Description
Product Introduction
The Allen-Bradley 1769-OW16 is a high-density 16-channel electromechanical relay output module designed for CompactLogix processors and MicroLogix 1500 controllers. It acts as an isolated switching interface between the digital logic of the controller backplane and higher-power field actuators, solenoid valves, motor starters, and indicator lamps.
Unlike solid-state output cards tied to strict DC sinking/sourcing or specific AC voltage ranges, the 1769-OW16 features dry-contact Form A (Normally Open) relays. This allows engineers to mix AC and DC loads or control varying voltage levels across isolated channel groups on the same card without adding external interposing relays.
Key Technical Specifications
| Parameter | Value |
| Outputs | 16 Digital Relay Contacts (Form A, Normally Open) |
| Operating Voltage Range | 5 to 265V AC, 5 to 125V DC |
| Continuous Current Rating | 2.5 A per point (channel dependent) |
| Module Current Max | 20 A total per module (across all common groups) |
| Minimum Load Current | 10 mA @ 5V DC |
| Contact Response Time | Turn-on: < 10 ms |
| Isolation Voltage | 240V continuous (Reinforced Insulation, Output-to-Backplane and Group-to-Group) |
| Backplane Current | 205 mA @ 5.1V DC, 100 mA @ 24V DC |
| Power Dissipation | 4.75 W |
| Power Supply Distance Rating | 8 modules (Must be installed within 8 slots of the 1769 power supply) |
Application Scenarios & The “Trench” Experience
Picture this: It’s 2:00 AM on a graveyard shift. An inductive voltage spike from an unsuppressed motor contactor coil welds the internal relay contacts on a single channel of an old 1769-OW16. The discharge valve stays permanently energized, overflowing a wash tank and dropping the entire bottling line. Slapping in a fresh 1769-OW16 and adding surge suppressors across those contactor coils gets the automated line back on schedule before the morning supervisor arrives.
- Water/Wastewater Lift Stations – Mixed-Voltage Actuation – Switches 120V AC pump contactors alongside 24V DC telemetry alarm strobes on a single compact card.
- Material Handling & Conveying – Motor Starter Control – Drives heavy-duty 120V AC magnetic starters and divert gates across high-speed sorting lanes.
- Commercial Building Automation – Lighting & Fan Arrays – Controls isolated 240V AC lighting contactors and HVAC damper solenoids across facility zones.
- Process Batching Plants – Solenoid Valve Networks – Opens and closes dry batch dump valves requiring complete electrical isolation from sensor logic grounds.
Field Case Study: A timber processing mill in Oregon had a line crash when a failed relay module stopped firing the hydraulic gate solenoids on their primary debarker. The mill was losing roughly $10,000 an hour in idle sawyer time. We pulled a fully tested 1769-OW16 from our surplus rack, verified relay contact resistances on our test bench, and hot-shot courier delivered it directly to the site. The shift electrician dropped the card in, clipped the wired terminal block back on, and had logs rolling within 4 hours.
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Allen-Bradley CompactLogix racks. Every 1769-OW16 undergoes our strict 5-stage bench verification process:
- Inbound Physical Inspection: Check housing condition, backplane bus levers, terminal block retention latches, and verify genuine Rockwell serial numbers and anti-counterfeit labels.
- Live Rig Power-On Testing: Install the module into an active 1769 chassis powered by a 1769-PA4 power supply, checking that internal bus communication initializes and status LEDs function.
- 16-Channel Contact Continuity Test: Actuate all 16 channels via Studio 5000 / RSLogix 5000. Measure contact resistance across every set of Form A contacts with a calibrated multimeter to confirm zero high-resistance or carbonized relay points.
- Group-to-Group Isolation Audit: Check dielectric isolation across isolated common channels to ensure no internal shorts or arc tracking exist between output banks.
- ESD Cleaning & Static Packaging: Clean module plastics with ESD-safe cleaning solution, seal in anti-static shielding bags, and pack securely using custom-fit foam enclosures.
1769-OW16
1769-OW16
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Do NOT Hot-Swap this Card (No RIUP)! CompactLogix 1769 I/O modules do NOT support Removal and Insertion Under Power (RIUP). Pulling or inserting a 1769-OW16 while the 1769 rack is powered will fry the backplane transceiver chips on this card and neighboring modules!
- ❗ Always Install Surge Suppressors on Inductive Loads: Electromechanical relay contacts despise inductive kickback. If you are switching solenoids, motor starters, or brake coils, wire a flyback diode (for DC loads) or an RC surge suppressor/varistor (for AC loads) directly across the field device. Without suppression, arc flash will pit the relay contacts and weld them shut within months.
- ⚠️ Mind the Total Module Current Limit: While individual contacts can handle up to 2.5A, the total current across the module must not exceed the maximum bus/common limits (20A total module rating). Grouping too many heavy inductive loads on one card will melt common traces on the internal PCB.
- ❗ Power Supply Distance Rating Check: The 1769-OW16 has a Power Supply Distance Rating of 8. It cannot sit more than 8 slots away from its 1769 power supply module (e.g., 1769-PA2, 1769-PB4). Exceeding this distance causes severe voltage drops on the 5V/24V internal bus rails, causing random coil dropouts.
Frequently Asked Questions (FAQ for Conversion)
Q: What is the difference between the 1769-OW16 and the 1769-OB16?
A: The 1769-OW16 uses physical electromechanical dry-contact relays (Form A) that can switch both AC and DC voltages. The 1769-OB16 uses solid-state transistor outputs designed strictly for 24V DC sourcing applications.
Q: Does the 1769-OW16 come with the removable terminal block?
A: Yes. Units come complete with the removable door and 18-point terminal block assembly (1769-RTBN18). If replacing an existing card, your old wired terminal block clips straight onto the new module.
Q: Can I mix AC and DC voltages on the same 1769-OW16 module?
A: Yes! The 1769-OW16 features isolated common groups (8 outputs per group, with split commons). You can switch 120V AC on one common bank and 24V DC on another common bank without electrical interference.
Q: Can I use this card with a MicroLogix 1500 controller?
A: Yes. The 1769 Compact I/O family expands both CompactLogix processors and MicroLogix 1500 base units.
Q: Why buy New Surplus from you over direct OEM distribution channels?
A: Factory lead times for standard digital relay modules can drag out during global component shortages. We maintain fully bench-tested, ready-to-ship stock that arrives at your plant fast, saving you thousands in downtime costs.
Q: What warranty comes with this relay card?
A: We back all our 1769-OW16 modules (New Surplus and Refurbished) with a comprehensive 12-month full-replacement warranty. If a relay channel fails during normal operation within a year, we ship out a replacement unit immediately.
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