ALLEN BRADLEY FOXBORO 967306-01 Loop Controller Invensys Ab 1771-LC1/B

( Brand: Allen Bradley Foxboro ), ( Manufacturer Part Number: 967306-01 ), ( Part Type: Controller )

Review ALLEN BRADLEY FOXBORO 1771-lc1/b Loop Controller Invensys Ab

The **Allen Bradley Foxboro 967306-01 1771-LC1/B Loop Controller (1771LC1B)** is a robust, high-performance analog loop controller designed for industrial process automation within the Invensys AB (now part of Emerson Automation Solutions) legacy control system lineup. This compact yet powerful device is engineered to provide precise control over single-loop processes, making it an ideal choice for applications requiring reliable temperature, pressure, flow, or level regulation in manufacturing, chemical processing, power generation, and other demanding environments. Built with a rugged, industrial-grade construction, the 1771-LC1/B features a durable metal enclosure that ensures resistance to harsh conditions, including temperature fluctuations, vibration, and electromagnetic interference, while maintaining consistent performance over extended operational lifespans.

At its core, the 967306-01 1771-LC1/B operates as a standalone analog controller, capable of handling a wide range of control algorithms, including proportional-integral-derivative (PID), cascade, ratio, and feedforward control schemes. Its modular design allows for easy integration into larger control networks, such as the Foxboro I/A Series or Allen Bradley s PLC systems, via its built-in communication interfaces, including the **1771-LC1/B s proprietary loop bus** or optional **RS-485 Modbus** connectivity for enhanced data logging and remote monitoring. The controller s front panel is equipped with a **backlit LCD display**, intuitive navigation buttons, and configurable LED indicators, enabling operators to quickly adjust setpoints, view process variables, and diagnose issues without requiring extensive technical intervention.

One of the standout features of the 1771-LC1/B is its **flexible input/output (I/O) capabilities**, accommodating a variety of analog signals such as 4-20 mA, 0-20 mA, 0-10 VDC, and RTD/Pt100 temperature inputs, as well as relay or transistor outputs for control signal actuation. This versatility ensures compatibility with a broad spectrum of field instruments, sensors, and actuators, making it a versatile solution for diverse industrial applications. Additionally, the controller supports **fail-safe and safety interlocking functions**, which are critical for applications requiring high levels of operational safety, such as those in pharmaceutical, food and beverage, or hazardous material handling environments.

The 1771-LC1/B is also designed with **advanced diagnostic and troubleshooting tools**, including built-in fault detection, alarm logging, and self-test capabilities, which help minimize downtime by alerting maintenance personnel to potential issues before they escalate. Its **configurable control logic** allows engineers to fine-tune parameters such as gain, reset time, and derivative action to optimize performance for specific process dynamics, while its **scalability** enables easy expansion through additional loop controllers or integration with higher-level supervisory systems. Whether deployed in a new installation or as part of a retrofitted control system, the 967306-01 1771-LC1/B delivers a blend of reliability, precision, and adaptability, making it a trusted workhorse in industrial automation for decades.

### **Pros and Cons of buying a Allen-Bradley Foxboro 967306-01 (1771-LC1/B Loop Controller)**

#### **Pros**

1. **Compatibility and Integration** The 1771-LC1/B is a well-established loop controller designed for integration with Allen-Bradley (Rockwell Automation) control systems, including PLCs like the SLC 500, PLC-5, and later Logix platforms. It supports Modbus, DH-485, and other communication protocols, making it versatile for industrial automation.

2. **Reliability and Proven Performance** As a legacy Foxboro controller (later acquired by Invensys and Rockwell Automation), this unit has a strong track record in process control applications, particularly in industries like oil & gas, chemical processing, and manufacturing. Its analog loop control capabilities are robust for temperature, pressure, flow, and level applications.

3. **Analog Loop Control** The device is specifically designed for 4-20mA loop control, which is a standard in industrial automation. It can handle PID control, alarming, and scaling, making it suitable for field instrumentation where direct analog signaling is required.

4. **Modular and Expandable** The 1771-LC1/B can be part of a larger 1771 series system, allowing for expansion with additional I/O modules, communication adapters, or other controllers. This modularity can be beneficial for growing or complex control systems.

5. **Legacy Support** Since this is a well-documented and widely used controller, finding spare parts, manuals, and technical support (especially from Rockwell Automation or third-party suppliers) is relatively easier compared to newer or discontinued models.

6. **Cost-Effective for Specific Applications** For applications where analog loop control is required and a full PLC may be overkill, the 1771-LC1/B can be a cost-effective solution. It eliminates the need for additional I/O modules on a PLC, reducing hardware complexity.

7. **Compatibility with HMI and SCADA** It can interface with Allen-Bradley PanelView HMIs or third-party SCADA systems, allowing for monitoring and control from a centralized interface.

