ALLEN BRADLEY 1771-0W-A Selectable Contact Module 1771-0W/A 24-120V

( Brand: Allen Bradley ), ( Manufacturer Part Number: 1771-0W/A ), ( Part Type: Module )

Review ALLEN BRADLEY 1771-0w/a Series Selectable Contact Output Module

The **Allen-Bradley 1771-0W/A 24-120V Selectable Contact Module** is a versatile and high-performance relay module designed for integration into the **CompactLogix** and **ControlLogix** programmable logic controller (PLC) systems, offering reliable and flexible control solutions for industrial automation applications. This module belongs to the **1771 series**, a robust line of I/O modules engineered to meet the demands of harsh manufacturing environments, where consistent performance and durability are critical. With a **selectable voltage range of 24 to 120 volts DC**, the 1771-0W/A provides the flexibility to interface with a wide variety of low-voltage control devices, including sensors, relays, solenoids, and other DC-powered actuators. Its **normally open (NO) contact configuration** allows for direct control of external loads, making it ideal for applications requiring simple on/off switching, sequencing, or interlocking functions.

The module features a **compact, DIN-rail mountable design**, ensuring efficient space utilization in control panels while maintaining easy accessibility for maintenance and troubleshooting. Constructed with **industrial-grade materials**, it is built to withstand environmental challenges such as temperature fluctuations, vibration, and moisture, making it suitable for use in factories, processing plants, and other demanding industrial settings. The **selectable voltage range** is particularly advantageous, as it accommodates both standard 24V DC systems and higher-voltage applications up to 120V DC, reducing the need for additional voltage conversion hardware and simplifying system design. This adaptability enhances compatibility with existing infrastructure, lowering integration costs and minimizing downtime during system upgrades.

From a functional perspective, the 1771-0W/A operates as a **digital output module**, receiving control signals from the PLC to drive its relay contact, which can switch currents up to **10 amps at 24V DC** or **5 amps at 120V DC**, depending on the selected voltage setting. This capacity ensures it can handle a broad spectrum of industrial loads, including small motors, valves, indicators, and other DC-powered devices. The module s **isolated contacts** provide electrical separation between the PLC and the external circuit, enhancing safety by preventing ground loops and reducing the risk of electrical interference. Additionally, its **LED status indicator** offers real-time feedback on the module s operational state, allowing operators to quickly verify whether the contact is energized or de-energized, which is invaluable for diagnostic purposes.

In terms of installation and configuration, the 1771-0W/A is designed for seamless integration into the **Allen-Bradley ControlLogix or CompactLogix** platform, leveraging the **Ethernet/IP** or **DeviceNet** communication protocols for high-speed data exchange. The module s **plug-in or screw-terminal connection options** provide flexibility in wiring, accommodating both quick installation in modular systems and permanent setups where terminal blocks are preferred. Its **backplane or remote I/O compatibility** further extends its utility, allowing it to be deployed in distributed control architectures where remote I/O modules are required. The module s **compatibility with Rockwell Automation s Studio 5000 software** ensures that engineers can easily configure, monitor, and troubleshoot the module using intuitive programming tools, streamlining the development and maintenance of automation systems.

Overall, the **Allen-Bradley 1771-0W/A 24-120V Selectable Contact Module** represents a dependable and efficient solution for industrial control applications, combining flexibility, durability, and ease of integration. Whether used in discrete manufacturing, process control, or material handling systems, this module delivers the reliability needed to ensure consistent operation while adapting to a variety of voltage requirements. Its robust construction, clear status indicators, and seamless compatibility with Rockwell Automation s ecosystem make it a cornerstone component for engineers and technicians seeking a high-performance relay solution in their automation designs.

### **Pros and Cons of buying a Allen-Bradley 1771-0W/A (24-120V Selectable Contact Module)**

1. **Versatility in Voltage Selection** The module allows for selectable input voltage ranges (24V, 48V, 120V DC), making it adaptable to different control system configurations without requiring multiple part numbers.

2. **High Reliability** Allen-Bradley (now part of Rockwell Automation) is a well-established brand known for durable, industrial-grade components with long lifespans.

3. **Compatibility with PLC Systems** Designed to integrate seamlessly with Rockwell Automation PLCs (e.g., ControlLogix, CompactLogix, SLC 500), reducing wiring complexity and improving system performance.

4. **Low Contact Resistance** The contact module maintains consistent performance over time, minimizing false signals or wear-related failures.

