Allen-Bradley 1771-IG TTL Digital DC Input Module

SKU 1771-IG

In stock

12-month warranty
Free returns within 30 days

Manufacturer: Allen-Bradley
Product No.: 1771-IG
Origin United States
Product Type: Digital Input Module
Payment: T/T, Western Union
Weight: 1.0 kg
Shipping port: Xiamen
Warranty: 12 months

Product Description

Description

The Allen-Bradley 1771-IG is a TTL Digital DC Input Module designed for the PLC-5 and 1771 I/O platform. This module effectively converts DC signals from various user-supplied automation devices to the logic levels required by the processor, managing the corresponding bit states within the PLC data table. It is engineered specifically for transistor-transistor logic (TTL) and binary-coded decimal (BCD) interface encoder applications, making it well-suited for high-precision industrial data acquisition and positioning setups.

Constructed for reliable operation within standard 1771 I/O chassis, the 1771-IG integrates features to safeguard logic integrity against electrical noise. It includes provisions for a 1771-WC wiring arm, enabling simplified module replacement and maintenance without requiring the disconnection of field wiring.

Features

Compatible with Allen-Bradley PLC-5 systems and standard 1771 I/O chassis architecture
Designed for 5VDC TTL and BCD interface encoder applications
Includes wiring arm compatibility (1771-WC) for fast module replacement without rewiring
Optical isolation between field input signals and the system backplane
Conformal-coated circuit boards for enhanced durability in harsh industrial environments

Applications

TTL encoder interfacing and position feedback monitoring
BCD switch data reading
High-speed digital DC signal conversion in PLC-5 architectures
Legacy discrete automation and process control systems

Technical Specifications

Parameter	Specification
Manufacturer	Allen-Bradley / Rockwell Automation
Exact Model	1771-IG
Product Type	TTL Digital DC Input Module
Series	PLC-5 / 1771 I/O Platform
Voltage Category	5VDC (TTL)
Operating Voltage Range	5.0 to 5.3 VDC
Backplane Current Draw	122 mA
Isolation Voltage	1,500 VAC rms between input and backplane
Input Signal Delay	Less than 1 ms
Mounting	Chassis / Rack Mount (1771 I/O Base)
Country of Origin	United States

Connections / Interfaces

The 1771-IG module connects to field devices via a removable 1771-WC wiring arm attached to the front of the I/O chassis. This interface secures all sensor signal wiring, allowing the electronic module to be inserted or removed from the backplane without disturbing field terminations. Backplane communication and power are established directly through the module's rear edge connector when seated in the 1771 chassis.

Installation Guidelines

Ensure all power to the 1771 I/O chassis and associated rack power supply is turned off before installing or removing the module.
Verify that the chassis backplane power requirements are not exceeded by adding this module.
Mount the 1771-WC wiring arm to the swing-bar on the front of the chassis slot.
Align the 1771-IG module with the chassis guides and slide it smoothly into the designated slot until firmly seated against the backplane connector.
Secure the module using top and bottom retaining latches and swing the wiring arm into place.

Compliance and Certifications

UL Listed Industrial Control Equipment
CSA Certified
CE compliant for applicable directives

Shipping & Returns

Global Express Shipping

Standard Delivery: 4–6 business days via DHL, FedEx, and UPS.
Express Dispatch: Same-day dispatch for in-stock orders placed before 2:00 PM (GMT+8).
Worldwide Coverage: Serving over 150 countries.

Returns & Warranty

30-Day Guarantee: Returns accepted for in-stock products in original, factory-sealed packaging.
12-Month Warranty: Every industrial component is backed by our technical warranty.

FAQ

What systems and platforms are compatible with the Allen-Bradley 1771-IG module?

The Allen-Bradley 1771-IG is a TTL Digital DC Input Module specifically engineered for seamless integration with Allen-Bradley PLC-5 systems and standard 1771 I/O chassis architecture. It mounts directly into standard 1771 I/O racks, drawing 122 mA from the backplane to power its logic circuitry. This compatibility makes it an ideal solution for upgrading or maintaining legacy discrete automation and process control systems.

What are the primary target applications for the Allen-Bradley 1771-IG?

The Allen-Bradley 1771-IG TTL Digital DC Input Module is designed primarily for 5VDC transistor-transistor logic (TTL) and binary-coded decimal (BCD) interface encoder applications. It excels in high-precision industrial data acquisition, TTL encoder interfacing, position feedback monitoring, and BCD switch data reading. The module quickly converts these specialized DC signals to the required processor logic levels.

How does the Allen-Bradley 1771-IG handle field wiring and module replacement?

The Allen-Bradley 1771-IG utilizes a removable 1771-WC wiring arm that attaches to the front of the I/O chassis to secure all sensor signal cabling. This design allows maintenance technicians to remove or replace the electronic module without disconnecting any field wiring from the terminal block. Backplane communication and power are subsequently established directly through the rear edge connector once seated in the chassis.

What are the key electrical specifications and isolation ratings of the Allen-Bradley 1771-IG?

The Allen-Bradley 1771-IG operates within a nominal 5VDC voltage category, with an operating range spanning from 5.0 to 5.3 VDC for TTL compatibility. It features an optical isolation rating of 1,500 VAC rms between the input signals and the system backplane to safeguard logic integrity against electrical noise. Additionally, the unit delivers a fast input signal delay of less than 1 ms for high-speed digital DC signal conversion.

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