (high resolution for precise measurement). Accuracy ±0.05% of reading for voltage/current inputs. Varies for T/C and RTD based on type and range. System Compatibility Foxboro I/A Series DCS. Must be installed in a compatible FBM fieldbase (e.g., FBM200 series). Update Rate Configurable, typically a scan of all channels within tens of milliseconds. Input Impedance > 1 MΩ for voltage inputs. 250 Ω (or other shunted resistor) for current inputs. Power Supply Powered by the fieldbase (typically ±12V and +5V from the power supply module). Isolation Channel-to-Channel: Yes, channels are isolated from each other. Channel-to-Bus: 500 V AC optical isolation protects the system bus from field-side faults. Field Wiring Field wiring is terminated to a removable screw terminal block on the associated fieldbase. A common return terminal is provided for groups of inputs. Diagnostics Includes comprehensive internal diagnostics for faults (e.g., module failure, open input circuit, over-range, under-range). LED Indicators Module status LEDs (e.g., OK, ACTIVE, FAIL) and often per-channel status indicators for faults. Environmental Designed for industrial environments. Operating temperature typically 0 to 60°C (32 to 140°F).

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