Product Overview of the Allen-Bradley 1769-IG16 Module

The Allen-Bradley 1769-IG16 belongs to the CompactLogix product line. This module provides 16 current-sourcing TTL inputs for digital signals. The operational voltage range spans 4.5 to 5.5 Volts DC. Consequently, this module interfaces directly with 5V TTL logic devices.

The 1769-IG16 has an OFF-state voltage range between 2.0 and 5.5 Volts DC. The OFF-state current reaches 4.1mA maximum when the input is off. The ON-state voltage range spans 2 to 5.5 Volts DC for reliable detection. Therefore, this module accepts standard TTL signal levels from external devices.

A digital filter with selectable delay times improves noise immunity. Delay options include 0, 100, 500, 1, 2, 4, and 8 milliseconds. Both ON to OFF and OFF to ON delays are configurable independently. Accordingly, the 1769-IG16 adapts to various field conditions.

Technical Specifications of the 1769-IG16

• Manufacturer: Rockwell Automation

• Brand: Allen-Bradley

• Part Number: 1769-IG16

• Product Line: CompactLogix

• Module Type: 16 Point TTL Input Module

• Input Type: TTL current-sourcing low to true

• Working Voltage Rating: 30V AC / 30V DC

• Operational Voltage Range: 4.5 to 5.5V DC

• Ripple Voltage: 50mV peak-to-peak maximum

• Input Signal Delay: 8 milliseconds typical

• Current Draw: 120mA at 5.1V DC

• Power Dissipation: 1.6W when operational

• Isolation Voltage: 75V DC (tested at 1697V DC for 1 second)

• Distance Rating: 8 modules from power supply

• Wire Type: Copper, 90°C rated

• Wire Size (Solid): 22-14 AWG

• Replacement Terminal Block: 1769-RTBN18

• Operating Temperature: -40 to 85°C

• Relative Humidity: 5 to 95% non-condensing

• Altitude: 2000 meters without derating

• Operational Shock: 30G

• Operational Vibration: 5G at 10 to 500 Hz

• Weight: 250g (0.55 lbs)

• Dimensions: 118 x 35 x 87 mm

The Allen-Bradley 1769-IG16 draws 120mA from the 5.1V DC backplane supply. Power dissipation reaches 1.6 watts during normal operation. The isolation voltage between input points and the bus is 75V DC. Furthermore, reinforced insulation is tested at 1697V DC for one second.

Digital Filter and Input Delay Features

The 1769-IG16 includes a programmable digital filter for noise rejection. Seven selectable delay times accommodate different input signal characteristics. A setting of 0 milliseconds provides the fastest response time. Longer delay settings filter out electrical noise and contact bounce.

The input signal delay time is 8 milliseconds at the default filter setting. OFF to ON and ON to OFF delays are independently selectable. This flexibility allows optimization for specific field devices. For example, slow mechanical switches benefit from longer delay settings.

The current-sourcing input design accepts signals from TTL outputs. Low to true logic means a low voltage indicates an active input. This matches standard 5V TTL logic conventions. Therefore, the 1769-IG16 connects directly to TTL circuits without extra components.

Mechanical and Environmental Ratings

The 1769-IG16 operates across a wide temperature range of -40 to 85°C. This makes the module suitable for extreme industrial environments. The relative humidity tolerance reaches 95% without condensation. Consequently, the module works in humid conditions without failure.

Operational shock rating is 30G for rugged applications. Operational vibration tolerance is 5G from 10 to 500 Hertz. The module mounts on either a DIN rail or a panel. Terminal screws require 6 pound-inches of torque for secure connections.

The single slot width saves space in the CompactLogix chassis. The distance rating allows 8 modules from the power supply. Altitude operation reaches 2000 meters without any derating. Thus, the 1769-IG16 suits high altitude installations as well.

Installation Guide for the 1769-IG16

Follow these steps to install the Allen-Bradley 1769-IG16 correctly.

1. Power down the CompactLogix system completely before installation.

2. Select an available slot to the right of the power supply.

3. Align the module with the slot guides and backplane connector.

4. Push firmly until the module seats fully into the backplane.

5. Secure the module using the top and bottom retaining clips.

6. Connect field wiring to the removable terminal block.

7. Use copper wire rated for 90°C with 22 to 14 AWG size.

8. Tighten terminal screws to 6 pound-inches of torque.

9. Attach the terminal block to the front of the module.

10. Power up the system and verify module status.

The working voltage must not exceed 30V AC or 30V DC. Input signals must stay within the 4.5 to 5.5V DC range. Do not apply voltages above 5.5V to any input point. The 1769-IG16 will be damaged by higher voltage signals.

Package Contents for Allen-Bradley 1769-IG16

• 1 x Allen-Bradley 1769-IG16 TTL input module

• 1 x Removable terminal block (1769-RTBN18 compatible)

• 1 x Module identification label sheet

• 1 x Installation instructions quick reference

Frequently Asked Questions (FAQ)

1. What type of signals does the 1769-IG16 accept?
The Allen-Bradley 1769-IG16 accepts 5V TTL current-sourcing low to true signals. The operational voltage range is 4.5 to 5.5V DC only. Higher voltage signals will permanently damage the input circuits.

2. Can I use this module with 24V DC sensors?
No, the 1769-IG16 is designed exclusively for 5V TTL logic signals. Using 24V DC sensors will destroy the input circuitry. Select a different CompactLogix input module for 24V applications.

3. What is the purpose of the selectable digital filter?
The digital filter removes electrical noise and contact bounce from input signals. Longer filter times provide better noise immunity but slower response. Shorter filter times give faster response but less noise rejection.

4. How far can the 1769-IG16 be from the power supply?
The distance rating allows up to 8 modules between the module and power supply. Each module draws current from the backplane bus. Exceeding 8 modules may cause insufficient voltage at the end of the rack.

5. What is the difference between Series A and Series B?
Both Series A and Series B have identical electrical specifications. Series B includes minor manufacturing improvements and updated firmware. Both series are fully compatible within the same system.