Product Introduction
The Allen-Bradley 1746-IV16 is a robust SLC 500 discrete input module engineered for industrial control systems. With its 16 sourcing input channels, this module interfaces seamlessly with switches, auxiliary contacts, sensors, and other binary signaling devices. The 1746-IV16 accepts a nominal input voltage of 24VDC and operates across a wide 10-30VDC range, ensuring flexibility in diverse plant environments.
As a single-slot module, the 1746-IV16 installs directly into any 1746 chassis, serving as either a local or remote I/O module. It features 16 LED status indicators for quick diagnostics and a removable terminal block that simplifies wiring and replacement. This module is a dependable choice for general-purpose DC input applications within SLC 500 systems.
Technical Specifications
The table below outlines the key electrical and performance parameters of the Allen-Bradley 1746-IV16, sourced directly from the manufacturer's data.
| Specification |
Value |
| Manufacturer |
Rockwell Automation |
| Module Type |
Discrete input module |
| Series |
SLC 500 |
| Part Number / Catalog No. |
1746-IV16 |
| Brand |
Allen-Bradley |
| Nominal Input Voltage |
24VDC |
| Input Voltage Range |
10-30 VDC |
| Wiring Configuration |
Source wiring configuration |
| Backplane Current Consumption |
0.085 A |
| Signal Delay, Max. Resistive Load |
On = 0.3 ms; Off = 0.5 ms |
| Off-state Voltage, Max |
5VDC |
| Off-state Current, Max |
1.0 mA |
| Nominal Input Current |
8 mA at 24VDC |
| Voltage Range |
10 to 30 Volts DC Source |
| Inputs |
16 |
| Backplane Current (5 Volts DC) |
85 milliamps |
| Signal Delay |
8 milliseconds |
| Off State Current |
1 milliamps |
| Applications |
Combination 120 Volts AC I/O |
| UPC |
10662468092750 |
Industry Applications
The Allen-Bradley 1746-IV16 excels in applications requiring reliable monitoring of discrete signals. In manufacturing, it interfaces with proximity sensors and limit switches to track machine positions and part presence. In material handling systems, the module reads signals from photo-eyes and conveyors, enabling precise sorting and routing. The 1746-IV16 also suits building automation for monitoring door contacts and alarm circuits.
Its source wiring configuration proves advantageous when input devices do not supply their own voltage, as the module provides the signal voltage to the loop. This feature simplifies wiring and reduces external power requirements, making the 1746-IV16 a practical choice for retrofits and new installations alike.
Installation & Setup Guidance
Installing the Allen-Bradley 1746-IV16 is straightforward. First, ensure the SLC 500 chassis is powered down. Slide the module into any available slot until it seats firmly, then tighten the retaining screws. Connect field wiring to the removable terminal block, observing the source wiring configuration. Each input channel accepts 10-30VDC signals; verify polarity and voltage levels before energizing.
After wiring, power up the system and monitor the LED indicators. Each LED corresponds to an input channel, illuminating when the channel is active. Use the module's input status in your ladder logic program to verify correct operation. The removable terminal block allows pre-wiring, reducing downtime during module swaps.
Maintenance & Reliability
Routine maintenance for the 1746-IV16 is minimal. Periodically inspect the terminal block connections for tightness and signs of corrosion. Keep the module free from dust and debris to ensure proper airflow and heat dissipation. The operating environment should remain within 0 to 60°C (32 to 140°F) and 5 to 95% noncondensing relative humidity.
The module's optical coupling and filter circuitry reduce signal noise, enhancing reliability in industrial settings. With no moving parts, the 1746-IV16 offers long service life, minimizing downtime and maintenance costs. Regularly review input status via LED indicators to catch potential wiring issues early.
Compatibility & Integration
The 1746-IV16 integrates seamlessly with the SLC 500 family, including modular and fixed processors. It supports both local and remote I/O configurations, and its input data is accessible via ladder logic programming. The module communicates over the backplane, requiring 85 mA at 5VDC. Its removable terminal block and 16 input channels make it compatible with a wide range of field devices.
As a standard SLC 500 module, the 1746-IV16 works with existing 1746 chassis and power supplies. No special cabling is needed beyond standard terminal wiring. This compatibility ensures easy integration into existing control panels.
Selection Guide & Purchasing Advice
When selecting the Allen-Bradley 1746-IV16, verify your system's input voltage requirements and wiring configuration. Confirm that your SLC 500 chassis has an available slot and sufficient backplane power. If you are replacing an existing module, check the wiring diagram to ensure compatibility.
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