PRODUCT INFORMATION
Product Overview
The Allen-Bradley 1771-IGD is a PLC-5 TTL input module designed for industrial digital signal processing. This module provides sixteen input channels compatible with transistor-transistor logic circuits. It installs directly into compatible Allen-Bradley 1771 I/O chassis backplanes. The unit accepts 5V DC input signals from TTL-compatible sensing devices and peripheral digital controllers. It connects to external field wiring using the dedicated 1771-WH wiring arm.
The 1771-IGD supports user-selectable positive and negative logic detection modes for flexible interface control. In positive logic mode, on-state voltage spans 2.0 to 5.25V DC. Off-state voltage spans -0.2 to +0.8V DC. The backplane draws 130 mA current at 5V DC. Maximum module power dissipation reaches 2.7 Watts under full operating load. Operating temperatures range from 32 to 131 degrees Fahrenheit.
TECHNICAL DATA
Technical Specifications
| Parameter | Specification |
|---|
| Number of Inputs | 16 channels |
|---|
| Voltage Category | 5V DC TTL |
|---|
| DC Operating Voltage | 5.0 to 5.3V DC |
|---|
| Backplane Current | 130 mA @ 5V DC |
|---|
| Power Dissipation | 2.7 W maximum, 0.4 W minimum |
|---|
| Operating Temperature | 32 to 131 °F (0 to 55 °C) |
|---|
| Signal Delay (On) | < 1 ms |
|---|
| Signal Voltage Rating (Positive Logic) | On: 2.0 to 5.25V DC; Off: -0.2 to +0.8V DC |
|---|
| Signal Voltage Rating (Negative Logic) | On: -0.2 to +0.8V DC; Off: 2.0 to 5.25V DC |
|---|
| Wiring Arm | 1771-WH |
|---|
| Mounting | 1771 I/O Chassis Slot |
|---|
TECHNICAL INFORMATION
Features
- Provides 16 digital input channels for TTL signal levels.
- Supports selectable positive and negative logic operation.
- Operates with 130 mA backplane current at 5V DC.
- Offers fast input signal detection with less than 1 ms turn-on delay.
- Uses the 1771-WH field wiring arm for modular connections.
TECHNICAL INFORMATION
Applications
- Interfacing TTL-level digital sensors with PLC-5 systems.
- Acquiring status signals from solid-state electronics and logic circuits.
- Processing high-speed low-voltage binary inputs in industrial machinery.
TECHNICAL INFORMATION
Connections / Interfaces
- 16 digital input points accessible through the 1771-WH wiring arm.
- Chassis backplane connector providing 5V DC logic bus communication.
TECHNICAL INFORMATION
Installation Guidelines
- Insert the module into an unpowered Allen-Bradley 1771 chassis slot.
- Secure field connections to the 1771-WH wiring arm before attaching it to the module.
- Select the required positive or negative logic configuration prior to powering the chassis.
- Maintain ambient operating temperatures within 32 to 131 degrees Fahrenheit.
TECHNICAL INFORMATION
Configuration Guidelines
- Set the hardware logic selection to match field device polarity.
- Map the 16 TTL input bits within the PLC-5 processor I/O image table.
TECHNICAL INFORMATION
Compatibility
- Allen-Bradley Series A and B 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, and 1771-A4B chassis.
- Allen-Bradley 1771-AM1 and 1771-AM2 chassis.
- Allen-Bradley 1771-WH wiring arm.
TECHNICAL RESOURCES
Documentation
COMPATIBILITY
Compatibility & Replacement
COMPATIBLE MODELSAllen-Bradley Series A and B 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, and 1771-A4B chassis. Allen-Bradley 1771-AM1 and 1771-AM2 chassis. Allen-Bradley 1771-WH wiring arm.
Verify compatibility against the exact Part Number, revision and manufacturer documentation before ordering.
PART VERIFICATION
Before You Order
Industrial automation parts can share similar model names, suffixes and revisions. Confirm the complete manufacturer Part Number before purchase.
01Check Part NumberMatch the complete ordering code on the existing unit.
02Confirm RevisionCheck suffix, hardware or firmware when applicable.
03Send a Label PhotoWe can review a clear label photo when identification is uncertain.
ORDERING PROCESS
From RFQ to Dispatch
1Submit Part Number2Verify Product Identity3Confirm Stock & Condition4Issue Quotation5Dispatch & Tracking
PRODUCT FAQ
Frequently Asked Questions
What type of input signals does the Allen-Bradley 1771-IGD accept?
The module accepts 5V DC TTL-level signals across 16 channels with selectable positive or negative logic.
Which wiring arm is required for the 1771-IGD module?
The module requires the Allen-Bradley 1771-WH wiring arm for all field wiring terminations.
Which Allen-Bradley chassis support the 1771-IGD?
It is compatible with 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, 1771-A4B, 1771-AM1, and 1771-AM2 chassis.
What is the indicative reference price for the 1771-IGD?
Observed market pricing for refurbished units is approximately $89.00 USD. This figure represents indicative market reference pricing only and is not a final quotation.
