Description
Product Introduction
The Allen-Bradley 1769-IQ16 is a 16-channel 24V DC digital input card engineered for CompactLogix processors and MicroLogix 1500 controllers. It interface-bridges standard discrete sensors—such as pushbuttons, limit switches, proximity sensors, and photoelectric eyes—straight to your control system logic.
With two distinct isolated input groups of 8 channels each, the 1769-IQ16 accommodates both sinking and sourcing field wiring configurations. Onboard hardware filtering rejects electrical noise and contact bounce, ensuring smooth digital signal transitions into the controller memory without false register trips.
Key Technical Specifications
| Parameter | Value |
| Inputs | 16 Digital (2 groups of 8) |
| Voltage Category | 24V DC Sink/Source |
| Operating Voltage Range | 10 to 30V DC @ 30 °C (10 to 26.4V DC @ 60 °C) |
| Off-State Voltage (Max) | 5V DC |
| On-State Voltage (Min) | 10V DC |
| On-State Current (Min) | 2.0 mA @ 10V DC |
| Nominal Input Current | 8 mA @ 24V DC |
| Hardware Hardware Filter Time | Off-to-On: 8 ms typical |
| Backplane Current | 115 mA @ 5.1V DC, 0 mA @ 24V DC |
| Power Dissipation | 2.55 W |
| Power Supply Distance Rating | 8 modules (Must be within 8 slots of the 1769 power supply) |
| Isolation Voltage | 75V continuous (Basic Insulation, Group-to-Group & Group-to-Backplane) |
Application Scenarios & The “Trench” Experience
It’s 10 PM on a Friday. A conveyor jam triggers a physical crash on a palletizer, smashing a conduit junction box and dumping 120V shorting voltage into a 24V DC input cable. The resulting surge fries an entire bank of digital inputs on a 1769-IQ16, leaving 12 limit switches unresponsive. The line halts, holding up five trailing packaging bays. Swapping out the fried module for a fresh unit gets those safety limits talking to the CompactLogix CPU again so the line can clear and restart.
- Automotive Assembly Cells – Fixture Clamping Status – Monitored proximity sensors verify part placement and clamp engagement before welding robots cycle.
- Food & Beverage Conveying – Photoeye Bottle Tracking – Detects container backups, lane shifts, and gate positions on high-density filling lines.
- Commercial Stamping & Pressing – Guard Door Safety Interlocks – Reads mechanical limit switch contacts across machine enclosures to ensure operator interlocks are closed.
- Water Treatment Control Panels – Float Level Switches – Captures discrete high-level/low-level tank alarms to cycle sump pumps on demand.
Field Case Study: A pharmaceutical packaging line in Illinois encountered intermittent sensor dropouts on a bottle cartoning machine. The shift electrician spent hours troubleshooting ghost faults caused by a damaged terminal connector on a legacy input card. We dispatched a bench-tested 1769-IQ16 via courier. The site technician snapped in the new module, wired the existing terminal block, and restored 100% signal integrity before the morning shift started.
Transparency SOP: Quality Assurance & Testing
We don’t just ship boxes; we test them on actual Allen-Bradley CompactLogix racks. Every 1769-IQ16 undergoes our strict 5-stage bench verification process:
- Inbound Physical Inspection: Inspect housing tabs, terminal block retention points, backplane bus levers, and confirm genuine Allen-Bradley serial numbers.
- Live Rig Power-On Testing: Seat the module into a 1769 chassis powered by a 1769-PA4 power supply to verify backplane bus communications and power LED status.
- 16-Channel Point-by-Point Test: Apply 24V DC to every individual input terminal (Channels 0–15). Verify channel LED indicators illuminate and check real-time bit status changes inside RSLogix 5000 / Studio 5000 controller tags.
- Group Isolation Test: Check electrical isolation across Group 0 and Group 1 commons to confirm zero cross-channel leakage or internal shorting.
- ESD Cleaning & Static Packaging: Clean outer plastic with anti-static solution, enclose in static-shielding bags, and package using custom-fit protective foam.
1769-IQ16
1769-IQ16
The Veteran’s Tech Trap Guide (Crucial Value-Add)
- ⚠️ Do NOT Hot-Swap this Module (No RIUP)! CompactLogix 1769 I/O cards do NOT support Removal and Insertion Under Power (RIUP). If you pull or plug in a 1769-IQ16 while the rack is powered, you risk destroying the backplane communication chips on this card and adjacent modules!
- ❗ Mind the Power Supply Distance Rating: The 1769-IQ16 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-PA4). Placing it in slot 9 or beyond causes power drops and intermittent backplane bus faults.
- ⚠️ Sink vs. Source Common Wiring: The 1769-IQ16 supports both sinking and sourcing inputs, but channels are grouped in sets of 8 (Group 0: IN0–7, Group 1: IN8–15). If you tie the common terminal (
COM0) to 24V DC (-), all 8 inputs in that group must be wired for sourcing. Mixing PNP and NPN devices on the same common group won’t work! - ❗ Terminal Block Lever Latches: When reinstalling the removable terminal block, make sure the top and bottom orange locking latches click firmly. A loose terminal block causes intermittent input drops that will drive your technicians crazy during vibration-heavy machine cycles.
Frequently Asked Questions (FAQ for Conversion)
Q: Can I use 12V DC input signals with the 1769-IQ16?
A: No. The minimum On-State voltage for the 1769-IQ16 is 10V DC, but it is optimized for standard 24V DC nominal control circuits. For 5V or 12V specific applications, review alternative TTL or lower-voltage input modules.
Q: Does the 1769-IQ16 come with the removable terminal block?
A: Yes, standard replacement units include the removable door and terminal block assembly (1769-RTBN18). If you are replacing an existing card, your old wired terminal block clips right onto the new module.
Q: What is the difference between the 1769-IQ16 and the 1769-IQ32?
A: The 1769-IQ16 provides 16 input channels with screw-terminal connections. The 1769-IQ32 provides 32 high-density input channels but requires a 40-pin ribbon cable harness or a D-shell breakout cable system (such as Allen-Bradley 1492 interface modules) rather than individual screw terminals.
Q: Can I use the 1769-IQ16 with a MicroLogix 1500 controller?
A: Yes. The 1769 Compact I/O expansion system works with both CompactLogix controllers and MicroLogix 1500 base units.
Q: Why buy New Surplus from you instead of direct OEM channels?
A: Factory lead times for basic discrete I/O cards can spike unexpectedly during supply chain bottlenecks. We maintain fully tested, on-the-shelf inventory ready for same-day dispatch at a lower price point than OEM list pricing.
Q: What warranty comes with this input module?
A: Every 1769-IQ16 card—whether New Surplus or Refurbished—is backed by our full 12-month replacement warranty. If a channel fails under normal operation during the first year, we replace the unit immediately.
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