Allen-Bradley 1756-IV16 Digital Input Module

The Allen-Bradley 1756-IV16 serves as a high-density digital sourcing input module for the ControlLogix system. This module features 16 distinct channels organized into two isolated groups of eight. It effectively interfaces with 12V or 24V DC field devices to provide real-time status updates to the controller. Furthermore, the sourcing configuration means the module receives current from the connected input device. This architecture ensures seamless integration with a variety of industrial sensors and switches. Consequently, users achieve reliable data acquisition across their automated production lines.

Adjustable Timing and Signal Filtering

This module allows for precise control over signal response through user-definable filter times. Operators can select specific hardware delays to eliminate electrical noise from the input signal. For instance, the “off-to-on” transition supports filter settings up to 2 milliseconds. Conversely, the “on-to-off” transition offers expanded filtering options up to 18 milliseconds. These adjustments prevent false triggering caused by contact bounce or electromagnetic interference. Moreover, the low backplane power consumption of 0.61W optimizes the overall chassis energy efficiency.

Thermal Management and Durability

The 1756-IV16 design prioritizes stable operation under high-temperature industrial conditions. It manages a maximum power dissipation of 5.1 watts when operating at 60°C. Additionally, the thermal dissipation rating of 18.47 BTU per hour prevents overheating within the rack. The compact form factor allows for high-density I/O configurations in standard ControlLogix chassis. Furthermore, the module maintains a high off-state voltage threshold of 5V DC. This margin ensures that the system correctly identifies inactive signals despite minor residual currents.

Integration and Chassis Deployment

Installing the 1756-IV16 requires a Removable Terminal Block (RTB) to complete the field wiring. The module supports hot-swapping under power to minimize system downtime during maintenance. Moreover, the ControlLogix backplane provides fast data synchronization for high-speed logic execution. This hardware remains an essential component for distributed I/O architectures in manufacturing. By utilizing this sourcing input module, facilities enhance their diagnostic capabilities and signal reliability. The 1756-IV16 continues to be a standard choice for modern factory automation.

Core Technical Specifications

• Number of Inputs: 16 Sourcing Channels
• Voltage Category: 12/24V DC Source
• Operational Voltage Range: 10V DC to 30V DC
• Nominal Input Voltage: 24V DC
• Maximum Inrush Current: 250 mA
• Input Impedance: 3.2 kΩ at 30V DC
• Isolation Voltage: 250V Continuous
• Compatible Terminal Blocks: 1756-TBNH or 1756-TBSH