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

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.