Product Overview
The Allen-Bradley 1746-IC16 is a digital DC input module from the SLC 500 series, engineered for reliable signal acquisition in industrial control systems. This 16-channel sinking input module accepts a voltage range of 30-55 Volts DC, making it well-suited for 48V general-purpose applications. Built to perform in demanding environments, the 1746-IC16 is approved for non-hazardous locations as well as hazardous areas rated Class 1, Division 2, Groups A, B, C, or D.
Key Technical Specifications
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Manufacturer: Rockwell Automation
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Brand: Allen-Bradley
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Part Number: 1746-IC16
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Series: SLC 500
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Module Type: Digital DC Input Module
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Voltage Range: 30-55 Volts DC Sink
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Number of Inputs: 16
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Backplane Current (5V DC): 85 mA
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Signal Delay: 4 milliseconds
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Off State Current: 1.5 milliamps
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Applications: General Purpose 48V DC Inputs
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I/O Connection: 1746-HT and 1746-HCA
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Step Response: 100 ms in, 2.5 ms out
Detailed Performance Data
The 1746-IC16 delivers a temperature-dependent voltage range of 30-60V DC sinking at 55°C and 30-55V DC sinking at 60°C. Its backplane draws 0.085A at 5V DC and 0A at 24V DC. The input signal delay is a maximum of 4ms for both ON and OFF states. The module features an OFF-state voltage loss of 10V DC and a current leakage of 1.5mA. Nominal current per input is 4.1mA at a module voltage of 48V DC. Isolation between backplane and inputs is rated at 1500V AC for 60 seconds, with a dielectric withstand of 1500V AC.
Operating temperature spans 0 to 60°C (32 to 140°F) with 5-95% relative humidity. Non-operational storage temperature ranges from -40 to 85°C (-40 to 185°F). The module withstands operational shock of 30G (3 directional pulses for 11ms) and vibration of 1.0G at 5-200Hz.
Real-World Applications
In manufacturing plants, the 1746-IC16 is commonly deployed to monitor limit switches, proximity sensors, and push-button inputs in 48V DC control circuits. Its fast 4ms signal delay ensures timely response in conveyor systems and packaging machinery. For process industries, the module's hazardous location approval makes it suitable for monitoring discrete field devices in Class 1, Division 2 areas, such as sensor inputs in chemical processing units. The module's 16 inputs allow efficient consolidation of multiple signals into one SLC 500 rack, reducing wiring complexity and panel space.
Installation & Setup Guidance
Mount the 1746-IC16 into any SLC 500 chassis slot. Ensure the backplane connector aligns properly and the locking tab secures the module. For wiring, use compatible I/O connection cables (1746-HT or 1746-HCA). Connect sinking DC inputs to the module's terminal block, observing correct polarity. Verify the input voltage stays within 30-55V DC to avoid damage. After installation, perform a continuity test on each input channel to confirm proper signal detection.
Maintenance & Reliability
Regularly inspect the module's terminal connections for tightness and signs of corrosion. Keep the module free of dust and moisture, as specified relative humidity is 5-95%. Periodically verify input signal timing using an oscilloscope to ensure the 4ms delay remains within spec. The module's robust design handles shock and vibration, but avoid mounting near high-vibration equipment without isolation. With proper care, the 1746-IC16 offers long service life, reducing downtime and replacement costs.
Compatibility & Integration
The 1746-IC16 is designed for the Allen-Bradley SLC 500 programmable controller platform. It fits any SLC 500 chassis and communicates with the CPU via the backplane. No external power supply is needed beyond the 5V DC backplane current. For wiring, use the 1746-HT or 1746-HCA I/O connection cables. This module is compatible with all SLC 500 processors, including 5/01, 5/02, 5/03, 5/04, and 5/05.
Buying Guide & Selection Advice
Before purchasing, confirm your system's voltage requirements and input count. The 1746-IC16 is ideal for 48V DC sinking inputs; if you need sourcing inputs or different voltage ranges, consider other SLC 500 modules. Verify the backplane current capacity of your chassis to ensure it can supply 85 mA at 5V DC. Check the I/O connection cables availability; 1746-HT and 1746-HCA are required. PLC Source PRO offers genuine Allen-Bradley 1746-IC16 modules with fast shipping and reliable support, ensuring your automation project stays on schedule.