Overview

• Part Number: 1771-IR/D
• Type: Analog Input Module
• System Compatibility: Compatible with Allen-Bradley’s 1771 I/O series (typically used with PLC-5 or similar systems).
• Function: Converts analog signals from external devices (e.g., transmitters, sensors) into digital data that the PLC can process. It is particularly used in applications that require high-resolution input for precise control of industrial processes.

Specifications

• Input Types Supported:

  • 4 to 20 mA current input
  • 0 to 10 VDC voltage input
  • ±10 VDC voltage input
  • ±20 mA current input

• Resolution:

  • 12-bit resolution (i.e., 4096 discrete levels for the analog input signal)

• Input Range:

  • Voltage Input: 0 to 10 VDC (scalable range)
  • Current Input: 4-20 mA or 0-20 mA (scalable range)

• Number of Channels:

  • 8 channels of analog input (differential or single-ended input)

• Input Impedance:

  • Voltage Input: 1 MΩ (minimum)
  • Current Input: 250 Ω (for 4-20 mA input)

• Accuracy:

  • Typically ±0.5% of full-scale input, but it depends on calibration and conditions.

• Signal Conditioning:

  • Each channel can be configured for different input types (e.g., voltage or current).

• Communication Protocol:

  • The 1771-IR/D communicates via the Allen-Bradley PLC-5 backplane using standard discrete I/O addressing.

• Power Requirements:

  • Voltage: 24V DC ± 10% (from the backplane power supply)
  • Power Consumption: Approximately 2W

• Environmental Specifications:

  • Operating Temperature Range: 0°C to 60°C (32°F to 140°F)
  • Storage Temperature Range: -40°C to 85°C (-40°F to 185°F)
  • Relative Humidity: 5% to 95%, non-condensing

• Mounting:

  • Designed to mount on a standard 1771 I/O chassis.

• LED Indicators:

  • Individual LEDs for each channel (for status and diagnostics)
  • Fault indicators for the module