Allen-Bradley 1746-IC16 SLC 500 Digital DC Input Module

Technical Specifications Breakdown

Key parameters for the 1746-IC16 are listed below for quick reference:

Competitive Comparison: Why the 1746-IC16 Stands Out for 48V DC Applications

When selecting a digital input module for 48V DC sinking applications, the Allen-Bradley 1746-IC16 offers a reliable, field-proven solution within the SLC 500 series. Its robust design and precise electrical characteristics reduce the risk of false triggering and signal degradation, ensuring consistent performance in demanding conditions.

Industry Applications

Its 16 sinking inputs allow for direct connection to proximity sensors, limit switches, and pushbuttons without external interface relays. The 4ms signal delay ensures fast response for high-speed counting or position monitoring, reducing downtime in production processes.

Installation & Setup Guidance

Mount the module into any SLC 500 chassis slot, ensuring proper backplane connection. Use the specified I/O connections (1746-HT or 1746-HCA) for field wiring. Verify that the input voltage is within the 30-55V DC sink range and that the off-state current does not exceed 1.5 mA to avoid false ON signals. The step response of 100 ms in and 2.5 ms out should be considered when designing time-critical control loops.

Maintenance & Reliability

Periodically inspect the module for dust accumulation and ensure the operating temperature stays between 0 and 60 °C. The unit is approved for non-hazardous and Class 1, Division 2 hazardous locations, so verify the environment meets these ratings. No routine calibration is required; however, check the backplane current draw (85 mA at 5V DC) during system diagnostics to confirm proper power supply loading.

Compatibility & Integration

It supports both 1746-HT and 1746-HCA connection cables for field wiring. The module is not designed for analog or specialty I/O; it is strictly a digital DC input module for 48V sinking signals.

Selection Guide & Purchasing Advice

When evaluating this module for your system, confirm that your application requires 48V DC sinking inputs and that the 16-point density matches your I/O count. For replacement or new installations, the 1746-IC16 remains a cost-effective choice for maintaining legacy SLC 500 systems. AutoDCSTech stocks this module and can advise on lifecycle status and availability. Please verify current lifecycle status and availability with AutoDCSTech before ordering.

Troubleshooting & Common Issues

If inputs fail to register, first check the field wiring voltage against the 30-55V DC sink range. An off-state current above 1.5 mA may indicate leakage from a connected sensor, causing false ON signals. Verify that the backplane current draw is 85 mA at 5V DC; deviations could point to a faulty module or power supply. For persistent issues, inspect the I/O connection cables (1746-HT or 1746-HCA) for damage.