1769-OB16 Allen-Bradley CompactLogix 24VDC 16-Point Output

Overview

The 1769-OB16 is a high-density, 16-point solid-state digital output module engineered by Rockwell Automation for the Allen-Bradley CompactLogix and MicroLogix 1500 systems. Designed for demanding industrial control environments, this single-slot expansion module delivers fast switching capability and robust signal driving for 24V DC field actuators.

Operating across a voltage envelope of 20.4 to 26.4V DC, the 1769-OB16 channels current up to 1.0 A per point at 30 °C (0.5 A at 60 °C), reaching a total module output capacity of 8.0 A. High-speed optical isolation yields rapid signal response times—0.1 ms turn-on and 1.0 ms turn-off—ensuring precise real-time actuation of automated machinery.

Technical Specifications

The engineering specifications below present hardware parameters systematically using MECE classification rules for seamless technical auditing.

• Brand: Allen-Bradley / Rockwell Automation
• Catalog Number: 1769-OB16
• Product Series: CompactLogix / Compact I/O Family
• Module Type: Solid-State DC Digital Output Module
• Number of Outputs: 16 sourcing outputs (arranged in 1 single group)
• Nominal Operating Voltage: 24V DC source (category)
• Operating Voltage Range: 20.4 to 26.4V DC
• Current Rating per Point: 1.0 A @ 30 °C (86 °F) / 0.5 A @ 60 °C (140 °F)
• Total Module Current Limit: 8.0 A @ 30 °C / 4.0 A @ 60 °C
• Surge Current Capacity: 2.0 A for 10 ms (repeatable every 2 seconds)
• Output Response Time: On delay = 0.1 ms / Off delay = 1.0 ms
• Maximum On-State Voltage Drop: 1.0V DC at 1.0 A
• Off-State Leakage Current: 1.0 mA maximum at 26.4V DC
• Backplane Current Draw: 200 mA at 5.1V DC
• Power Supply Distance Rating: 8 modules from power supply
• Heat Dissipation: 2.11 Watts total
• Isolation Insulation: IEC Class 2 reinforced (75V DC continuous isolation)
• Terminal Block Part Number: 1769-RTBN18 (18-pin removable screw terminal)
• Field Conductor Sizing: 22 to 14 AWG solid / 22 to 16 AWG stranded copper
• Mounting Hardware: 35 mm DIN rail or panel mount using M4 / #8 screws
• Physical Dimensions: 118 x 35 x 87 mm (4.65 x 1.38 x 3.43 in)
• Operating Environment: 0 to 60 °C (32 to 140 °F); 5% to 95% non-condensing humidity; 30G operating shock
• Industry Identification: UPC 10662468992869 and UNSPSC 32151705

Installation & Airflow Standards

Adhering to proper mechanical mounting procedures prevents thermal buildup and backplane communication glitches.

• Always disconnect main system power before seating or removing the 1769-OB16 module from the assembly.
• Verify the unit resides within its 8-module Power Supply Distance Rating relative to 1769-PA2, 1769-PB2, 1769-PA4, or 1769-PB4 supplies.
• Mount the unit on a standard 35 mm DIN rail or secure it to a backpanel using M4 or #8 panhead screws.
• Maintain a minimum clearance of 2 inches (50 mm) above and below the housing to ensure adequate convective air cooling.
• When connecting to a MicroLogix 1500 system, attach the expansion ribbon cable directly to the base processor header.
• Wire field devices to the 1769-RTBN18 removable terminal block using 22 to 14 AWG solid or 22 to 16 AWG stranded conductors.

Operational Diagnostics & Circuit Limits

The 1769-OB16 contains dedicated hardware safeguards designed to isolate control logic from hazardous industrial field conditions.

Optical isolation rated to 75V DC prevents ground potential differences between field field wiring and the local controller backplane. Embedded status LEDs provide real-time channel visual verification, while transient surge protection handles inductive kickback currents up to 2.0 A for 10 ms during heavy solenoid switching cycles.

Target Equipment & Field Applications

Controls engineers specify the 1769-OB16 across discrete manufacturing networks requiring high-density 24V DC switching capacity.

Typical target equipment includes pneumatically actuated directional valves, pilot solenoids, DC relay coils, indicator towers, and digital input cards on VFD drives. Interposing relays allow the module to command high-voltage AC loads up to 120/240V AC safely without exposing the module to AC transients.

Global PLC Spare HUB's Insight & Field Experience

Our automation engineering team tests and deploys hundreds of CompactLogix hardware components in active production facilities. The 1769-OB16 is exceptionally durable, but installation details matter significantly when driving inductive loads.

During a field call at a high-speed packaging plant, an engineer reported recurring channel failures on a 1769 output card driving un-suppressed DC solenoid valves. The back-EMF voltage spikes generated during rapid coil de-energization exceeded the thermal limits of the internal switching transistors over time. Installing flyback diodes across all inductive DC loads completely eliminated the inductive transients and restored long-term reliability. We strongly advise fitting external surge suppressors on all solenoid and relay coils wired to solid-state DC modules.

System Selection & Integration Guidance

Calculating overall current draw and power distribution prevents unexpected system shutdowns in fully populated I/O racks.

Ensure your total 24V DC power supply can deliver 8.0 A when all 16 output points energize simultaneously at maximum rated load. If your control architecture requires AC output control directly without interposing relays, select the 1769-OA16 module instead. Always verify that total module placement stays within 8 slots of the system power supply to avoid backplane voltage drop.

Shipping Terms & 12-Month Warranty Coverage

Every module ships in static-shielding antistatic packaging inside a reinforced box lined with custom impact foam.

We back each 1769-OB16 module with a 12-month hardware warranty covering component reliability and operational performance. Fast-track orders process rapidly, shipping within 24 to 48 hours via top tier express couriers including FedEx, UPS, or DHL.

Frequently Asked Questions (FAQ)

What is the maximum allowable cable distance from the power supply for the 1769-OB16?

The module features a Power Supply Distance Rating of 8, meaning it cannot be installed more than 8 module slots away from the system power supply.

Can the 1769-OB16 directly switch 120V AC or 240V AC loads?

No, this unit is designed strictly for 24V DC sourcing operations. However, it can control AC loads indirectly by driving 24V DC interposing relay coils.

Does the module package include a field wiring connector?

Yes, each unit kit ships complete with an 18-pin 1769-RTBN18 removable screw terminal block for easy field wiring termination.

How does ambient operating temperature affect the maximum current per point?

At temperatures up to 30 °C (86 °F), each point handles up to 1.0 A. At maximum operating temperature of 60 °C (140 °F), current derates to 0.5 A per point.

What express carrier options are used for dispatching orders?

All orders process rapidly and ship within 24 to 48 hours utilizing global express services such as FedEx, UPS, or DHL.

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