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        Allen-Bradley 1791D-0B8P
        Allen-Bradley 1791D-0B8P
        Allen-Bradley 1791D-0B8P
        Allen-Bradley 1791D-0B8P
        Allen-Bradley 1791D-0B8P
        Allen-Bradley 1791D-0B8P
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        1791D-0B8P

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        The 1791D-0B8P is a CompactBlock 8 source output base module designed for industrial automation applications that require compact distributed I/O solutions.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 1791D-0B8P

        • Manufacturer:
          Allen-Bradley
        • Part Number:
          1791D-0B8P
        • Product Family:
          1791 Block I/O
        • Outputs per Block:
          8
        • On-state Voltage Range:
          10 - 30V dc
        • On-state Voltage Drop:
          0.5V dc @ rated current
        • On-state Current:
          0.5A maximum
        • Off-state Leakage:
          1.0mA maximum
        • Module Current (all outputs):
          4.0A maximum
        • Surge Current - for 10ms,repeatable every 2 s:
          1.0A maximum
        • Weight:
          0.18 kg
        • Estimated shipping dimensions:
          14.7x5.2x3.8cm
        • Tariff Code:
          8537101190
        • 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 Use Cases Certifications & Standards Firmware & Updates

        Features:

        • Interface Between DeviceNet Network and 8 Sourcing Output Channels
        • Combines Capability of Digital Output Control with Distributed I/O Architecture
        • Operates in Conjunction with Master Scanners and Expansion I/O Modules
        The Allen-Bradley 1791D-0B8P 8 sourcing output base module operates as a CompactBlock I/O solution in DeviceNet networks, providing reliable digital output control for industrial automation applications. It continuously exchanges I/O data with the master through polled, change-of-state, or cyclic connections and distributes sourcing output signals to control solenoids, relays, and other field devices. Seamless communication is standard with the 1791D-0B8P, however using an optional expansion module configuration will allow seamless integration of additional I/O points while monitoring expansion health status. The 1791D-0B8P has made improvements in several areas over traditional centralized I/O designs in addition to incorporating built-in power supply and DeviceNet adapter capability within the compact block.

        The 1791D-0B8P provides essential output functions for distributed control systems, and is a critical component of the I/O path, directly affecting the proper, normal operation of field actuators and indicators. One 1791D-0B8P base module is required per output node, with support for expansion modules to increase I/O density. The 1791D-0B8P occupies minimal installation space and is always positioned close to sensors and actuators for reduced wiring complexity.

        For expanded I/O applications, the 1791D-0B8P supports connection of additional CompactBlock expansion modules. In addition to standard standalone operation, the expansion configuration also performs automatic health monitoring. The 1791D-0B8P expansion system executes status reporting using the internal byte returned indicating expansion module health. Using this method, the base module continually monitors the status of connected expansions. If the system detects that the expansion module is no longer operating within normal parameters, it will automatically report this condition through the DeviceNet network and update the health indication byte.

        The 1791D-0B8P Allen-Bradley 8 sourcing output base module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Allen-Bradley 1791D-0B8P 8 sourcing output base 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 1791D-0B8P 8 sourcing output base module Specs

        General

        • Manufacturer Allen-Bradley
        • Model 1791D-0B8P
        • Condition New Original ready stock
        • Product Family 1791D-0B16P,1791D-8B8P,1791D-8V8P
        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.
        • Space-Constrained Installations: Its compact design allows it to fit into shallow enclosures and confined areas where traditional modular racks cannot.
        • Distributed Actuator Control: Ideal for mounting directly onto machines to control up to 8 DC actuators (solenoids, relays, or indicator lights) while communicating back to a master PLC/SLC over DeviceNet.
        • Expanded I/O Systems: While it has 8 outputs on its own, it can act as a base for expansion modules, supporting up to 24 total outputs or a mix of 8 outputs and 16 inputs.
        • Localized Control: DeviceLogix technology within the base block allows for simple, localized logic functions, which can speed up sense-to-actuation time.
        • Safety Certifications: UL, c-UL-us (Class I, Division 2 Hazardous Locations), and CE marked for all applicable directives.
        • Network Compatibility: ODVA certified for DeviceNet communication.
        • Environmental Protection: IP20 rated enclosure, suitable for Pollution Degree 2 industrial environments.
        • Quality Standards: C-Tick certified for electromagnetic compatibility (EMC).
        • Revision Levels: Modules are shipped with factory-installed firmware; for example, Series D units have been seen with Firmware Rev 3.002.
        • Configuration Tools: Parameters and firmware-related settings are typically managed via RSNetWorx for DeviceNet or similar Rockwell configuration software.
        View as PDF
        Description
        The 1791D-0B8P is a CompactBlock 8 sourcing output base module designed for industrial automation applications requiring compact, distributed I/O solutions. This module integrates I/O circuits, a built-in power supply, and a built-in DeviceNet I/O adapter into a single compact unit, making the 1791D-0B8P ideal for space-constrained installations and applications demanding highly distributed I/O blocks positioned close to sensors and actuators.

