Product Details
Overview
The Allen-Bradley 1771-IGD (1771-IGD/A) is a TTL-based digital input module designed for the PLC-5 platform. It provides reliable signal acquisition with selectable positive or negative logic, fast response times, and compatibility with a wide range of 1771-series chassis. This module is suitable for controlling and monitoring discrete signals in industrial automation systems.
Technical Specifications
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Manufacturer: Allen-Bradley
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Model Number: 1771-IGD/A
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Product Type: Digital TTL Input Module
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Category: PLC Input Module
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Compatible Chassis: 1771-A1B, 1771-A2B, 1771-A3B, 1771-A3B1, 1771-A4B, 1771-AM1, 1771-AM2
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Number of Inputs: 16 TTL channels
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Logic Type: Selectable Positive or Negative Logic
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Signal Voltage Rating:
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Positive Logic: On = 2.0–5.25 VDC, Off = -0.2–0.8 VDC
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Negative Logic: On = -0.2–0.8 VDC, Off = -2.0–5.25 VDC
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Backplane Current Draw: 130 mA @ 5 VDC
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Signal Delay:
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DC On: < 1 ms
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DC Off: 20 ± 9 ms
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AC Off: 24 ± 10 ms
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Power Dissipation: Max 2.7 W, Min 0.4 W
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Operating Temperature: 0–55 °C (32–131 °F)
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Voltage Category: 5 VDC TTL logic
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Wiring Arm: 1771-WH
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Module Status: Earlier Model
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Weight: 0.45 kg (1.0 lb)
Key Features
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Selectable positive or negative logic input for flexible control systems
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Fast signal acquisition and low delay to enhance system responsiveness
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Fully compatible with 1771-series PLC-5 I/O chassis
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TTL-level inputs for precise digital signal detection
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Compact and durable module construction
Application Scenarios
The 1771-IGD/A input module is ideal for:
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Industrial discrete input monitoring
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Machine control and automation systems
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PLC-based process control applications
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Distributed I/O installations on PLC-5 platforms
FAQ
Q1: Which chassis are compatible with the 1771-IGD/A module?
A1: It works with 1771-A1B, A2B, A3B, A3B1, A4B series and 1771-AM1/AM2 I/O chassis.
Q2: What is the maximum input voltage for this module?
A2: The module operates with TTL signals at 5.0–5.3 VDC.
Q3: How fast is the response time?
A3: DC signal on delay is less than 1 ms and DC off delay is 20 ± 9 ms.
Additional Information
- 100% Genuine Parts: All products are original and authentic, ensuring reliable industrial performance.
- 30-Day Refund Guarantee: Return any in-stock item within 30 days in original, unopened packaging for a full refund (excluding shipping and fees).
- 12-Month Warranty: Covers defects in materials or workmanship; excludes misuse, normal wear, or unauthorized modifications.
- Worldwide Shipping: We ship via USPS, UPS, FedEx, and DHL. Delivery times vary by country and may be subject to customs or import fees.
- Support & Contact: Technical and warranty assistance is available anytime. Contact us here: Contact.
- Purchase Guidance: Check product specifications and compatibility carefully before ordering to ensure proper application.
Tech & Buying Guide
Redundant Automation Systems: Ensuring Continuous Uptime in Critical Control Infrastructure
System reliability directly determines operational profitability across high stakes process industries. Modern industrial automation platforms must eliminate single points of failure to prevent catastrophic shutdowns. Deploying fault tolerant architecture safeguards complex facilities against unexpected hardware glitches, network disruptions, and maintenance outages.
Understanding Types of Noise in Electronic Circuits and Control Systems
Signal integrity directly determines measurement accuracy and loop stability across industrial automation environments. Electronic noise introduces unwanted stochastic interference into analog loops, sensor feedback lines, and digital fieldbus networks. Understanding how intrinsic electronic noise and external electromagnetic interference manifest allows control engineers to optimize signal conditioning and shield sensitive instrumentation effectively.
Why 24V DC Power Supplies Standardize Modern Industrial Automation
Industrial control cabinets worldwide rely on 24V DC as the universal power standard for field instrumentation, sensors, and controllers. Walk into any manufacturing plant, and you will find PLCs, human-machine interfaces (HMIs), and smart actuators running on extra-low voltage DC. Standardizing on 24V DC enhances operational safety, lowers cabinet footprint, and maintains steady control performance across factory networks.