Discrete Output Control Solution – Allen-Bradley 1791-OB16 | Block I/O Series
Where This Product Is Used
The Allen-Bradley 1791-OB16 Block I/O Output Module is engineered for demanding industrial environments where reliable discrete output control is non-negotiable. Engineers and system integrators specify this module across a wide range of applications:
- Automotive Assembly Lines – Controlling solenoid valves, actuators, and conveyor drives in high-cycle body-in-white and powertrain assembly cells.
- Food & Beverage Processing – Driving pneumatic valves, pumps, and agitators in hygienic production environments with strict uptime requirements.
- Material Handling & Packaging – Interfacing with sorters, diverters, and reject mechanisms in high-speed packaging lines.
- Water & Wastewater Treatment – Activating pump starters, valve actuators, and alarm outputs in remote pump stations.
- Oil & Gas Wellhead Control – Switching field devices in hazardous-area panels where compact block I/O reduces wiring complexity.
- Machine Tool & CNC – Controlling coolant pumps, tool changers, and safety interlocks in precision machining centers.
- Building Automation & HVAC – Managing damper actuators, fan starters, and lighting contactors in distributed control panels.
Technical Specifications
| Parameter | Specification |
|---|---|
| Part Number | 1791-OB16 |
| Series | Allen-Bradley Block I/O |
| Output Type | Discrete Solid-State DC Output |
| Number of Outputs | 16 Points |
| Output Voltage Range | 10–30V DC |
| Output Current per Point | 0.5 A (max) |
| Total Module Current | 4 A (max, all outputs ON) |
| Output Logic | Sourcing (PNP) |
| Communication Interface | Allen-Bradley 1791 Block I/O Bus |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5–95% (non-condensing) |
| Enclosure Rating | IP20 (panel-mount) |
| Power Consumption | Refer to OEM datasheet |
| Weight | 500 g (approx.) |
| Certifications | UL, CE, CSA |
Why Engineers Specify This Model
- Compact Block Architecture – Integrates I/O directly at the machine, eliminating long wire runs back to a central rack and reducing installation cost by up to 40%.
- 16-Point Density – High channel count in a single module minimizes panel footprint and simplifies cable management in space-constrained enclosures.
- Solid-State Outputs – No mechanical contacts to wear out; rated for millions of switching cycles, dramatically extending MTBF in high-cycle applications.
- Sourcing (PNP) Output Logic – Compatible with the majority of industrial sensors and actuators used in North American and Asian markets.
- Seamless Rockwell Ecosystem Integration – Plug-and-play with Allen-Bradley PLC-5, SLC 500, and ControlLogix systems via the 1791 adapter interface.
- Rugged Industrial Design – Vibration and shock-resistant construction meets the demands of heavy manufacturing environments.
- Proven Field Reliability – The 1791 Block I/O platform has decades of installed base across global manufacturing facilities.
Complete System Bill of Materials
For a fully operational Block I/O output control node, the following components are typically required:
- 1791-OB16 – Block I/O 16-Point DC Output Module (this item)
- 1791-A10 or 1791-A2 – Block I/O Adapter (for SLC 500 or PLC-5 backplane connection)
- 1791-CBL-PM02 – Adapter-to-Module Interconnect Cable
- 1791-TB32 – Terminal Block Assembly (field wiring termination)
- 24V DC Power Supply – Suitable for field device power (e.g., Allen-Bradley 1606-XLP series)
- DIN Rail & Panel Hardware – For module mounting and enclosure installation
- Shielded Field Wiring – 18–22 AWG, per Rockwell Automation wiring guidelines
Contact Konmask.com for bundle pricing on complete Block I/O system assemblies.
Compliance & Industry Standards
- UL Listed – Underwriters Laboratories certification for North American market compliance.
- CE Marked – Conforms to EU Low Voltage Directive (LVD) and EMC Directive requirements.
- CSA Certified – Canadian Standards Association approval for Canadian installations.
- RoHS Compliant – Restriction of Hazardous Substances directive compliance.
- IEC 61131-2 – Programmable controller equipment standard for I/O module performance.
- NFPA 79 – Electrical Standard for Industrial Machinery (applicable installation guidance).
Quality Assurance & Sourcing
Konmask.com specializes in the procurement and supply of industrial automation components for B2B customers worldwide. Every 1791-OB16 unit we supply undergoes the following quality process:
- Source Verification – Units are sourced from authorized distributors, certified resellers, or directly from Rockwell Automation-approved supply chains.
- Visual & Physical Inspection – Each module is inspected for label integrity, connector condition, housing damage, and counterfeit indicators prior to dispatch.
- Functional Testing (where applicable) – Refurbished or surplus units are bench-tested against OEM specifications before listing.
- Traceability Documentation – Lot codes, date codes, and sourcing records are maintained for full supply chain traceability.
- Secure Packaging – Anti-static packaging with foam cushioning ensures safe transit to your facility.
How to Source This Part
- Add to Cart – Click the purchase button above to place your order directly on Konmask.com.
- Request a Quote – For volume orders (5+ units), OEM projects, or urgent requirements, email support@konmask.com for a dedicated quote within 24 hours.
- Verify Compatibility – Share your existing system architecture (PLC model, adapter type, firmware revision) and our technical team will confirm compatibility before shipment.
- Lead Time – In-stock units ship within 1–3 business days. Out-of-stock items are sourced on request; typical lead time 7–21 business days depending on availability.
- International Shipping – We ship globally via DHL, FedEx, and UPS with full customs documentation support.
Application-Specific FAQ
Q: Is the 1791-OB16 compatible with ControlLogix systems?
A: The 1791 Block I/O series interfaces with ControlLogix via a 1791 adapter module (e.g., 1791-A2 or equivalent). Direct backplane connection to ControlLogix is not supported; an adapter is required.
Q: Can this module be used in a Class I, Division 2 hazardous location?
A: The standard 1791-OB16 is not rated for Class I, Div 2 environments. For hazardous locations, consult Rockwell Automation for ATEX/IECEx-rated alternatives or use appropriate barriers.
Q: What is the maximum cable length between the adapter and the 1791-OB16?
A: Rockwell Automation specifies a maximum interconnect cable length of 30 meters (100 ft) using the 1791-CBL series cables. Exceeding this may cause communication errors.
Q: Can I mix input and output modules on the same Block I/O network?
A: Yes. The 1791 Block I/O platform supports mixed input/output module configurations on the same adapter network, subject to the adapter’s total I/O point capacity.
Q: Do you supply the OEM programming manual and wiring diagrams?
A: Yes. Upon request, we can provide links to the official Rockwell Automation publication (1791-6.5.1) or assist with locating the relevant technical documentation.
Q: What warranty applies to this module?
A: Konmask.com provides a 90-day functional warranty on all tested surplus units. New/sealed units carry the original OEM warranty. Contact us for full warranty terms.
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