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Description
Technical Specifications
| Parameter Name | Value |
|---|---|
| Product Model | 1746-IB16 |
| Manufacturer | Allen-Bradley (Rockwell Automation) |
| Product Type | Digital DC Sinking Input Module |
| Product Line | SLC 500 |
| Number of Inputs | 16 |
| Input Voltage Range | 10-30V DC |
| Nominal Input Voltage | 24V DC |
| Nominal Input Current | 8 mA @ 24V DC |
| Signal Delay (ON/OFF) | 8 ms maximum |
| OFF-State Voltage (Maximum) | 5.0V DC |
| OFF-State Current (Maximum) | 1 mA |
| Backplane Current Draw (5V DC) | 85 mA (0.085 A) -1-2 |
| Thermal Dissipation per Channel | 0.20 W |
| Total Module Heat Dissipation | 3.6 W |
| Points Per Common | 16 |
| I/O Connection | 1746-HT and 1746-HCA -1 |
| Operating Temperature | 0°C to +60°C (32°F to 140°F) -10-12 |
| Storage Temperature | -40°C to +85°C (-40°F to 185°F) |
| Relative Humidity | 5-95% (Non-condensing) |
| Operational Shock | 30G |
| Operational Vibration | 2.5G at 57-200 Hz |
| Certifications | UL, CSA, CE, C-UL Class I Division 2 -1-12 |
| Weight | 0.28 kg (0.63 lbs) |
Main Features and Advantages
High-Density 16-Channel Input Configuration: The Allen-Bradley 1746-IB16 offers sixteen sinking input channels in a single-slot module, providing medium-density I/O capability that optimizes chassis utilization for applications with numerous discrete input devices -1-8. This high channel count allows system designers to maximize the number of input points per chassis slot, reducing the total number of modules and chassis slots required for large-scale control systems. The 1746-IB16 is particularly valuable in applications where multiple limit switches, pushbuttons, and proximity sensors must be monitored within a compact control architecture.
Sinking Input Architecture with Wide Voltage Tolerance: The 1746-IB16 employs a sinking input configuration, meaning the module receives current from sourcing field devices into its common terminal circuit -2-9. This architecture supports a broad operating voltage range of 10-30V DC, providing exceptional flexibility when interfacing with field devices operating at varying voltage levels. The Allen-Bradley 1746-IB16 maintains reliable ON-state detection with a nominal current of 8 mA at 24V DC, while the OFF-state maximum current of 1 mA ensures clear distinction between active and inactive input states -1-12.
Fast and Consistent Signal Response: With a maximum signal delay of 8 ms for both ON and OFF transitions, the 1746-IB16 delivers predictable and repeatable response times essential for maintaining consistent control loop performance -2-4. This deterministic response characteristic enables reliable capturing of momentary contact closures and rapid device state changes, supporting applications such as high-speed assembly operations and conveyor control where timing precision is critical.
Robust Industrial Design and Certification: The Allen-Bradley 1746-IB16 is built to withstand harsh industrial environments, featuring an operating temperature range of 0°C to 60°C and resistance to 30G shock and 2.5G vibration at 57-200 Hz -10-12. The module carries UL, CSA, and CE certifications, with C-UL Class I Division 2 hazardous location rating for deployment in potentially explosive atmospheres -1-12. Electro-optical isolation rated at 1500V between input terminals and control logic provides superior noise immunity, ensuring reliable operation in electrically noisy environments such as motor control centers and welding areas.
Removable Terminal Block for Easy Maintenance: The 1746-IB16 features a removable terminal block (1746-HT/1746-HCA) that significantly simplifies field wiring and module replacement procedures -1-12. This design allows maintenance personnel to disconnect field wiring by removing the terminal block while leaving the module in place, or quickly replace a faulty module without rewiring, reducing mean time to repair (MTTR) and minimizing production downtime.
