Product Summary
The 1771-ID16 digital AC/DC input module delivers 16 isolated inputs for PLC‑5 systems. It operates on 120V AC or DC voltage with built‑in transient filtering. This module suppresses electrical noise and contact bounce, ensuring stable signal acquisition in harsh industrial environments.
Product Procurement & Buyer Guide
Why Choose the 1771-ID16 for Your PLC‑5 System?
Procurement engineers value the 1771-ID16 for its dual‑voltage flexibility. It supports AC power from 77 to 138V and DC from 105 to 138V. This wide range simplifies inventory by covering multiple voltage standards in one module.
The module’s input filtering dramatically improves power quality. It suppresses voltage transients caused by contact bounce or radiated noise. This reduces unplanned downtime and extends equipment lifespan.
With 16 inputs and a backplane current draw of only 75 mA, the module integrates easily into existing I/O chassis. It works with 1771‑A1B or 1771‑A4B chassis and later versions.
Key Technical Specifications for Buyers
Allen‑Bradley designed the 1771‑ID16 for isolated‑circuit, multi‑phase applications. It interfaces with float switches, limit switches, selector switches, and pushbuttons.
The module ships with a 40‑terminal field wiring arm (catalog 1771‑WN). This allows hot‑swapping the module without disconnecting field wiring. Installation is quick and maintenance is simplified.
Signal delays are factory‑set for reliable performance. AC signal delay on‑to‑off is 9 or 18 ms, while DC on‑to‑off is 9 ms. This predictable timing helps engineers design accurate control logic.
Expert Technical Evaluation & Performance Review
Transient Suppression and Signal Fidelity
The 1771‑ID16 applies customer‑selectable input filtering to filter out electrical noise. This feature is critical in environments with heavy machinery or variable‑frequency drives. It ensures that only valid signals reach the processor.
The module’s capacitive impedance input does cause initial inrush current. Designers should account for this when sizing power supplies. The typical signal delay for AC off‑to‑on is 1 ms, and for DC off‑to‑on it is also 1 ms.
These fast response times make the module suitable for high‑speed sensing applications. The isolation between input channels prevents ground loops and cross‑talk.
Dimensions and Environmental Fit
The 1771-ID16 measures 3.5 x 6.5 x 2.0 inches (89 x 165 x 51 mm). Its compact footprint fits easily in standard PLC‑5 racks. The module is built for industrial environments with wide temperature tolerances.
All connections use the included 1771‑WN wiring arm. This arm attaches to the chassis pivot bar, enabling module replacement without rewiring. This design saves significant labor during troubleshooting or upgrades.
Logistics & Standard Packaging Details
