Product Details
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.
| Feature | Specification |
| Number of Inputs | 16 Channels |
| Voltage Category | 125V DC |
| Operating Voltage Range | 90–146V DC |
| Backplane Current (5V) | 0.085 A |
| Backplane Current (24V) | 0.000 A |
| Signal Delay (Max) | 8ms (On to Off) / 8ms (Off to On) |
| Weight | 1.00 lbs (0.45 kg) |
Engineering Advantages
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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.
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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.
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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.
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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
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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.
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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.
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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.
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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.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Understanding Marshalling Cabinets in Industrial Automation and Control Systems
Marshalling cabinets serve as the crucial connection hub between field instruments and centralized processing units. In large DCS and PLC control system architectures, hundreds of multipair field cables run from local junction boxes to the central instrument equipment room. The marshalling cabinet houses field terminal blocks, surge arresters, intrinsic safety isolation barriers, and interposing relays. By segregating field field-wiring terminations from sensitive processor hardware, engineers protect expensive controller backplanes from high-voltage transients. Consequently, this modular separation dramatically streamlines maintenance workflows and simplifies system expansion.
Essential Best Practices for PLC Wiring and Installation in Industrial Automation
Successful control system deployment begins with thoroughly reviewing manufacturer technical documentation. Controllers from major brands like Allen-Bradley, Siemens, and Schneider Electric feature unique terminal layouts. Engineers must verify voltage requirements before connecting power cables to prevent catastrophic equipment damage. Standard line connections require strict adherence to regional electrical codes and proper wire color coding. Furthermore, panel builders should always establish a robust low-impedance ground connection using at least 16-AWG copper conductor tied directly to the main plant grounding grid.
Demystifying Programmable Logic Controllers: Comprehensive Guide to PLC Classification and Selection in Industrial Automation
Modern industrial automation heavily relies on Programmable Logic Controllers (PLCs) to drive factory floor efficiency. Over my 15 years as an industrial automation expert working with DCS, TSI, and control systems, I have seen PLCs evolve into the central nervous system of modern manufacturing. Selecting the right controller requires a deep understanding of PLC types based on physical size, hardware architecture, and power supply configurations.