The Allen-Bradley 1756-OB16EK, also cataloged as the 1756-OB16EK DC Output Module, operates as a dedicated hardware component for discrete signal execution within ControlLogix automation platforms.

Hardware Specifications

ControlLogix Deterministic Architecture

The 1756-OB16EK integrates with ControlLogix backplane bus communication, supporting high-speed deterministic data transfer. It utilizes I/O density scaling to optimize slot utilization within the chassis, while firmware flash compatibility ensures alignment with existing controller logic. The module supports Profinet / EtherNet/IP deterministic network environments, enabling precise time-stamping and execution of output states across complex control topologies.

Ordering Info

• 1 unit 1756-OB16EK DC Output Module

• 1 set of electronic fuse status indicators (integrated)

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

Field Installation Guidelines

• Insertion: Ensure the module is seated fully into the chassis slot and secured by the top and bottom latching mechanisms.

• Wiring: Terminate field wiring to the compatible 1756-TBNH or 1756-TBSH terminal block before seating the block onto the module.

• Power: Confirm that the field-side power supply is within the 10-30 VDC range before initiating module power-up.

• Grounding: Maintain a clear connection between the terminal block shield terminals and the chassis common ground to mitigate electromagnetic interference.

Frequently Asked Questions

• Does the 1756-OB16EK support RIUP (Removal and Insertion Under Power)?

  Yes, the module is designed to support RIUP, allowing for removal or insertion while the chassis is powered without disrupting other slots.

• How does the electronic fusing function?

  Each output point features integrated electronic current limiting. If an overload occurs, the specific output state is set to 'off' and status is reported to the controller.

• Is the module isolation rating continuous?

  Yes, the module provides a 50 V continuous isolation voltage, tested for Basic Insulation between the field side and the backplane.

• Can the module operate outside the 10-30 VDC range?

  No, operating outside this voltage range may cause erratic output behavior or damage to the electronic fuse protection circuitry.

• Are the terminal blocks included with the module?

  No, terminal blocks (1756-TBNH or 1756-TBSH) are required accessories and must be procured separately for installation.

• How is the module status monitored?

  Visual status is provided via front-panel LED indicators, while operational diagnostics are mapped directly to the controller tags via the backplane.

• What is the maximum current rating per module?

  The total module current is limited to 8 A when operating at a 60 deg C ambient temperature.

• Does this module require firmware updates?

  Firmware is periodically updated to improve diagnostic reporting and compatibility with newer versions of the ControlLogix controller backplane.