Allen-Bradley 1756-OW16I ControlLogix 16-Point Digital Relay Output Module | Replacement, Equivalent & Selection Guide
The Allen-Bradley 1756-OW16I is a 16-point isolated digital relay output module designed for the Rockwell Automation ControlLogix platform. Each output point is individually isolated, making it ideal for switching AC/DC loads in demanding industrial environments. This page provides full technical specifications, compatible replacement models, application guidance, and sourcing information to help engineers and procurement teams make confident decisions.
Technical Specifications
- Part Number: 1756-OW16I
- Manufacturer: Allen-Bradley / Rockwell Automation
- Platform: ControlLogix 1756 Series
- Output Type: Relay (Isolated)
- Number of Output Points: 16
- Isolation: Point-to-point isolated (each output individually isolated)
- Output Voltage Range: 10–265V AC/DC
- Maximum Load Current: 2A per point (AC); 1A per point (DC)
- Surge Current: 7.5A for 43ms (AC); 4A for 10ms (DC)
- Minimum Load Current: 10mA
- Backplane Current (5V DC): 175mA
- Backplane Current (24V DC): 2mA
- Operating Temperature: 0°C to 60°C (32°F to 140°F)
- Storage Temperature: -40°C to 85°C
- Relative Humidity: 5–95% non-condensing
- Weight: Approx. 280g
- Certifications: UL, CE, CSA, C-Tick
- Module Keying: Electronic keying supported
- Wiring: Removable terminal block (RTB), 20-pin
Compatible Replacement & Equivalent Models
When the 1756-OW16I is unavailable or cost-prohibitive, the following models may serve as functional replacements depending on your system configuration. Always verify compatibility with your specific application before substitution.
- 1756-OW16 — Non-isolated 16-point relay output; suitable if point-to-point isolation is not required. Same ControlLogix platform.
- 1756-OA16 — 16-point AC output (triac); consider if relay contact life is a concern and load is purely AC.
- 1756-OB16E — 16-point electronically fused DC output; suitable for DC-only loads requiring electronic protection.
- 1756-OW8 — 8-point isolated relay output; use when fewer points are needed with full isolation.
- 1756-OX8I — 8-point isolated relay/contact output with higher current rating (5A); suitable for high-current switching.
- Third-party equivalents: Certain WAGO, Phoenix Contact, and Beckhoff relay output modules may be used in hybrid architectures, but require gateway or protocol conversion. Contact our team for compatibility assessment.
Why Choose the Original Model
- Point-to-point isolation: Each of the 16 outputs is independently isolated, preventing fault propagation between channels — critical in safety-sensitive or mixed-voltage applications.
- Wide voltage range: Supports 10–265V AC/DC, enabling a single module to interface with diverse field devices.
- Native ControlLogix integration: Full support for RSLogix 5000 / Studio 5000 programming, electronic keying, and diagnostics.
- Proven reliability: Rockwell Automation’s relay output modules are field-proven in thousands of installations across process, discrete, and hybrid manufacturing.
- Removable terminal block: Simplifies maintenance and wiring replacement without disturbing field wiring.
Typical Applications
- Motor starter and contactor control in discrete manufacturing lines
- Valve and actuator switching in process plants (oil & gas, chemical, water treatment)
- Conveyor and material handling control systems
- HVAC and building automation control panels
- Mixed AC/DC load switching in automotive assembly
- Safety interlock and alarm output circuits
- Packaging machinery and food & beverage production lines
System Compatibility
- Compatible Chassis: All 1756 ControlLogix chassis (4, 7, 10, 13, 17-slot)
- Compatible Controllers: 1756-L6x, 1756-L7x, 1756-L8x series (ControlLogix 5560, 5570, 5580)
- Software: RSLogix 5000 v13+, Studio 5000 Logix Designer v21+
- Communication: Compatible with all ControlLogix backplane communication (EtherNet/IP, ControlNet, DeviceNet via bridge modules)
- Power Supply: Requires 1756-Pxx series ControlLogix power supply
- Not compatible with: CompactLogix (1769), MicroLogix, or SLC 500 platforms without additional hardware
Selection Guide
Use the following criteria to determine whether the 1756-OW16I is the right module for your application:
- Need isolated outputs? → Choose 1756-OW16I (isolated) over 1756-OW16 (non-isolated)
- Load voltage AC or DC mixed? → 1756-OW16I supports both; triac/transistor modules do not
- High switching frequency? → Relay contacts have mechanical life limits (~1M operations); consider solid-state alternatives for high-cycle applications
- Load current > 2A per point? → Consider 1756-OX8I (5A/point) or external relay amplification
- Fewer than 16 points needed? → 1756-OW8 (8-point isolated) may reduce cost
- Safety application (SIL-rated)? → Consult Rockwell’s safety module portfolio (1756-OBxxS series)
Quality Assurance & Sourcing
- Source: Konmask.com sources 1756-OW16I modules from authorized distributors and verified secondary market suppliers with full traceability.
- Inspection: All modules undergo visual inspection, label verification, and functional testing prior to shipment.
- Warranty: 12-month warranty against manufacturing defects. Replacement or refund guaranteed.
- Authenticity: We do not sell counterfeit or remarked parts. Certificate of conformance available upon request.
- Lead Time: In-stock units ship within 1–3 business days. Contact us for urgent requirements.
How to Order
- Confirm your ControlLogix chassis slot availability and power budget.
- Verify the required output voltage range and current per point.
- Select quantity and add to cart, or contact us for volume pricing.
- Provide your PO number, shipping address, and any special requirements at checkout.
- For OEM or project orders (>5 units), email [email protected] for a formal quotation.
Replacement & Compatibility FAQ
Q: Can I replace 1756-OW16I with 1756-OW16 without changing my program?
A: Yes, in most cases. The non-isolated version uses the same I/O addressing. However, verify that your field wiring does not rely on point-to-point isolation before substituting.
Q: Is the 1756-OW16I compatible with ControlLogix 5580 (L8x) controllers?
A: Yes. The module is compatible with all ControlLogix generations including the latest 5580 series when used with Studio 5000 v21+.
Q: What is the relay contact life expectancy?
A: Rated at approximately 1,000,000 mechanical operations and 100,000 electrical operations at rated load. Actual life depends on load type and switching frequency.
Q: Can this module be used in a SIL 2 safety application?
A: The 1756-OW16I is not a safety-rated module. For SIL-rated applications, use Rockwell’s GuardLogix safety I/O modules.
Q: Do you provide datasheets or wiring diagrams?
A: Yes. Contact [email protected] and we will provide the official Rockwell Automation technical documentation.
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