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#### **Cons**

1. **Obsolete Technology** The 1771-LC1/B is a legacy device, meaning it is no longer actively supported by Rockwell Automation. Newer Allen-Bradley controllers (e.g., CompactLogix, ControlLogix) offer advanced features like Ethernet/IP, higher resolution, and built-in safety functions that this unit lacks.

2. **Limited Communication Options** While it supports DH-485 and Modbus, it lacks modern communication protocols like Ethernet/IP, Profibus, or wireless connectivity. This can be a limitation in newer control architectures that rely heavily on IP-based networks.

3. **No Built-In Safety Features** Unlike modern controllers, the 1771-LC1/B does not support safety protocols such as Safety over Ethernet/IP or Safety PLC integration. Applications requiring safety certification (e.g., ISO 13849, IEC 61508) would need additional safety relays or controllers.

4. **Hardware Limitations** The unit has a fixed number of analog inputs/outputs (typically 2-4 loops, depending on the variant) and lacks the flexibility of modern PLCs, which can handle hundreds of I/O points with expandable modules. This can be restrictive for large or complex systems.

5. **Deprecated Software and Drivers** Programming and configuration software for the 1771-LC1/B may no longer be available or may require compatibility modes in older versions of RSLogix or FactoryTalk. Newer software tools may not support it at all.

6. **Higher Long-Term Maintenance Costs** Since the device is outdated, finding trained technicians familiar with its operation may be difficult. Additionally, replacement parts (e.g., power supplies, communication modules) could become harder to source over time.

7. **Lack of Advanced Features** Modern controllers offer features like predictive maintenance, advanced diagnostics, remote troubleshooting, and integration with cloud-based systems. The 1771-LC1/B lacks these capabilities, making it less suitable for smart factory or Industry 4.0 applications.

8. **Potential Compatibility Issues with Newer Systems** Integrating this controller with modern SCADA, MES, or ERP systems may require additional gateways or adapters, adding complexity and cost.

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### **Conclusion**

The **Allen-Bradley Foxboro 1771-LC1/B (967306-01)** is a reliable and functional analog loop controller for specific applications where 4-20mA signaling is required and a full PLC is unnecessary. It excels in legacy industrial environments where compatibility with older systems is critical, and its simplicity may reduce maintenance overhead for straightforward control tasks.

However, its **obsolete status, lack of modern communication protocols, and limited scalability** make it unsuitable for new installations or applications requiring advanced features, safety certifications, or IP-based networking. For modern industrial automation, newer Allen-Bradley controllers (e.g., CompactLogix, ControlLogix, or even smaller microcontrollers like the 1769 series) would be more appropriate due to their flexibility, support, and future-proofing.

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### **Recommendation**

- You are maintaining or upgrading a legacy system where this controller is already in use.

- The application requires only analog loop control (e.g., temperature, pressure, or flow control) without the need for advanced features.

- You have a budget constraint and the device is readily available at a reasonable price.

- You are not planning to expand the system significantly in the near future.

- You are starting a new project and need modern communication (Ethernet/IP, wireless), safety features, or scalability.

- You require integration with cloud-based systems, advanced diagnostics, or Industry 4.0 capabilities.

- You anticipate future upgrades or expansions that would benefit from a more flexible platform.

- You cannot source spare parts or technical support long-term.

- For **analog loop control in a modern system**, consider using a **CompactLogix or ControlLogix PLC** with analog I/O modules. These can handle loop control while offering Ethernet/IP, remote I/O, and advanced programming.

- For **simpler analog control**, a **micro800 or micro850 controller** (Rockwell s compact PLC line) may suffice if the application does not require full PLC capabilities.

- If the application is **strictly analog and cost-sensitive**, a **third-party analog controller** (e.g., from Siemens, Schneider Electric, or Emerson) might offer better long-term support than a legacy Allen-Bradley unit.

Ultimately, weigh the **cost of ownership, long-term support, and future compatibility** against the immediate needs of your application before making a decision.

Details:

Allen Bradley Foxboro, Loop Controller, Part No. 1771-LC1/B, Invensys Process Systems. 967306-01, Cat.

part #: 96730601 prices

• $260.00-$425.00

specifications pneumativalv:

• brand: Allen Bradley Foxboro
• mpn: 967306-01
• part type: Controller

returns pneumativalv:

• time: 30 Days
• method: Money back
• policy: Returns Accepted
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seller pneumativalv:

• city: Chattanooga, Tennessee
• rating: 100.0%
• # reviews: 405

offer pneumativalv:

• sold: 0
• availability: In Stock
• best offers: True
• options: Ship-to-home
• started: May 6, 2026
• quantity: 1

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• carrier: UPS, USPS

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• condition: Used
• Pump Flow Controllers > Flow Controllers Meters > Mass Flow Controllers

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