Description

Brief Product Description

The Allen-Bradley 1756-IV16 monitors 16 sourcing digital inputs to provide high-speed data processing for ControlLogix systems. This module organizes 24V DC field signals into two isolated groups, utilizing adjustable hardware and software filters to ensure precise signal integrity.

Product Description

High-Density Sourcing Input Architecture

The Allen-Bradley 1756-IV16 powers a premier sourcing digital input interface specifically for the ControlLogix 1756 chassis. Because this module employs a sourcing configuration, it actively receives current from field devices, which makes it perfectly compatible with NPN sensors and other sinking field equipment. The unit manages 16 independent input channels by dividing them into two isolated groups of eight. Consequently, this grouping enhances electrical segmentation and simplifies your wiring across distinct power zones. To facilitate a secure connection to the chassis backplane, the module requires a Removable Terminal Block (RTB) such as the 1756-TBNH or 1756-TBSH. By using these RTBs, maintenance teams can pre-wire the system and replace modules without disturbing the field terminations.

Precision Signal Timing and Filtering

Timing accuracy defines the performance of the 1756-IV16 Digital Input Module. The module incorporates user-definable filter times that effectively eliminate electrical noise and contact bounce from your field signals. For instance, during the “Off-to-On” transition, the hardware delay typically reaches only 280 microseconds. Furthermore, the “On-to-Off” hardware transition averages 540 microseconds. To improve reliability even further, engineers can refine these signals by selecting software filter times ranging from 0 to 18 milliseconds. This granular control guarantees that the Logix processor receives clean, debounced data, which remains essential for high-speed automated processes and safety-monitored loops within the GuardLogix environment.

Electrical Performance and Environmental Resilience

Engineered for efficient power management, the 1756-IV16 draws only 0.61 Watts of backplane power. The module sustains operations across a flexible voltage window of 10 to 30 Volts DC, maintaining a nominal rating of 24 Volts DC. In addition to power efficiency, its robust electrical design includes a continuous isolation rating of 250 Volts. This barrier protects your sensitive backplane circuitry from field-side electrical surges. Moreover, the hardware manages thermal loads with high efficiency, dissipating up to 5.1 Watts even at peak operating temperatures of 60°C. These characteristics ensure long-term reliability in dense control cabinets where thermal management and signal isolation remain top priorities.

Technical Specifications