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Allen-Bradley 1771-IBN/C is a 24V DC high-true input module designed for PLC-5 and SLC 500 systems. Part of the 1771 I/O family, this 16-channel module provides reliable digital signal acquisition with isolated inputs and LED status indicators. Ideal for harsh industrial environments, it supports positive logic (sinking) applications in manufacturing, material handling, and process control systems.
Product Specifications
Core Specifications
Input Type: 24V DC High-True (Sinking)
Channels: 16 (isolated in groups of 8)
Input Voltage Range: 10-30V DC
On-State Current: 8mA typical (5mA min)
Off-State Voltage: <5V DC
Response Time: <1ms (ON/OFF)
Key Functional Attributes
Input Circuitry
Optical isolation (500V RMS) between field and logic
Grouped isolation (channels 0-7 and 8-15)
Surge protection (IEC 61000-4-5 compliant)
Diagnostics & Indicators
Compatibility
1771 I/O chassis (A1B, A2B, A3B, A4B)
PLC-5, SLC 5/04, SLC 5/05 processors
Direct mapping to processor data table
Mechanical/Environmental
Enclosure: NEMA 1 (IP20)
Terminations: Removable screw terminals (14 AWG max)
Operating Temp: 0°C to 60°C (32°F to 140°F)
Power Consumption: 100mA @ 5V DC (backplane)
3. Typical Applications
Machine Control: Limit switch, pushbutton monitoring
Safety Circuits: E-stop and guard door inputs
Conveyor Systems: Photoeye and proximity sensor interfacing
Process Automation: Pump/valve status feedback
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