Allen-Bradley 1756-OB16D
Allen-Bradley 1756-OB16D
Allen-Bradley 1756-OB16D
Allen-Bradley 1756-OB16D
Allen-Bradley 1756-OB16D
Allen-Bradley 1756-OB16D
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1756-OB16D

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The Allen-Bradley 1756-OB16D is a 16-point 24V DC diagnostic output module for ControlLogix systems, offering per-point monitoring, electronic fusing, and high-speed switching performance. It delivers reliable output control with built-in diagnostics and fault detection for industrial automation environments.
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Technical specifications for 1756-OB16D

  • Manufacturer:
    Allen-Bradley
  • Part Number:
    1756-OB16D
  • Product Family:
    ControlLogix
  • Product Type:
    ControlLogix 16 Pt 24V DC D/O Module
  • Short trip:
    8 A for 180 ms, min, 10 A for 120 ms, min
  • No load:
    Off-state detection only
  • Output verification:
    On-state detection only
  • Pulse test:
    Configurable maximum pulse width
  • Time stamp of diagnostics:
    ±1 ms
  • Outputs:
    16 diagnostic (8 points/group)
  • Pilot duty (DC-13SQ):
    2A @ 30°C (86 °F), 1A @ 60°C (140 °F)
  • Voltage category:
    24V DC source
  • Operating voltage range:
    19.2…30V DC
  • Output delay time Off to On:
    60 µs nom/1 ms max
  • Output delay time On to Off:
    630 µs nom/5 ms max
  • Current draw @ 5.1V:
    250 mA
  • Current draw @ 24V:
    140 mA
  • Total backplane power:
    4.64 W
  • Power dissipation, max:
    3.3 W @ 60 °C (140 °F)
  • Thermal dissipation:
    11.25 BTU/hr
  • Off-state leakage current per point, max:
    1 mA per point
  • On-state voltage drop, max:
    1.2V DC @ 2 A
  • Current per point, max:
    2 A @ 30 °C (86 °F) linear derating, 1 A @ 60 °C (140 °F) linear derating
  • Current per module, max:
    8 A @ 30 °C (86 °F) linear derating, 4 A @ 60 °C (140 °F) linear derating
  • Surge current per point:
    4 A for 10 ms per point, repeatable every 1 s
  • Load current, min:
    3 mA per point
  • Scheduled outputs:
    Synchronization within 16.7 s max, reference to the Coordinated System Time
  • States in Fault mode per point:
    Hold last state, On or Off (Off is default)
  • States in Program mode per point:
    Hold last state, On or Off (Off is default)
  • Module keying:
    Electronic, software configurable
  • Fusing:
    Electronically fused per point
  • Removable terminal block:
    1756-TBCH, 1756-TBS6H
  • RTB keying:
    User-defined mechanical
  • Temperature, operating:
    0 °C < Ta < 60 °C (32 °F < Ta < 140 °F)
  • Temperature, surrounding air, max:
    60 °C (140 °F)
  • Temperature, nonoperating:
    -40…+85 °C (-40…+185 °F)
  • Relative humidity:
    5…95% noncondensing
  • Vibration:
    2 g @ 10…500 Hz
  • Weight:
    0.35 kg
  • Estimated shipping dimensions:
    23.3x18.3x5.3cm
  • Tariff Code:
    8708709900
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Environment Installation Use Cases

Features:

  • 16-point 24V DC diagnostic output structure with per-point fault detection and monitoring capability
  • High-speed switching performance with microsecond-level response and configurable pulse testing functions
  • Integrated electronic fusing and 250V isolation ensuring safe and reliable industrial operation
The Allen-Bradley 1756-OB16D is widely used in ControlLogix automation systems where precise output control and diagnostic visibility are required. It provides 16 digital output channels operating at 24V DC, each capable of delivering fault status information to improve system monitoring. This makes the 1756-OB16D suitable for complex industrial environments such as manufacturing lines and process automation systems. Its structured output grouping supports efficient wiring and system organization. The module contributes to stable machine operation by ensuring controlled output execution.

In practical operation, the 1756-OB16D delivers fast and reliable switching performance with microsecond-level response times. It supports both fault detection and output verification, helping engineers identify issues at the point level. Electronic fusing enhances protection by isolating faults without affecting the entire module. The 1756-OB16D also supports configurable pulse testing, allowing flexible control strategies in dynamic applications. These functions make it a strong fit for systems requiring high-speed and high-reliability output control.

From an industrial deployment perspective, the Allen-Bradley 1756-OB16D is built to maintain stable performance under demanding conditions. It supports a wide operating temperature range and high humidity tolerance, ensuring reliability in harsh environments. The 250V isolation between outputs and backplane enhances electrical safety and system stability. Its compatibility with standard terminal blocks simplifies installation and maintenance. The 1756-OB16D therefore provides a dependable solution for long-term industrial output control applications.

