Technical Specifications Breakdown
Key parameters for the 1746-IH16 are listed below for quick reference:
| Feature | Specification |
|---|---|
| Module Type | Digital DC Input Module |
| Inputs | 16 |
| Voltage Range | 90-146 Volts DC Sink |
| Backplane Current (5 Volts DC) | 85 milliamps |
| Signal Delay | 9 milliseconds |
| Off State Current | 0.8 milliamps |
| Applications | General Purpose 125 Volts DC Inputs |
| I/O Connection | 1746-HT and 1746-HCA |
| Step Response | 100 milliseconds in, 2.5 milliseconds out |
Industry Applications
125V DC Discrete Sensing in Heavy Industry
The 90-146V DC sink input range allows direct connection to station batteries without additional converters, reducing component costs.
Hazardous Location Automation
With approval for Class 1, Division 2, Groups A, B, C, or D environments, the 1746-IH16 eliminates the need for expensive isolation barriers in many applications. This lowers installation costs while maintaining safety compliance.
Cost-Effective Retrofits for Legacy Systems
Upgrading from older 125V DC input cards to the 1746-IH16 reduces power consumption (5.17W dissipation) and improves signal integrity. The 9 ms signal delay ensures consistent response, minimizing false triggers and production stoppages.
Installation & Setup Guidance
Mount the 1746-IH16 in any free slot of a 1746 I/O chassis. Ensure backplane current draw does not exceed chassis capacity; this module draws 85 mA at 5V DC. Use the provided Removable Terminal Block (RTB) for field wiring. For Class 1, Division 2 installations, follow applicable wiring methods per local codes. The module supports up to 16 points per common, simplifying field wiring and reducing terminal count.
Maintenance & Reliability
The 1746-IH16 operates reliably from 0 to 60 °C with 5-95% non-condensing humidity. Its 30G shock and 2.5G vibration (57-200 Hz) ratings ensure longevity in demanding industrial settings. No routine calibration is required; periodic inspection of connections and environmental conditions is recommended. The module's 5.17W heat dissipation reduces thermal stress on adjacent components, extending overall system life.
Optimize Your Control System with the Allen-Bradley 1746-IH16
When designing or maintaining a cost-efficient industrial automation system, every component choice impacts both upfront capital and long-term operational expenses. The Allen-Bradley 1746-IH16 SLC 500 digital DC input module delivers reliable 125V DC sensing while minimizing energy waste and maintenance downtime. By selecting this module, you reduce total cost of ownership through its low power dissipation and robust design for harsh environments.
Compatibility & Integration
It uses standard 1746-HT or 1746-HCA wiring arms for field connections. The 1746-IH16 is C-UL and CSA certified, simplifying approvals for global installations. Its circuit isolation between inputs and logic enhances noise immunity per NEMA ICS 2-230.
Selection Guide & Purchasing Advice
When selecting a 125V DC input module, consider the total number of points, voltage range, and environmental approvals. The 1746-IH16 offers 16 sinking inputs in a compact form factor. For pricing, availability, and lifecycle status, contact AutoDCSTech. Our team can help you verify compatibility with your existing SLC 500 system and recommend cost-saving alternatives if needed.
Troubleshooting & Common Issues
If inputs fail to register, first verify that the supply voltage is within the 90-146V DC range. Check the off-state leakage current (0.8 mA max) — excessive leakage from sensors can cause false ON signals. Use a multimeter to measure voltage at the RTB terminals. For intermittent faults, inspect the 1746-HT or 1746-HCA connection for corrosion or loose wires. The 9 ms signal delay helps filter noise; if response is too slow, consider the 100 ms in/2.5 ms out step response for specific applications.
Availability & Condition at AutoDCSTech
| Part Number | 1746-IH16 |
|---|---|
| Availability | In Stock |
| Condition | New |
| Warranty | One Year |
| Origin | US |
