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Help Center1771-DS ALLEN BRADLEY PLC-5 LATCHING INPUT MODULE 1771DS
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Rossonix Co., Limited is your trusted partner for high-quality industrial automation components. With over a decade of experience in the global market, we proudly present the Allen Bradley 1771-DS PLC-5 Latching Input Module. Designed for demanding applications, this module provides reliable latching input functionality that ensures accurate signal capture and retention even in noisy or transient environments. Whether you are upgrading an existing PLC-5 system or building a new control panel, the 1771-DS offers the performance and durability you need to keep your operations running smoothly.
The 1771-DS is a specialized input module within the Allen Bradley PLC-5 family, engineered to handle latching inputs that store the state of an input signal until it is explicitly reset by the processor. This feature is critical in applications where momentary events (such as limit switch actuations, push-button presses, or safety interlocks) must not be missed. By integrating this module into your PLC-5 rack, you gain enhanced control over machine sequences, reduce downtime due to missed signals, and improve overall system reliability.
Below, we have compiled a comprehensive overview of the module’s key specifications, features, and benefits. For detailed technical questions, please contact our experienced sales engineers.
Key Features & Benefits
Latching input capture: Each input channel can be configured to latch on the leading edge of a signal, holding that state until a reset command is issued. This eliminates the risk of losing transient events.
High noise immunity: Built-in optical isolation and filtering protect against electrical noise, ensuring accurate readings in industrial environments with motors, drives, and welding equipment.
Direct compatibility: Plugs directly into any standard 1771 I/O chassis (e.g., 1771-A1B, 1771-A2B, 1771-A4B) without additional adapters. Works with all PLC-5 processors (PLC-5/11, /20, /30, /40, /60, /80).
Easy troubleshooting: LED indicators on the front panel show the status of each input and the module’s health, simplifying diagnostics.
Field-proven reliability: Built to Allen Bradley’s rigorous quality standards, with a mean time between failures (MTBF) exceeding 500,000 hours in typical conditions.
Cost-effective upgrade: Replace obsolete or damaged modules without redesigning your control system. The 1771-DS remains widely available through Rossonix’s global supply chain.
Technical Specifications
| Parameter | Value |
|---|---|
| Module Type | 1771-DS Latching Input Module |
| Number of Inputs | 16 points (sink/source configurable) |
| Input Voltage Range | 10-30V DC (24V nominal) |
| Input Current (per point) | 12 mA @ 24V DC |
| Off-State Voltage | ≤ 5V DC |
| On-State Voltage | ≥ 10V DC |
| Response Time (max) | 1 ms (typical), 2 ms (max) |
| Isolation Voltage | 1500V DC (optical isolation between field and logic) |
| Operating Temperature | 0°C to 60°C (32°F to 140°F) |
| Storage Temperature | -40°C to 85°C |
| Relative Humidity | 5% to 95% (non-condensing) |
| Power Consumption | 5V DC @ 200 mA (from backplane) |
| Weight | 0.5 kg (1.1 lbs) |
| Certification | Rossonix is ISO 9001 & ISO 9000 certified; product meets applicable UL/CSA/CE standards (supplier declaration) |
Why Choose Rossonix for Your 1771-DS Module?
Rossonix Co., Limited has been serving the industrial automation sector since 2011. Over the past decade, we have built a global network that spans North America, South America, Europe, the Middle East, Oceania, and Asia. Our annual export value exceeds US$5 Million, a testament to the trust our customers place in our products and services. With a dedicated team of 11–50 employees and an overseas office, we ensure prompt communication and fast delivery from our warehouses in Shenzhen, Hong Kong, and Europe.
Every 1771-DS module we supply undergoes rigorous functional testing before shipment. We source from reputable manufacturers and authorized distributors, guaranteeing genuine Allen Bradley components. Whether you need a single unit for a spare part or bulk quantities for a plant-wide upgrade, we offer competitive pricing and flexible shipping options (FOB, CIF, EXW).
Our commitment to quality is backed by ISO 9001 and ISO 9000 certification. We understand that downtime costs money, so we strive to ship most orders within 24 hours of order confirmation. For urgent requirements, expedited shipping is available upon request.
Frequently Asked Questions (FAQ)
What is the difference between a standard input module and the 1771-DS latching input module?
The 1771-DS captures and holds the input state after a signal transition. Standard modules only reflect the current state. The latching function ensures that even a brief pulse (e.g., 1 ms) is remembered until the processor explicitly resets it.Can I use the 1771-DS in a PLC-5 system with other series I/O modules?
Yes, the 1771-DS is fully compatible with all 1771 I/O modules and any PLC-5 processor. It occupies one slot in the backplane and communicates via the standard 1771 bus.Is the module compatible with 24V AC input signals?
No, the 1771-DS is designed for DC inputs only (10-30V DC). For AC inputs, please consider the 1771-IA, -IB, or -IC series modules.Does the module require external power?
No, power is supplied through the backplane. The module draws 5V DC from the chassis power supply (typically 200 mA). No additional power source is needed.How do I reset a latched input?
The processor must send a reset command to the module. This is typically done by writing a 0 to the corresponding output bit in a control block. Consult your PLC-5 programming manual for detailed ladder logic examples.What is the lead time for ordering the 1771-DS?
We maintain a healthy stock of 1771-DS modules. Standard orders are shipped within 1-3 business days. For large quantities (50+ units), please allow 5-7 business days. Contact our sales team for specific lead times.Do you provide a warranty?
Yes, all modules come with a standard 12-month warranty against manufacturing defects. Extended warranties are available as an option.Can I get a datasheet or manual for the 1771-DS?
Certainly. We can provide the original Allen Bradley documentation (user manual, installation instructions) upon request. Please email us after placing your order.
Don’t let a missed signal compromise your production line. The Allen Bradley 1771-DS Latching Input Module is the reliable solution for capturing critical events in your PLC-5 system. With Rossonix’s global reach, ISO-certified quality management, and responsive customer support, you can rest assured you are making a sound investment. Contact us today for a quote or technical consultation – our team is ready to assist you in optimizing your automation infrastructure.
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