The 1756-OB16D Allen-Bradley ControlLogix 16 Pt 24V DC D/O Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen-Bradley 1756-OB16D ControlLogix 16 Pt 24V DC D/O Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Allen-Bradley 1756-OB16D ControlLogix 16 Pt 24V DC D/O Module Specs

General

  • Manufacturer Allen-Bradley
  • Model 1756-OB16D
  • Condition New Original ready stock
  • Product Family 1756-OB16IEF,1756-OB16IEFK,1756-OB16IEFS
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Industrial Enclosure Protection Requirements: This module is an open-type device and must be installed in an industrial control cabinet with a specific environmental protection rating to prevent conductive dust and foreign objects from entering the internal circuitry.
  • Clean and Corrosive Air: The operating environment must be clean and dry, free from high concentrations of hydrogen sulfide, chlorine, or other highly corrosive chemical gases to ensure long-term stability of electronic components.
  • Cold Start and Extreme Operation: The card operates in non-condensing environments with relative humidity ranging from 5% to 95%. Its design can withstand harsh industrial environmental fluctuations without affecting the diagnostic accuracy of internal semiconductor devices.
  • Electromagnetic Interference Shielding: The hardware structure has undergone rigorous industrial immunity testing and can operate stably in industrial environments with strong electromagnetic interference (EMI). However, it must be kept away from high-voltage power cables to avoid signal coupling.
  • Hot-Swap-Free Frame: Supports the inherent feature of the ControlLogix system—Hot-Up Plug (RIUP)—allowing direct removal or insertion of the output module without disconnecting the rack power.
  • Removable Terminal Block Interconnection: Requires the use of dedicated removable terminal blocks (RTBs), such as the 1756-TBNH (20-pin screw terminal) or 1756-TBSH (spring terminal), to ensure complete isolation between field wiring and the module.
  • Mechanical guide rail alignment and sliding: The module has precision plastic guide grooves on the top and bottom. During installation, align them with the guide rails of the rack slot and push vertically until the two plastic clips click into place.
  • Physical error-proof keying: A dedicated error-proof keying pin is included, allowing users to mechanically code the rack slot and terminal block, physically preventing the incorrect insertion of different module models into the slot during subsequent maintenance.
  • High-Reliability Solenoid Valve Actuation: Widely used in pneumatic and hydraulic solenoid valve control in chemical plants and assembly lines. Its unique short-circuit and open-circuit diagnostics ensure the flawless operation of core actuators.
  • Distributed Error-Proofing Control Cabinet: Suitable for unattended remote I/O stations. By uploading channel-level diagnostic faults to the central HMI screen in real time, it significantly reduces on-site troubleshooting and downtime for maintenance.
  • Audible and Visual Alarm System Control: Serving as the driving source for central alarms, flashing indicator lights, and buzzers in the factory, its high-density independent diagnostic capabilities ensure the high reliability of safety and warning signal paths.
  • DC Contactor Group Control: Used in conveyor belt control systems or large motor starting control cabinets to directly or indirectly drive multiple 24V DC low-power relays and contactor coils.
Description
The Allen-Bradley 1756-OB16D is a ControlLogix digital output module featuring 16 diagnostic channels operating at 24V DC source voltage. It is designed to support advanced output control with integrated diagnostic capabilities, allowing each output point to provide fault status information. The module supports a voltage operating range of 19.2 to 30V DC, making the 1756-OB16D suitable for standard industrial control power systems. With 8 points per group, it enables structured output organization within control applications.

The 1756-OB16D provides high-speed switching performance with a typical Off-to-On delay of 60 µs and a maximum of 1 ms, while the On-to-Off delay ranges from 630 µs to 5 ms. It includes electronic fusing per point, ensuring protection against overload conditions at the individual channel level. The module supports pulse testing with configurable maximum pulse width and offers ±1 ms diagnostic timestamp accuracy. These features make the Allen-Bradley 1756-OB16D suitable for applications requiring precise timing and reliable fault detection.

In terms of load handling, the 1756-OB16D supports up to 2 A per point at 30°C with linear derating to 1 A at 60°C, and up to 8 A per module under similar conditions. It also includes surge current capability of 4 A for 10 ms per point, repeatable every 1 second. Off-state leakage current is limited to 1 mA per point, while the on-state voltage drop is typically 1.2V DC at 2 A. These electrical characteristics ensure stable operation in demanding field environments where consistent output performance is required from the 1756-OB16D.

The Allen-Bradley 1756-OB16D also integrates robust system protection and communication features. It supports electronic module keying, user-defined RTB keying, and compatibility with 1756-TBCH and 1756-TBS6H terminal blocks. Isolation is rated at 250V continuous between outputs and backplane, with group-to-group isolation included for enhanced protection. The module operates within a temperature range of 0 °C to 60 °C and withstands storage conditions down to -40 °C and up to +85 °C. These environmental and structural characteristics make the 1756-OB16D suitable for long-term industrial deployment.
Revisions

Revision Part #

Also known as

1756-OB16D Ser A
1756-OB16D/A, Series A, Rev A
Alternative Names
1756-0B16D I756-08I6D I75608I6D I756-OB16D 1756-OB16DK 1756-OB16E 1756-OB16EK 1756-OB16I
Technical notes
The Allen-Bradley 1756-OB16D is a ControlLogix diagnostic output module featuring 16 individually protected 24V DC channels with a maximum current capacity of 1 A per point and 8 A per module.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How does Allen-Bradley 1756-OB16D handle output protection during overload conditions?
Allen-Bradley 1756-OB16D uses electronic fusing per point to protect outputs against overload and ensure stable operation.
What timing performance does Allen-Bradley 1756-OB16D provide for switching operations?
Allen-Bradley 1756-OB16D delivers 60 µs typical Off-to-On delay and up to 5 ms On-to-Off delay for high-speed control tasks.
Why does Allen-Bradley 1756-OB16D include diagnostic output functionality?
Allen-Bradley 1756-OB16D provides diagnostic outputs to enable per-point fault monitoring and improve system maintenance efficiency.
How does Allen-Bradley 1756-OB16D manage current limits per channel?
Allen-Bradley 1756-OB16D supports up to 2 A per point at 30°C with linear derating to 1 A at 60°C for safe operation.