        The 1791D-0B8P supports multiple communication methods including polled, change-of-state, and cyclic connections, enabling flexible integration with various master controllers. In polled mode, the 1791D-0B8P consumes messages from the master, updates outputs, and produces responses containing input data. For change-of-state operation, the 1791D-0B8P initiates production when inputs change, with heartbeat productions ensuring communication integrity when no changes occur. The cyclic mode allows the 1791D-0B8P to function as an I/O client, producing and consuming data at configured rates. The 1791D-0B8P consumes 1 byte for every 8 outputs, and when expansion modules are connected, the 1791D-0B8P returns an additional byte indicating the health status of the expansion module.

        This 1791D-0B8P 8 sourcing output base module is specifically designed to address the challenges of limited installation space and the need for distributed control architectures. The 1791D-0B8P solves the problem of wiring complexity and long cable runs by enabling I/O blocks to be placed directly near field devices, reducing installation costs and improving signal integrity. In manufacturing environments such as automotive assembly lines, packaging machinery, and material handling systems, the 1791D-0B8P provides reliable digital output control for solenoids, relays, and other sourcing-type loads. 

        The 1791D-0B8P eliminates the need for separate power supplies and communication adapters, streamlining panel design and reducing hardware footprint. For applications requiring rapid response to input changes, the 1791D-0B8P's change-of-state capability ensures efficient network bandwidth utilization while maintaining real-time monitoring of critical processes. The 1791D-0B8P also supports system expansion through additional modules, with built-in health monitoring that enhances predictive maintenance capabilities and system reliability.
        Revisions

        Revision Part #

        Also known as

        1791D-0B8P Ser A
        1791D-0B8P/A, Series A, Rev A
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        1791D-0B8P Ser B
        1791D-0B8P/B, Series B, Rev B
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        1791D-0B8P Ser C
        1791D-0B8P/C, Series C, Rev C
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        Alternative Names
        1791D-4B0 1791D-4B4P 1791D-8B8P 1791D-8V8P 1791D-16B0 1791D-0B16P
        Technical notes
        The Allen‑Bradley 1791D‑0B8P is a DeviceNet CompactBlock I/O base module with 8 source DC outputs, integrated power and communication, and short‑circuit protection. It supports expansion via a 16‑point extension module (input or output), consumes 125 mA typical from DeviceNet, operates on 10–30V DC, and is rated IP20 with UL/CE certifications. Use RSLogix 5000 or RSNetWorx for configuration; refer to official publication 1791D‑IN001 for final design.
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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.
        VIEW ALL FAQS
        What is the 1791D-0B8P module?
        The 1791D-0B8P is a CompactBlock 8 sourcing output base module designed for industrial automation systems that require compact and distributed I/O solutions. It integrates I/O circuits, a built-in power supply, and a DeviceNet I/O adapter into a single unit, making it highly suitable for installations with limited space.
        What are the key features of the 1791D-0B8P?
        The module combines multiple functions into one compact device, reducing the need for additional hardware. It supports distributed I/O architecture, allows installation close to field devices, and simplifies system design by eliminating separate power supplies and communication adapters.
        In which applications is the 1791D-0B8P commonly used?
        The module is widely used in industrial environments such as automotive assembly lines, packaging machinery, and material handling systems, where reliable digital output control is required for devices like solenoids and relays.

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