Overview

Foxboro FBM211 RH914TN is an input module with 16 group isolated and independent channels, designed for precise signal conversion and HART® compatibility.

Functional Specifications

• Input Channels: 16 group isolated, independent channels
• Input Range (per channel): 0 to 20.4 mA DC (current limited to 33 mA)
• Accuracy: ±0.03% of span
  • Accuracy Temperature Coefficient: ±50 ppm/°C
• A/D Conversion: Sigma-Delta converter, multiplexed for each channel
• Integration Period: Software configurable
• Common Mode Rejection: >100 dB at 50 or 60 Hz
• Normal Mode Rejection: >35 dB at 50 or 60 Hz
• Input Channel Impedance: 61.9 Ω (nominal)
• Field Device Cabling Distance: Varies based on compliance voltage, wire gauge, and voltage drop
• Loop Power Supply Protection: Current limited and voltage regulated with a maximum short circuit current of 35 mA
• HART® Protocol Compatibility: Compatible with HART High Impedance Device for use in HART loops (with a 200-ohm resistor for FoxCom/HART transmitters)

Power Requirements

• Input Voltage Range (Redundant): 24 V DC ±5%, -10%
• Consumption:
  • 7 W (maximum) at 24 V DC
  • 11 W (maximum) at 24 V DC with all inputs at 20.4 mA (internal power)
• Heat Dissipation: 3 W (maximum) at 24 V DC

Environmental Specifications

• Operating Temperature:
  • Module: -20 to +70°C (-4 to +158°F)
  • Termination Assembly - PVC: -20 to +50°C (-4 to +122°F)
  • Termination Assembly - PA: -20 to +70°C (-4 to +158°F)
• Storage Temperature: -40 to +70°C (-40 to +158°F)
• Relative Humidity: 5 to 95% (non-condensing)
• Altitude:
  • Operating: -300 to +3000 m (-1000 to +10,000 ft)
  • Storage: -300 to +12,000 m (-1000 to +40,000 ft)
• Contamination: Suitable for Class G3 (Harsh) environments
• Vibration: 0.75 m/s² (5 to 500 Hz)

Physical Specifications

• Mounting:
  • Module: Mounts on a modular baseplate, can be mounted on DIN rail (horizontally or vertically) or 19-inch rack
  • Termination Assembly: Mounts on DIN rail, accommodates multiple DIN rail styles (32 mm or 35 mm)
• Weight:
  • Module: 284 g (10 oz)
  • Termination Assembly (Compression): 272 g (0.60 lb)
• Dimensions (Module):
  • Height: 102 mm (4 in), 114 mm (4.5 in with mounting lugs)
  • Width: 45 mm (1.75 in)
  • Depth: 104 mm (4.09 in)

Part Numbers

• FBM211 Module: RH914TN

Termination Cables

• Cable Lengths: Up to 30 m (98 ft)
• Cable Materials: Polyurethane or Low Smoke Zero Halogen (LSZH)
• Termination Cable Type: Type 4
• Cable Connection: 37-pin male D-subminiature

Construction

• Material (Termination Assembly): Polyamide (PA), compression
• Terminal Blocks: 2 tiers, 16 positions