1771-IH Rockwell Automation Bulletin 1771 DC Input Module
Manufacturer: Allen-Bradley
Product No.: 1771-IH
Condition： In stock
Product Type: DC Input Module
Product Origin: USA
Payment: T/T, Western Union
Weight: 900g
Shipping port: Xiamen
Warranty: 12 months
Estimate delivery times: 12-26 days (International), 3-6 days (United States).
Return within 30 days of purchase. Duties & taxes are non-refundable.
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Product Overview & Architecture
The **1771-IH** is a high-performance digital direct current input module engineered by **Rockwell Automation** under the **Allen-Bradley** brand, built specifically for the legacy **PLC-5** control platform within **Bulletin 1771** I/O chassis. Designed to interface field-level discrete signals with high reliability, the **1771-IH** provides 8 isolated input channels supporting sink configurations with source loads across a 10 to 60 V dc operational category.
Global PLC Spare HUB's Insight & Technical Review
Maintaining legacy **PLC-5** hardware requires strict adherence to backplane loading and thermal thresholds. During routine retrofits of older continuous processing lines, engineers frequently evaluate the input impedance matching of legacy modules against modern field sensors to prevent ghost-voltage states. Based on our practical evaluation of **Bulletin 1771** racks, the **1771-IH** manages this through robust internal impedance scaling (2.5-3k ohms on-state). Its 74 mA backplane current draw at 5V dc ensures that rack power supplies remain within safe operational envelopes even when slots are fully populated.
Technical Specifications Breakdown
| Technical Parameter | Configuration Metric / Specification Detail |
|---|---|
| **Brand / Manufacturer** | **Allen-Bradley / Rockwell Automation** |
| **Catalog Number / Model** | **1771-IH** |
| **Product Family & Series** | **PLC-5 / Bulletin 1771** Modular System |
| **Module Classification** | Digital DC Input Module (Sink / Source Load) |
| **Input Channel Density** | 8 Independent Channels |
| **Nominal Voltage Category** | 10 to 60 V dc |
| **Operating Voltage Range** | 24 to 50 V dc nominal (24-48V typical) |
| **Input Current Characteristics** | 8.4 mA at 24V dc; 20 mA at 48V dc |
| **Input Impedance** | 2.5 - 3 kΩ (On-State) / 5 - 6 kΩ (Off-State) |
| **Switching Thresholds** | Max On-State Voltage: 10V dc | Max Off-State Voltage: 4.5V dc |
| **Off-State Leakage Limits** | Max Off-State Current: 1.0 mA (0.7 mA typical) |
| **Signal Propagation Delay** | On-Delay: 15 ms (±7 ms) | Off-Delay: 20 ms (±9 ms) / AC Off-Delay: 24 ms (±10 ms) |
| **Backplane Power Draw** | 74 mA at 5V dc (±5%) |
| **Thermal & Power Dissipation** | Power: 0.4W min to 8.1W max | Thermal: 1.3 to 27.7 BTU/hr |
| **Dielectric Isolation** | 1500V ac rms channel-to-backplane |
| **Operating Temperature** | 0 °C to 60 °C (32 °F to 140 °F) |
| **Physical Interfacing** | Rack Mountable with 1771-WA / 1771-WD Wiring Arm |
Hardware Configuration & Installation Guidelines
- **Chassis Insertion:** Designed for direct rack mounting into standard **Bulletin 1771** I/O chassis backplanes.
- **Termination Interface:** Utilizes a removable wiring arm (**1771-WA** / **1771-WD**) allowing field cabling to remain undisturbed during module swaps.
- **Backplane Budgeting:** Account for the 74 mA 5V dc current requirement when calculating total rack power supply capacity.
Diagnostics & Troubleshooting Capabilities
- **Channel Status Indication:** Features 8 front-panel red LED indicators corresponding directly to individual input channel states for rapid verification.
- **Delay Filtering:** Built-in hardware signal filtering (15 ms on / 20 ms off delays) prevents false triggering caused by transient electrical noise in heavy industrial settings.
- **Isolation Verification:** 1500V rms isolation protects processor backplanes from high-voltage field side ground loops or surges.
Compatible Hardware & Typical Application Scenarios
- **Compatible Systems:** **Allen-Bradley PLC-5** programmable controllers utilizing **Bulletin 1771** local and remote I/O racks.
- **Target Applications:** Heavy manufacturing discrete sensor monitoring, legacy water treatment plant pump control interlocks, and continuous assembly line limit switch tracking.
Logistics, Warranty & Fulfillment
- **Package Contents:** 1 x **1771-IH** Digital DC Input Module packaged securely in static-shielding material.
- **Shipping Partners:** Rapid 24-48 hour order fulfillment dispatched globally via premium couriers including FedEx, UPS, and DHL.
- **Warranty Coverage:** Fully backed by a 12-month operational service warranty.
Frequently Asked Questions (FAQ)
Can the **1771-IH** module be replaced while the chassis power supply remains active?
While **Bulletin 1771** systems feature removable wiring arms that protect field cabling, hot-swapping older modules under power is generally discouraged to prevent backplane arcing; always verify rack power protocols before extraction.
What diagnostic steps should I take if a channel LED does not illuminate despite active field voltage?
First, measure the voltage directly across the wiring arm terminals to ensure it exceeds the 10V dc maximum on-state threshold. Next, verify that the input impedance path is sound and check for loose terminal screws on the **1771-WA** / **1771-WD** arm.
How does source loading affect sensor compatibility with this input module?
The **1771-IH** is configured for sink input operation (source loads). Ensure your 24V dc field sensors source current outward to match the module's sinking architecture correctly.
What guidance should I follow when sourcing a replacement for an older revision module?
When upgrading or replacing an earlier model **1771-IH**, verify your chassis slot power budget (74 mA at 5V dc) and confirm that your existing wiring arm configuration matches pinout requirements to avoid rewiring delays.
How are modules protected against electrical noise on long industrial cable runs?
The module incorporates native input signal delays (15 ms on-delay and 20 ms off-delay) alongside 1500V ac rms isolation, which effectively dampens high-frequency electromagnetic interference picked up across extended plant wiring.
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Q: Are these parts 100% original and new?
A: Yes. Every component is guaranteed to be 100% original, brand-new, and factory-sealed. We also provide a 12-month comprehensive warranty for your peace of mind.
Q: How fast is the shipping to my country?
A: For in-stock items, we offer same-day dispatch. International express shipping (DHL/FedEx/UPS) typically delivers within 3–5 business days worldwide.
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A: Absolutely. Our sales team is ready to provide a detailed Proforma Invoice (PI) including the most competitive shipping rates for your location.
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A: We provide volume-based pricing for large projects or multiple-item orders. Please contact us to get our Best Price Guarantee.
12-Month Comprehensive Warranty
Every part supplied by Global PLC Spare Hub is covered by a 12-month warranty from the date of invoice.
- Coverage: Functional defects and hardware failures under normal operating conditions.
- Commitment: We provide immediate repair, replacement, or a full refund for any verified defective components to minimize your operational downtime.
Returns & Exchange Policy
We offer a 30-day return policy to ensure you receive the exact part your system requires.
- Eligibility: Returns are accepted for uninstalled items in their original, factory-sealed packaging.
- RMA Process: Please contact our support team to obtain a Return Merchandise Authorization (RMA) number before shipping.
- Fast Processing: Refunds or exchanges are processed within 3–5 business days after the returned item passes our technical inspection.
Need Technical Assistance?Not sure if this part is compatible with your system? [Consult our Engineers] before purchasing to ensure 100% compatibility.
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