Product Overview
In discrete manufacturing and process control environments, reliable input sensing is the foundation of accurate machine logic. The Allen-Bradley 1769-IG16 CompactLogix 16-point TTL input module delivers dependable digital input performance for CompactLogix systems. This module accepts 16 current-sourcing low-to-true inputs and operates within a 4.5 to 5.5 V DC range, making it ideal for TTL-level signals common in high-speed counting, position feedback, and interlock circuits.
As part of the CompactLogix family, the 1769-IG16 integrates seamlessly with Allen-Bradley controllers and is available in Series A and B revisions. Its compact single-slot design saves panel space while offering robust electrical isolation and flexible mounting options.
Technical Specifications
The table below lists the key technical parameters for the Allen-Bradley 1769-IG16, sourced directly from the manufacturer's data.
| Specification |
Value |
| Manufacturer |
Rockwell Automation |
| Brand |
Allen-Bradley |
| Part Number |
1769-IG16 |
| Product Line |
CompactLogix |
| Module Type |
16 Point TTL Input Module |
| Input Type |
TTL Input |
| Working Voltage Rating |
30 V AC / 30 V DC |
| Operational Voltage Range |
4.5 to 5.5 V DC |
| Input Signal Delay |
8 ms |
| Ripple Voltage |
50 mV peak-to-peak |
| Draw Current |
120 mA at 5.1 V DC |
| Power Dissipation |
1.6 W |
| OFF-State Voltage Range |
2.0 to 5.5 V DC at 4.1 mA |
| ON-State Voltage Range |
2 to 5.5 V DC |
| Isolation Voltage |
75 V DC (reinforced, tested at 1697 V DC for 1 s) |
| Distance Rating |
8 modules |
| Wire Type |
Copper, 90 °C |
| Wire Size (Solid) |
22-14 AWG |
| Operating Temperature |
-40 to 85 °C (-40 to 185 °F) |
| Relative Humidity |
5 to 95% non-condensing |
| Altitude |
Up to 2000 m (6561 ft) without derating |
| Shock Rating |
30 G operational |
| Vibration Rating |
5 G at 10 to 500 Hz |
| Weight |
250 g (0.55 lb) |
| Dimensions (H x W x D) |
118 x 35 x 87 mm (4.65 x 1.38 x 3.43 in) |
| Shipping Weight |
2 lbs |
| Shipping Dimensions |
8 x 8 x 5 in |
| Replacement Terminal Block |
1769-RTBN18 |
Industry Applications
The 1769-IG16 is well-suited for applications requiring fast, TTL-level digital input detection. Typical uses include:
-
High-speed counting: In packaging or material handling lines, the module's 8 ms input delay and 4.5-5.5 V DC range ensure accurate pulse counting from encoders or proximity sensors.
-
Interlock circuits: In machine safety circuits, the 1769-IG16 provides reliable low-to-true input sensing, helping maintain safe operation.
-
Process control: In chemical or food processing plants, the module monitors discrete sensors (e.g., limit switches, photoelectric sensors) with TTL outputs, feeding status back to the CompactLogix controller.
Because the 1769-IG16 supports both AC and DC working voltages (30 V AC/DC), it offers flexibility in mixed-voltage environments.
Installation & Setup
Mount the 1769-IG16 on a DIN rail or panel using the integrated mounting holes. The module occupies a single slot in the CompactLogix chassis. When wiring, use copper wire rated for 90 °C, with solid wire sizes from 22 to 14 AWG. The recommended terminal block is the 1769-RTBN18. Tighten terminal screws to 6 lb-in. Ensure proper isolation: the module provides 75 V DC isolation between input points and the backplane, tested at 1697 V DC for 1 second.
Maintenance & Reliability
To maximize uptime, follow a simple maintenance routine. Periodically inspect wiring connections for looseness or corrosion. Check the operating environment stays within -40 to 85 °C and 5-95% non-condensing humidity. The module withstands up to 30G shock and 5G vibration (10-500 Hz), so it is robust for most industrial settings. Because the 1769-IG16 is a current product, replacement parts and support remain available, reducing lifecycle risk.
Compatibility & Integration
The 1769-IG16 is designed for CompactLogix controllers and is compatible with Series A and B backplanes. It supports up to 8 modules in a power supply distance rating, allowing flexible system expansion. The module communicates over the CompactLogix backplane; no separate communication cable is needed beyond the terminal block wiring.
Selection Guide & Purchasing Advice
Before purchasing, verify your system's power supply capacity and backplane slot availability. Confirm the input voltage range matches your sensor outputs (4.5-5.5 V DC). For replacements, check the revision (A or B) to ensure compatibility with your existing firmware. The 1769-IG16 includes a replacement terminal block (1769-RTBN18) for convenience. For a reliable source, consider PLC Source PRO for genuine Allen-Bradley parts.