Configured for high-density discrete signal execution in ControlLogix automation platforms, the Allen-Bradley 1756-OB16DK (1756-OB16DK Diagnostic DC output module) provides direct physical/electrical execution.

Module Configuration Matrix

• Series: ControlLogix

• Function: Diagnostic DC Output

• Point Count: 16-Point

• Voltage Input: 24 VDC Source

• Operating Range: 19.2-30 VDC

Hardware Specifications

ControlLogix Deterministic Architecture

The 1756-OB16DK utilizes high-speed backplane bus communication to ensure deterministic data transfer within the controller rack. The module supports I/O density scaling, allowing for efficient slot allocation in high-density applications. Firmware flash compatibility is supported, ensuring the diagnostic logic remains current with system requirements and allows for seamless integration into EtherNet/IP deterministic network environments.

Ordering Info

• 1 unit 1756-OB16DK Diagnostic DC Output Module

• Note: Removable Terminal Blocks (1756-TBCH or 1756-TBS6H) must be ordered separately.

Field Installation Guidelines

• Insertion: Ensure the module is fully seated into the ControlLogix chassis slot until the locking latches engage.

• Wiring: Terminate all field wiring to the chosen 1756-TBCH or 1756-TBS6H terminal block before final assembly.

• Grounding: Connect the module chassis ground terminal to the rack backplane ground stud to minimize electromagnetic interference.

• Power: Verify the supply voltage remains within the 19.2-30 VDC range to prevent diagnostic fault triggering.

Frequently Asked Questions

• Does the module support Removal and Insertion Under Power (RIUP)?

  Yes, the 1756-OB16DK supports RIUP, allowing module maintenance without powering down the entire chassis.

• What diagnostic capabilities are provided?

  The module provides per-point diagnostics, including feedback for open-wire, short-circuit, and output-state mismatch detection.

• Is the terminal block included?

  No, terminal blocks (1756-TBCH or 1756-TBS6H) are separate items and are required for module operation.

• What is the total module current limit?

  The total current is 8 A at 30 deg C, de-rating to 4 A at 60 deg C ambient temperature.

• How is the module isolated?

  The module features 50 V continuous isolation between the field side and the backplane circuitry.

• Does this module require special firmware versions?

  Ensure your controller firmware is compatible with the latest revisions to utilize advanced diagnostic mapping in your project files.

• How is diagnostic data accessed?

  Diagnostic data is mapped directly to controller tags, allowing for real-time monitoring via the Logix design software.

• Can this module drive inductive loads?

  Yes, but external clamping or suppression is recommended to mitigate voltage spikes during inductive load de-energization.