5. **Easy Installation** Standardized mounting (17-slot CompactLogix/ControlLogix) and straightforward wiring make it accessible for technicians with basic experience.

6. **Wide Industrial Use Case** Suitable for applications requiring dry contact inputs, such as pushbuttons, limit switches, or auxiliary relays in machinery control.

7. **Support for Remote I/O** Works well in distributed I/O setups, allowing for flexible system expansion without overloading a central PLC rack.

8. **Documentation and Support** Comprehensive manuals, technical support, and availability of spare parts ensure long-term maintainability.

1. **Cost** Compared to generic or non-branded contact modules, the Allen-Bradley 1771-0W/A is relatively expensive, which may be a barrier for budget-conscious projects.

2. **Limited to Rockwell Ecosystem** While highly compatible with Rockwell PLCs, it may not integrate as easily with third-party systems (e.g., Siemens, Schneider) without additional gateways or converters.

3. **Voltage Selection Requires Configuration** The user must physically set the voltage range (via DIP switches or jumpers) before installation, which could lead to errors if misconfigured.

4. **Obsolete Status (Potential Concern)** The 1771 series is older, and while still supported, Rockwell may phase out some components in favor of newer modules (e.g., 1769 series). Future availability could become an issue.

5. **No Built-in Diagnostics** Unlike some newer modules, this contact module lacks advanced fault reporting or self-diagnostic features, requiring manual troubleshooting.

6. **Physical Size Constraints** Occupies a full 17-slot space in a CompactLogix/ControlLogix chassis, which may limit rack density in space-constrained applications.

7. **Dependence on PLC Firmware** Performance may vary slightly based on the PLC s firmware version, requiring occasional updates to ensure compatibility.

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### **Conclusion**

The **Allen-Bradley 1771-0W/A** is a robust, versatile contact module ideal for applications within Rockwell Automation s ecosystem where voltage flexibility and reliability are critical. Its strengths lie in its compatibility with PLC systems, durability, and ease of integration, making it a sound choice for industrial control environments where downtime is costly. However, its higher cost, limited third-party compatibility, and potential long-term availability concerns must be weighed against the benefits.

For **new projects**, evaluating newer alternatives (e.g., 1769 series modules) may offer better long-term support and cost efficiency. For **existing systems** already using Rockwell hardware, the 1771-0W/A remains a dependable option if budget and compatibility align.

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### **Recommendation**

- You are working within a Rockwell Automation PLC environment (ControlLogix, CompactLogix, or SLC 500).

- Your system requires selectable 24V/48V/120V DC input flexibility.

- Reliability and long-term availability are priorities, and you can justify the cost.

- The module will be used in a controlled, industrial setting where compatibility with legacy systems is necessary.

- You are open to newer Rockwell modules (e.g., 1769 series) for better future-proofing.

- Your budget is constrained, and generic or third-party modules meet your voltage and performance requirements.

- Your system integrates with non-Rockwell PLCs, and you need broader compatibility.

For most **new installations**, a cost-benefit analysis against newer Rockwell modules or third-party options (e.g., Siemens, ABB) is advisable. However, for **maintenance or upgrades of existing Rockwell-based systems**, the 1771-0W/A remains a pragmatic choice.

Details:

Allen Bradley Selectable Contact Output Module, 1771-0W/A. 1 lb 0.3 oz 51426 QTY: Series A condition: Used, Good working Condition.

part #: 17710w prices

• $11.00-$100.00

specifications sensoindustria:

• brand: Allen Bradley
• mpn: 1771-0w/a
• part type: Module

payments sensoindustria:

• other
• credit card: Mastercard
• wallet: Paypal

offer sensoindustria:

• quantity: 1
• started: May 14, 2026
• sold: 0
• availability: In Stock
• options: Ship-to-home

shipping sensoindustria:

• transit: 4-9 Days
• class: Standard, Expedited
• type: Calculated
• cost: $16.45
• carrier: USPS, FedEx
• service: USPS Ground Advantage, USPS Priority Mail, FedEx Ground / FedEx Home Delivery

returns sensoindustria:

• paid by: Buyer
• method: Money back
• policy: Returns Accepted
• time: 30 Days

seller sensoindustria:

• city: York, South Carolina
• rating: 100.0%
• # reviews: 10387

general sensoindustria:

• PLCs HMIs > PLC Peripheral Modules > PLC Input Output Modules
• condition: Used

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