Allen-Bradley 1756-OW16IK ControlLogix 16-Point Isolated Relay Output Module

Allen-Bradley 1756-OW16IK ControlLogix Isolated Relay Output Module - 16-Point Industrial Control Solution

The Allen-Bradley 1756-OW16IK represents a premium-grade relay output solution engineered for mission-critical industrial automation systems. This ControlLogix module delivers 16 individually isolated AC/DC relay outputs with conformal coating protection, making it the optimal choice for harsh manufacturing environments where electrical isolation, noise immunity, and long-term reliability are paramount.

Technical Specifications

• Output Channels: 16 individually isolated relay outputs
• Output Type: Form C (SPDT) electromechanical relays
• Voltage Rating: 5-265VAC/VDC per contact
• Current Rating: 2A continuous per output (resistive load)
• Isolation: 1500V optical isolation between backplane and field side
• Contact Life: 100,000 operations minimum at rated load
• Response Time: 10ms typical (on/off)
• Protection: Conformal coating for moisture and contaminant resistance
• Operating Temperature: 0°C to 60°C (32°F to 140°F)
• Power Consumption: 3.5W typical from backplane
• Mounting: ControlLogix chassis (1756 series)
• Diagnostic LEDs: Module status and per-channel indicators

Application Scenarios

The 1756-OW16IK excels in applications demanding galvanic isolation between control logic and field devices. Common deployments include:

• Motor Control Centers: Switching motor starters, contactors, and overload relays in multi-voltage environments where ground potential differences exist
• Process Control Systems: Actuating solenoid valves, dampers, and pneumatic actuators in chemical processing, water treatment, and pharmaceutical manufacturing
• Building Automation: Controlling HVAC equipment, lighting circuits, and access control systems across different electrical zones
• Material Handling: Operating conveyor systems, sortation gates, and diverters in distribution centers and warehouses
• Hazardous Locations: Interfacing with intrinsically safe barriers and explosion-proof equipment in oil & gas facilities
• Legacy System Integration: Bridging modern ControlLogix platforms with older relay-based control panels

Engineering Solutions

The individual channel isolation architecture eliminates ground loop issues that plague conventional output modules in electrically noisy industrial settings. Each relay contact operates independently, preventing fault propagation between circuits—a critical safety feature when controlling equipment across multiple power distribution panels.

Conformal coating extends operational lifespan in corrosive atmospheres, high-humidity environments, and areas with airborne particulates. This protective layer shields PCB traces and components from moisture ingress, chemical exposure, and conductive dust accumulation that would otherwise cause premature failure.

The module's Form C relay contacts provide both normally-open and normally-closed connections, enabling fail-safe circuit designs. Engineers can implement redundant safety interlocks, alarm annunciation, and emergency shutdown sequences without additional external components.

Diagnostic capabilities streamline troubleshooting through per-channel LED indicators and software-accessible fault data. Technicians can rapidly identify failed outputs, wiring errors, or overload conditions without multimeter testing, reducing mean time to repair (MTTR) during production downtime events.

Frequently Asked Questions

Q: Can I mix AC and DC loads on the same module?
A: Yes, each output is independently isolated and rated for both AC and DC operation. However, observe proper wiring practices—never share common terminals between AC and DC circuits, and maintain appropriate clearances per electrical codes.

Q: What happens if I exceed the 2A current rating?
A: The relay contacts will experience accelerated wear and potential welding. For loads exceeding 2A, use the module to switch an intermediate contactor or solid-state relay rated for the higher current. Always include appropriate overcurrent protection in field wiring.

Q: Is this module suitable for switching inductive loads like solenoids?
A: Yes, but inductive loads generate voltage spikes during turn-off. Install suppression devices (RC snubbers for AC, flyback diodes for DC) across the load to protect relay contacts and extend operational life. Consult Rockwell publication 1756-UM058 for suppression guidelines.

Q: How does conformal coating affect field wiring and maintenance?
A: Conformal coating is applied to internal circuitry only—terminal blocks remain uncoated for normal wire termination. The coating is transparent and doesn't interfere with visual inspection or standard maintenance procedures. It provides protection without accessibility trade-offs.

Warranty & Support

This Allen-Bradley ControlLogix relay output module is backed by a comprehensive 12-month manufacturer warranty covering defects in materials and workmanship. Our technical support team provides application engineering assistance, configuration guidance, and rapid replacement coordination to minimize production impact. All modules undergo factory testing and quality verification before shipment.

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