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Description
The Allen-Bradley 1746-IB16 is a high-density discrete input module engineered for the SLC 500 programmable controller platform. It provides sixteen (16) current-sinking input channels, operating at a nominal 24V DC. This module is designed to interface a wide range of field devices, including proximity sensors, limit switches, and photoelectric sensors, into a single-slot footprint within an SLC 500 chassis.
Features
- Sixteen (16) current-sinking input channels for high-density I/O configurations.
- Nominal operating voltage of 24V DC with an operating range of 10–30V DC.
- Low power consumption, drawing only 50 mA from the 5V DC backplane.
- Integrated input filtering with an 8 ms signal delay for both ON and OFF transitions to mitigate electrical noise and contact bounce.
- Includes a removable terminal block for simplified wiring and maintenance.
Applications
The 1746-IB16 is widely used in industrial automation environments requiring high-density digital input monitoring. Typical applications include machine control, process monitoring, and assembly line automation where multiple DC-powered sensors must be integrated into a single SLC 500 rack.
Technical Specifications
| Brand |
Allen-Bradley |
| Product Line |
SLC 500 |
| Module Type |
Digital DC Input Module |
| Number of Inputs |
16 (Current Sinking) |
| Voltage Category |
24V DC |
| Operating Voltage Range |
10–30V DC |
| Signal Delay (ON/OFF) |
8 ms |
| Backplane Current (5V DC) |
0.05 A |
| Total Heat Dissipation |
3.6 W |
| Operating Temperature |
0 to 60 degC (32 to 140 degF) |
Installation Guidelines
- Ensure the SLC 500 chassis power is disconnected before installing or removing the module.
- Align the module with the chassis guide rails and seat it firmly into the backplane connector.
- Secure the module using the top and bottom retaining screws to ensure proper grounding and mechanical stability.
- Use shielded cabling for input signals to minimize EMI, especially in high-noise industrial environments.
- Ensure that the input voltage does not exceed the 10–30V DC range to prevent damage to the input circuitry.
- Maintain adequate ventilation around the chassis to ensure heat dissipation remains within specified limits.
FAQ
What is the input type for the 1746-IB16?
The 1746-IB16 is a current-sinking input module, meaning it requires the field device to switch the positive voltage to the input terminal.
Does this module include the terminal block?
Yes, the 1746-IB16 comes with a removable terminal block to facilitate easier field wiring and module replacement.
What is the signal delay for this module?
The module features a hardware-based signal delay of 8 ms for both ON and OFF transitions to help filter out mechanical switch chatter and electrical noise.
