Allen-Bradley 1771-IG Overview The Allen-Bradley 1771-IG is an 8-point isolated digital input module designed for use in PLC-5 systems with the 1771 I/O chassis. It accepts 24V DC sinking (current sourcing) inputs, offering isolation per point, which ensures electrical separation between field devices and backplane circuitry. This module is ideal for industrial applications requiring precise and reliable digital signal monitoring. Key Features Input Points: 8 isolated inputs Voltage Rating: 24V DC nominal Input Type: Sinking (accepts sourcing input devices) Isolation: Point-to-point and from backplane Chassis Compatibility: Allen-Bradley 1771 Mounting: Chassis-based module Field Wiring: Removable terminal block (RTB) required LED Indicators: Status for each input channel Technical Specifications Catalog Number: 1771-IG Input Voltage Range: 15–30V DC Nominal Voltage: 24V DC Current per Input: Typically 8 mA Signal Delay (on/off): ~10 ms Backplane Current Draw: Approx. 120 mA at 5V DC Operating Temperature: 0°C to 60°C Certifications: UL, CSA, CE Compatible PLCs: PLC-5 series processors with 1771 chassis Applications Machine status monitoring Switch and push-button interfaces Industrial signal acquisition Discrete input integration for PLC-5 systems Systems requiring isolated DC digital inputs Why Choose the 1771-IG Electrical Isolation: Prevents cross-channel interference Compact Design: Fits standard 1771 chassis Reliable Performance: Designed for harsh industrial conditions Direct Integration: Seamless with legacy PLC-5 control systems Clear Diagnostics: LED indicators for easy troubleshooting Order Now The Allen-Bradley 1771-IG digital input module is available and ships worldwide.
