Allen-Bradley 1794-OB16 Flex 16-Point Digital Output Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1794-OB16 is a 16-point 24 VDC sourcing digital output module designed for the Flex I/O platform. It delivers reliable, high-density discrete control for machine automation, process control, and distributed I/O architectures. Whether you are maintaining an existing system, sourcing a replacement, or evaluating equivalent alternatives, this guide provides the technical depth and selection clarity you need.
Technical Specifications
- Catalog Number: 1794-OB16
- Series: Allen-Bradley Flex I/O
- Output Points: 16 (sourcing, DC)
- Output Voltage: 24 VDC
- Output Current: 0.5 A per point (max)
- Total Module Current: 4 A max (all points on)
- On-State Voltage Drop: ≤ 1.0 V
- Off-State Leakage Current: ≤ 1.0 mA
- Backplane Current (5 VDC): 75 mA
- Backplane Current (24 VDC): 2 mA
- Operating Temperature: 0 °C to 55 °C
- Storage Temperature: -40 °C to 85 °C
- Relative Humidity: 5% to 95% (non-condensing)
- Isolation: 500 VAC continuous (field side to backplane)
- Wiring: Removable terminal block (RTB)
- Certifications: UL, CE, CSA
- Dimensions (H × W × D): 94 × 23 × 87 mm (approx.)
- Weight: Approx. 100 g
Compatible Replacement & Equivalent Models
When the 1794-OB16 is unavailable or end-of-life in your region, the following models offer functional equivalence or direct drop-in replacement capability:
- 1794-OB16D — Diagnostic version with per-point fault detection; same form factor and wiring
- 1794-OB8 — 8-point sourcing output; use two modules to replicate 16-point capacity
- 1794-OB8EP — 8-point electronically protected output; enhanced short-circuit protection
- 1794-OB32 — 32-point high-density output; suitable when I/O expansion is planned
- 1756-OB16I (ControlLogix) — Platform upgrade path; isolated 16-point output for ControlLogix chassis
- 1769-OB16 (CompactLogix) — Compact I/O equivalent; suitable for smaller panel footprints
- Siemens 6ES7 322-1BH01-0AA0 — Third-party equivalent (SM 322, 16 DO × 24 VDC/0.5 A); requires adapter wiring
- Beckhoff KL2408 — Bus terminal 8-channel DO; pair two for 16-point equivalent in EtherCAT systems
Note: Always verify backplane compatibility, firmware revision, and terminal block type before substituting modules in a live system.
Why Choose the Original Model
- Proven Platform Stability: The 1794-OB16 has been deployed in thousands of industrial installations worldwide with a documented reliability record.
- Native ControlLogix / SoftLogix Integration: Seamless tag-based addressing via RSLogix 5000 / Studio 5000 with no additional configuration overhead.
- Removable Terminal Block (RTB): Enables module hot-swap without rewiring, minimizing downtime during maintenance.
- Rockwell Ecosystem Support: Full support through FactoryTalk, RSLinx, and Rockwell TechConnect — critical for regulated industries.
- Long-term Spare Parts Availability: Konmask.com maintains stock of both new and refurbished 1794-OB16 units to support legacy system longevity.
Typical Applications
- Solenoid valve control in pneumatic and hydraulic systems
- Motor starter and contactor switching
- Conveyor and material handling line control
- Indicator lamp and alarm annunciator driving
- Distributed I/O nodes in large-scale process plants
- Packaging machinery and filling line automation
- Water treatment and HVAC control panels
System Compatibility
- Backplane: 1794-TB3, 1794-TB3S, 1794-TB32, 1794-TB32S terminal bases
- Adapters: 1794-AENT (EtherNet/IP), 1794-ADN (DeviceNet), 1794-APB (PROFIBUS), 1794-ACN15 (ControlNet)
- Controllers: ControlLogix (1756), CompactLogix (1769), SoftLogix 5800, PLC-5 (via adapter)
- Software: RSLogix 5000 / Studio 5000 v16+, RSNetWorx, FactoryTalk View
- Firmware: Compatible with Series A and Series B hardware revisions
Selection Guide
Use the following criteria to confirm the 1794-OB16 is the right module for your application, or to identify the best alternative:
- Point Count: If you need exactly 16 discrete outputs at 24 VDC sourcing, the 1794-OB16 is the primary choice. For 8 points, consider 1794-OB8; for 32 points, consider 1794-OB32.
- Current per Point: Standard loads up to 0.5 A per point are supported. For higher-current loads (up to 2 A), evaluate 1794-OB8EP or ControlLogix isolated output modules.
- Diagnostics Requirement: If per-point fault detection is required by your safety or maintenance standard, select 1794-OB16D instead.
- Network Protocol: Match the adapter to your network — EtherNet/IP (1794-AENT), DeviceNet (1794-ADN), or PROFIBUS (1794-APB).
- Environment: For ambient temperatures above 55 °C or high-vibration environments, consult Rockwell’s extended-environment product line.
- Budget vs. OEM: Refurbished 1794-OB16 units from Konmask.com offer a cost-effective path for non-critical or backup applications with full functional testing.
Quality Assurance & Sourcing
- New OEM Units: Factory-sealed, full Rockwell Automation warranty, traceable lot codes.
- Refurbished / Tested Units: Fully functional tested, cleaned, and inspected; supplied with a Konmask.com 90-day warranty.
- Counterfeit Prevention: All units sourced through verified supply chains. Holographic labels, date codes, and PCB markings are inspected prior to shipment.
- Export Compliance: EAR99 classification; export documentation available upon request for international orders.
- Lead Time: In-stock units ship within 1–3 business days. Contact us for volume pricing and blanket order arrangements.
How to Order
- Online: Add to cart directly from this page. Secure checkout with bank transfer, PayPal, and major credit cards accepted.
- Email RFQ: Send your BOM or part list to support@konmask.com for a formal quotation within 24 hours.
- Phone / WhatsApp: +0086 19859288691 — available Monday to Saturday, 09:00–18:00 CST.
- Minimum Order: 1 piece. Volume discounts available for orders of 5+ units.
- Shipping: DHL, FedEx, UPS international express; domestic China logistics via SF Express or JD Logistics.
Replacement & Compatibility FAQ
Q: Can I replace a 1794-OB16 with a 1794-OB16D without changing the program?
A: Yes. The 1794-OB16D is a drop-in hardware replacement. You will need to update the I/O configuration in Studio 5000 to enable diagnostic tags, but existing output logic remains unchanged.
Q: Is the 1794-OB16 compatible with a 1794-AENT adapter on EtherNet/IP?
A: Yes. The 1794-OB16 is fully compatible with the 1794-AENT adapter. Ensure the adapter firmware is v4.001 or later for optimal performance.
Q: Can I mix 1794-OB16 and 1794-IB16 modules on the same terminal base bank?
A: Yes. Flex I/O supports mixed input/output modules on the same adapter, subject to backplane current budget constraints.
Q: What is the difference between Series A and Series B of the 1794-OB16?
A: Series B introduced minor PCB revisions for improved EMC performance. Both series are functionally identical and interchangeable in most applications.
Q: Do you provide a certificate of conformance (CoC) or test report?
A: Yes. A CoC is available for new OEM units. Functional test reports are available for refurbished units upon request.
Q: Can Konmask.com supply the matching terminal base (1794-TB3)?
A: Yes. We stock the full range of 1794 terminal bases and adapters. Contact us to bundle your order.
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Original Source: https://Konmask.com
Contact: support@konmask.com | +0086 19859288691
