Allen-Bradley 1746-IH16 SLC 500 Digital DC Input Module

Product Overview

The 1746-IH16 functions as a high-density discrete input interface for the Allen-Bradley SLC 500 chassis. It provides 16 isolated channels designed specifically to sense high-voltage DC signals (125VDC nominal). This module bridges the gap between high-voltage field devices and the low-voltage logic of the PLC processor. Despite the manufacturer’s discontinued status, we offer 100% Brand New, original units to ensure the continued operation of your mission-critical control systems.

Technical Specifications

This module features a robust hardware profile designed for heavy-duty switching environments.

Engineering Advantages

• High-Voltage Direct Sensing: The 1746-IH16 eliminates the need for interposing relays when monitoring 125VDC circuits. This simplifies cabinet wiring, reduces points of failure, and saves significant DIN rail space.

• Enhanced Noise Immunity: The high-voltage threshold inherently rejects low-level electromagnetic interference (EMI) and crosstalk from adjacent AC cables, ensuring signal integrity in electrically "noisy" power plants or substations.

• Seamless Backplane Integration: The module slides directly into any available slot in a 1746 chassis. It draws minimal current from the SLC backplane, allowing engineers to maximize the I/O density without overloading the power supply.

• Rapid Fault Recovery: By utilizing 100% Brand New factory-sealed modules, maintenance teams avoid the risks associated with aged capacitors or degraded terminal blocks found in used equipment, ensuring immediate system restoration.

FAQs

• Can I use the 1746-IH16 in a remote I/O rack?

  Yes. The module operates flawlessly in any local SLC 500 chassis or a remote 1747-ASB/ACNR adapter-linked rack, provided the backplane supports 1746 I/O.

• What is the primary difference between this and standard 24VDC modules?

  The 1746-IH16 targets high-voltage utility and power generation applications. It requires a minimum of 90VDC to register an "On" state, whereas standard modules trigger at much lower thresholds.

• Does this module require a separate external power supply for the inputs?

  Yes. You must provide the 125VDC field power to the input terminals. The module only draws logic-side power (5VDC) from the PLC backplane.

• Is this unit compatible with the SLC 5/01, 5/02, 5/03, 5/04, and 5/05 processors?

  Absolutely. The 1746-IH16 maintains universal compatibility across the entire SLC 500 processor range, ensuring a versatile fit for any legacy system upgrade or repair.