Overview
The Allen-Bradley 1746-IV16 is a dedicated digital input module for the SLC 500 family of programmable logic controllers. This 16-channel current-sourcing module accepts DC voltage inputs from field devices such as proximity sensors, limit switches, and photoelectric sensors, converting them to digital logic states accessible by all SLC 500 processors. With a nominal operating voltage of 24V DC and a wide 10–30V DC operating range, the 1746-IV16 accommodates diverse industrial environments and variable supply conditions.
Key Features
- 16 sourcing DC input channels with 16 points per common
- Nominal 24V DC operation; 10–30V DC operating voltage range
- Fast signal response: 0.3 ms on-delay, 0.5 ms off-delay maximum
- Removable terminal blocks for tool-free wiring changes and quick module swap
- Front-panel LED indicators for real-time input status visibility
- Optical isolation and internal filter circuitry for noise immunity
- Compatible with all modular and fixed SLC 500 processor platforms
Technical Specifications
- Number of Inputs: 16 channels
- Input Type: Current sourcing (module provides signal loop voltage)
- Nominal Input Voltage: 24V DC
- Operating Voltage Range: 10–30V DC
- Nominal Input Current: 8 mA @ 24V DC
- Off-State Current Maximum: 1 mA @ 5V DC
- Backplane Current Load: 85 mA @ 5V
- Maximum Power Dissipation: 3.6 W
- Signal On-Delay: 0.3 ms maximum
- Signal Off-Delay: 0.5 ms maximum
- Operating Temperature: 0–60°C (32–140°F)
- Humidity: 5–95% non-condensing
Typical Applications
The 1746-IV16 is ideal for general-purpose DC input monitoring in discrete manufacturing, process automation, material handling, and assembly lines. Common uses include:
- Proximity and inductive sensor signal acquisition
- Limit switch and solenoid status monitoring
- Emergency stop and interlocking circuit inputs
- Pressure switch and flow sensor inputs
- Binary state detection from auxiliary electrical contacts
Compatibility & Replacements
The 1746-IV16 plugs into any available slot on the 1746 I/O chassis, functioning as a local or remote module when paired with appropriate communication adapters. Accessible by all SLC 500 processor variants (SLC 5/01, 5/02, 5/03, 5/04, 5/05). Related input modules include the 1746-IB16 (sinking configuration) and 1746-IV32 (32-channel variant). The removable terminal block design enables plug-and-play replacement without rewiring—a significant advantage during emergency maintenance or system upgrades.
