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Help CenterAllen-Bradley 1746-IH16 is a SLC 500 Digital DC Input Module
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At Rossonix Co., Limited, we specialize in providing reliable industrial automation components to a global clientele. As a supplier with over a decade of experience since 2011, we understand the critical need for durable and precise control modules in modern manufacturing. The Allen-Bradley 1746-IH16 SLC 500 Digital DC Input Module is a cornerstone component for robust control systems, designed to interface real-world DC sensor signals with the trusted SLC 500 programmable logic controller platform. This module ensures reliable data acquisition, which is fundamental for process monitoring, safety interlocks, and efficient machine control.
The 1746-IH16 module is engineered for performance and integration ease. Its primary role is to convert signals from field devices like push buttons, limit switches, and proximity sensors into a logic format the SLC 500 CPU can process. Here are its defining characteristics and technical advantages:
- High-Density Input Design: With 16 individual input channels, this module maximizes I/O point usage within a single slot of the SLC 500 chassis, optimizing control cabinet space and reducing overall system cost.
- 24V DC Sinking Input Compatibility: It is configured for sinking (NPN) input logic, a common standard in industrial environments. This makes it compatible with a vast array of 24V DC sensors and switches.
- Enhanced Diagnostic Capabilities: Each of the 16 input points features an individual LED indicator, providing instant visual confirmation of the input status (ON/OFF). Additional module status LEDs offer quick troubleshooting for power and communication health.
- Grouped Isolation: The inputs are organized into groups, typically with 8 points sharing a common terminal. This design provides electrical isolation between groups, enhancing system stability and simplifying wiring practices.
- Rugged Industrial Construction: Built to withstand the electrical noise, vibration, and temperature variations found in industrial settings, ensuring long-term operational reliability.
- Seamless SLC 500 Integration: The module is automatically recognized by the SLC 500 controller. Configuration is straightforward within Rockwell Automation's RSLogix 500 programming software, minimizing setup time and complexity.
For system integrators and maintenance engineers, the 1746-IH16 translates into tangible benefits: reduced machine downtime through quick diagnostics, lower spare parts inventory due to its commonality, and a future-proofed design that integrates with the extensive SLC 500 ecosystem.
Below is a summary of the key technical specifications for the Allen-Bradley 1746-IH16 module:
| Specification | Detail |
| Catalog Number | 1746-IH16 |
| Module Type | Digital DC Input |
| Input Voltage | 24V DC |
| Number of Inputs | 16 |
| Input Current (Nominal) | Typically 4-6 mA per point @ 24V DC |
| Input Logic | Sinking (NPN) |
| On-State Voltage Range | 10V to 30V DC |
| Off-State Voltage | 0 to 5V DC |
| Isolation | Grouped (e.g., 8 points per common) |
| Backplane Current Draw (5V) | 0.12A (Approximate) |
| Status Indicators | Per-point (16) and Module Status LEDs |
Rossonix Co., Limited is committed to quality and customer satisfaction, as reflected in our adherence to ISO9001 and ISO9000 quality management standards. With an annual export value in the range of US$5-10 Million and a presence in key markets from North America and Western Europe to Asia and Oceania, we have built a reputation for reliable supply chain solutions. Our strategic shipping points in Shenzhen, Hong Kong, and Europe enable efficient logistics to meet your project timelines. When you source the Allen-Bradley 1746-IH16 from us, you are not just buying a component; you are gaining a partner dedicated to supporting your automation needs with genuine products and professional service. Contact us today to discuss your requirements or to place an order.
Frequently Asked Questions (FAQ)
Q1: What is the difference between a sinking (NPN) and a sourcing (PNP) input module?
A1: The 1746-IH16 is a sinking input module. This means it expects to receive current *from* the field device (like a sensor) *into* the input terminal to register an ON signal. A sourcing module provides current *to* the field device. It is crucial to match the module type with your field devices to ensure proper operation.
Q2: Can I mix AC and DC devices on this module?
A2: No. The 1746-IH16 is designed exclusively for 24V DC input signals. Connecting AC devices can damage the module. For AC signals, you would need a dedicated AC input module from the SLC 500 series.
Q3: How are the 16 input points grouped or isolated?
A3: The inputs are typically arranged in groups, often with 8 points sharing one common connection terminal. This provides isolation between groups but not between individual points within the same group. Refer to the wiring diagram for the specific grouping configuration.
Q4: Is this module compatible with all SLC 500 processors and chassis?
A4: Yes, the 1746-IH16 is compatible with all SLC 5/01, SLC 5/02, SLC 5/03, SLC 5/04, and SLC 5/05 processors, and it can be installed in any 1746 series I/O chassis.
Q5: What is the typical response time of the inputs?
A5: Digital input modules like the 1746-IH16 have very fast response times, typically in the range of milliseconds. The exact on/off delay is specified in the technical data sheet and is suitable for the vast majority of industrial applications.
Q6: Do you provide technical documentation or wiring diagrams with the module?
A6: While the physical module may not include a full manual, comprehensive technical documentation, including wiring diagrams and specifications for the 1746-IH16, is readily available from the manufacturer (Rockwell Automation) and can be provided upon request to assist with your integration.
Q7: Can this module be used in safety-critical applications?
A7: The standard 1746-IH16 is a general-purpose digital input module and is not certified for safety-related functions (e.g., emergency stops). For safety applications, specially designed and certified safety modules should be used.
Q8: What is the operating temperature range for this module?
A8: Allen-Bradley SLC 500 I/O modules are generally rated for operation within an industrial temperature range, such as 0°C to 60°C (32°F to 140°F). For the precise specification, please consult the official datasheet.
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