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Allen-Bradley 1771-IVN/C Input Module

1. Product Description

The 1771-IVN/C is a 16-channel digital input module from Allen-Bradley’s PLC-5 series, designed for industrial automation applications. It supports 120V AC inputs and provides reliable signal acquisition for PLC control systems. The module features optical isolation and LED status indicators for real-time diagnostics, making it suitable for harsh industrial environments .

2. Key Features

16-Channel AC Input – Supports 120V AC signals, compatible with industrial switches and sensors .
Optical Isolation – 250V AC continuous isolation between field wiring and backplane, ensuring noise immunity .
LED Status Indicators – Includes 16 red LEDs (one per channel) and a green module active indicator for quick troubleshooting .
Adjustable Input Delay – Configurable 5ms or 20ms delay jumper to prevent false signal detection .
Hot-Swappable (RIUP) – Can be replaced without powering down the system (when used with compatible chassis) .
Wide Compatibility – Works with PLC-5 controllers but not compatible with 1771-A1, A2, or A4 chassis .

3. Technical Specifications

Parameter	Specification
Input Type	16 digital (120V AC)
Input Current	9.9 mA @ 120V AC (60Hz) / 8.7 mA @ 120V AC (50Hz)
Isolation Voltage	250V AC (channel-to-backplane)
Power Consumption	8.8W (max) / 1.0W (min)
Operating Temp.	0°C to 60°C
Certifications	CE, UL, CSA

4. Applications

Manufacturing Automation – Machine control, safety interlocks .
Energy & Power Systems – Substation monitoring, relay status detection .
Water Treatment – Pump and valve control in process automation .

5. Installation & Precautions

Wiring Compliance – Use shielded cables in high-noise environments .
Chassis Compatibility – Ensure proper alignment with PLC-5-compatible racks (excludes 1771-A1/A2/A4) .
Power Requirements – The module draws 195 mA from the backplane; verify total chassis power capacity before installation