1756-IB16D | Allen-Bradley | ControlLogix 16-Point Diagnostic Digital DC Input Module

Product Overview

The 1756-IB16D provides high-density, diagnostic-grade digital sensing for the Allen-Bradley ControlLogix platform. This 16-point DC input module operates with sinking electronics and includes advanced onboard diagnostics to identify field-side wiring faults. It monitors the health of each circuit, detecting open-wire and short-circuit conditions in real-time to prevent process interruptions. We supply this unit as 100% Brand New original stock, ensuring your automated systems benefit from the highest levels of hardware intelligence and fault visibility.

Technical Specifications

The 1756-IB16D utilizes a robust electrical architecture to interface with 24V DC field devices:

• Inputs: 16 Diagnostic Inputs (Sink)

• Nominal Input Voltage: 12/24V DC

• Operating Voltage Range: 10–30V DC

• Backplane Current (5V): 150 mA

• Backplane Current (24V): 120 mA

• Input Delay Time: 4 ms plus user-selectable filter time

• Minimum Operating Current: 2 mA @ 10V DC

• Maximum Operating Current: 13 mA @ 30V DC

• Off-State Current (Max): 1.5 mA per point

• Power Dissipation: 5.8 Watts maximum at 60°C

• Weight: 0.38 lbs (0.17 kg)

Engineering Advantages

• Integrated Field-Side Diagnostics: This module identifies specific fault conditions, including open-wire and short-circuit states. This feature eliminates the need for manual troubleshooting with a multimeter, allowing maintenance teams to pinpoint failed field sensors or damaged cables directly from the HMI.

• Enhanced Fault Visibility: The 1756-IB16D provides diagnostic data to the controller for every individual point. Engineers can use this data to trigger specific safety routines or maintenance alarms, significantly reducing Mean Time to Repair (MTTR).

• Selectable Input Filtering: Digital filtering options allow users to tune the module's responsiveness to the specific electrical environment. This prevents "contact bounce" from mechanical switches and filters out high-frequency noise from nearby VFDs or heavy motor starters.

• Robust Thermal Performance: The hardware maintains stable operation up to 60°C. Efficient heat dissipation design ensures the module performs reliably in crowded, unventilated ControlLogix chassis without triggering thermal derating.

FAQs

• Is the 1756-IB16D supplied as a brand new original part?

  Yes. We provide this module strictly as 100% Brand New original factory stock. Each unit arrives in its original Allen-Bradley packaging with factory seals intact to guarantee peak diagnostic accuracy and hardware longevity.

• What is the difference between the 1756-IB16 and the 1756-IB16D?

  The "D" designation stands for Diagnostics. While the standard IB16 only monitors On/Off states, the 1756-IB16D detects field-side faults such as open-wire and short-circuit conditions, providing significantly more data to your control program.

• Which Removable Terminal Block (RTB) should I use with this module?

  The 1756-IB16D requires a 36-position RTB. You can use the 1756-TBCH (cage clamp) or the 1756-TBSH (spring clamp). Always verify the wiring requirements of your specific cabinet before selecting the termination style.

• Can I replace a standard IB16 with an IB16D without code changes?

  While the physical wiring and voltage ratings are compatible, the 1756-IB16D requires different configuration profiles in Studio 5000/RSLogix 5000 to utilize the diagnostic tags. You must update the I/O configuration in your project to recognize the diagnostic features of the module.