Product Overview

The Allen-Bradley 1746-ITV16​ is a 16-point, 24V DC digital input module designed for the Allen-Bradley SLC 500 modular programmable controller system. This specific module, with the common hardware revision 1746-ITV16-A, is engineered to interface field devices that provide a “sourcing” DC signal to the PLC. In electrical terms, a sourcing field device (like a PNP proximity sensor) provides a positive voltage (+24V DC) when active. The Allen-Bradley 1746-ITV16​ is configured as a “sinking” input module; it provides a common connection to the DC negative (Common) and “sinks” the current from each active input point to complete the circuit. This module is a critical interface that converts the state of real-world devices—such as pushbuttons, limit switches, proximity sensors, and photoelectric eyes—into a digital logic level (1 or 0) that the SLC 500 processor can read and evaluate within its control program.Occupying a single slot in an SLC 500 chassis (like the 1746-BAS), the 1746-ITV16-A​ provides a high-density, 16-point solution for gathering discrete status information. Its value lies in its robust industrial design, offering reliable signal conditioning and electrical isolation to protect the sensitive backplane and CPU from voltage transients, noise, and wiring errors present in the plant environment. Each input channel is individually isolated and includes filtering to debounce mechanical switch contacts and reject electrical noise, ensuring clean and accurate data for the control logic. The module’s design simplifies wiring with a removable terminal block that accommodates standard wire gauges, and its front panel features LEDs that indicate the status (ON/OFF) of each input point, enabling quick visual diagnostics during operation or troubleshooting. The Allen-Bradley 1746-ITV16​ is a fundamental building block for creating reliable machine control systems, enabling the PLC to safely and accurately monitor the state of a wide array of industrial sensing devices.

Technical Specifications