Allen-Bradley 1771-IFMS Intrinsically Safe Fast Millivolt Input Module

Core Measurement Specifications

• Manufacturer: Rockwell Automation / Allen-Bradley
• Model Number: 1771-IFMS
• Module Type: Intrinsically Safe Fast Millivolt Input
• Input Channels: 8 Differential Channels
• Voltage Range: 0-50 Millivolts DC
• Resolution: 12-bit Binary
• Accuracy: 0.1% of Range at 25°C
• Linearity: ±1 LSB

Performance & Environmental Ratings

• The module scans all 8 channels in just 14.5 milliseconds.
• Input impedance measures 1 megaohm for minimal signal loading.
• Common-mode rejection ratio reaches 100 dB at 60 Hertz.
• Operating temperature range spans from 0 to 60 degrees Celsius.
• Relative humidity tolerance ranges from 5% to 95% non-condensing.
• The module withstands 15 G operational shock and 30 G non-operational shock.

Electrical & Safety Characteristics

• Backplane current requirement is 750 milliamperes at +5 Volts DC.
• Input overvoltage protection handles up to 32 Volts continuously.
• The A/D converter provides monotonic output with no missing codes.
• Maximum input voltage range capability extends to ±10 Volts DC.
• This intrinsically safe design meets T6 temperature code requirements.
• Non-intrinsically safe side must not exceed 250 Volts RMS.

Installation & Wiring Guidelines

• Always install the 1771-IFMS module with system power completely off.
• Use the compatible 1771-WG wiring arm for all field connections.
• Recommended wire size is 0.25–2.5 mm² (22–14 AWG) copper.
• Apply proper screw torque between 0.8–1.0 Nm (7–9 lb-in).
• Ensure wire insulation rating is 75°C (167°F) or greater.
• Follow electrostatic discharge precautions during handling.

Packaging & Global Shipping

• Your order includes one factory-sealed Allen-Bradley 1771-IFMS module.
• We provide secure packaging with static protection for safe delivery.
• We ship worldwide via express carriers including FedEx, UPS, and DHL.
• You receive full tracking details immediately after order dispatch.

Frequently Asked Questions (FAQ)

• What does "intrinsically safe" mean for this module?
• It means the module prevents ignition of flammable atmospheres by limiting electrical energy.
• What types of sensors work with this millivolt input module?
• It connects to low-level sensors like thermocouples, strain gauges, and load cells.
• How does the 12-bit resolution benefit measurement accuracy?
• This resolution provides 4096 discrete steps across the 0-50 mV range for precise readings.
• Can I hot-swap this module while the PLC-5 system is powered?
• No, the module does not support Removal and Insertion Under Power (RIUP).
• What is the significance of 100 dB common-mode rejection?
• This high rejection ratio eliminates noise interference from ground potential differences.

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