Allen-Bradley 1771-NIS Series C High-Resolution Isolated Analog Input Module

The Allen-Bradley 1771-NIS Series C is a high-resolution isolated analog input module designed for the 1771 I/O family used with PLC-5 programmable controllers. This intelligent analog module provides eight isolated current-loop input channels with 16-bit resolution for precise acquisition of process instrumentation signals. The module supplies loop power for compatible 2-wire transmitters, making it well suited for industrial process control applications. The 1771-NIS has been discontinued by Rockwell Automation but remains in demand for maintaining legacy PLC-5 systems.

Confirmed Specifications

• Manufacturer: Allen-Bradley (Rockwell Automation)
• Catalog Number: 1771-NIS
• Series: C
• Part Number: 96288874
• Product Type: High-Resolution Isolated Analog Input Module
• PLC Platform: 1771 I/O / PLC-5
• Number of Input Channels: 8
• Input Type: Isolated Analog Current Inputs
• Input Signal Range: 0.1–21 mA
• Resolution: 16-Bit
• Isolation: Channel-to-channel isolated
• Loop Power: Built-in loop power for compatible 2-wire transmitters
• Data Format:
  • Natural Binary
  • BCD
• Backplane Current Draw: Approximately 2.9 A
• Mounting: 1771 I/O Chassis
• Country of Origin: USA
• Lifecycle Status: Discontinued by Rockwell Automation (May 31, 2017)

Typical Applications

• PLC-5 process control
• Industrial automation
• Process instrumentation
• Pressure transmitter monitoring
• Flow transmitter monitoring
• Level transmitter monitoring
• SCADA systems
• Chemical processing
• Water & wastewater treatment
• Power generation