SQUARE D DLM120 Data Logger Controller Keys

( Brand: Square D ), ( Manufacturer Part Number: DLM120 ), ( Part Type: Data Controller )

Review SQUARE D Squaredlm120 Series Data Logger Controller Keys

The **DLM120 Data Logger Controller** from Square D (now part of Schneider Electric) is a robust, high-performance industrial-grade device designed to provide precise monitoring, control, and data acquisition for a wide range of electrical and environmental applications. Engineered for reliability in demanding environments, this compact yet powerful controller combines advanced metering capabilities with flexible communication interfaces, making it an ideal solution for facilities requiring real-time energy management, fault detection, and automated reporting. With a focus on accuracy and efficiency, the DLM120 features a high-resolution analog-to-digital converter (ADC) that delivers precise measurements of voltage, current, power, energy, and harmonic distortion, ensuring data integrity even under fluctuating load conditions. Its modular design allows for easy integration with existing systems, whether in commercial buildings, industrial plants, or renewable energy installations, while its intuitive programming interface simplifies configuration for engineers and technicians.

At the heart of the DLM120 s functionality lies its sophisticated **DLM120 Controller Keys**, a set of programmable keys that enable seamless user interaction, remote control, and automated responses to predefined conditions. These keys serve multiple purposes, from initiating manual data logging and parameter adjustments to triggering alarms or initiating corrective actions based on real-time thresholds. Each key can be customized to perform specific tasks, such as toggling between measurement modes, resetting fault conditions, or even initiating a full system reboot all without requiring physical access to the device. The keys are designed with a durable, ergonomic layout, ensuring ease of use in environments where quick responses are critical, while their backlit display enhances visibility in low-light conditions. Additionally, the DLM120 supports **Modbus RTU, Modbus TCP, and DNP3** communication protocols, allowing for seamless integration with SCADA systems, building management platforms, and enterprise energy management software, thereby enabling centralized monitoring and analytics across distributed networks.

Beyond its core metering and control functions, the DLM120 excels in **energy efficiency and fault diagnostics**, providing detailed insights into power quality issues such as voltage sags, swells, transients, and harmonic distortions. Its built-in **event logging** captures critical incidents with timestamps and severity levels, while **trend analysis** tools help users identify patterns in energy consumption, equipment performance, or potential failures before they escalate. The device also supports **remote firmware updates**, ensuring that users benefit from the latest enhancements and security patches without disrupting operations. Whether deployed in a data center, manufacturing facility, or renewable energy microgrid, the DLM120 s combination of **high-precision metering, programmable control keys, and robust communication** makes it a versatile and indispensable tool for modern infrastructure management. Its compact yet rugged construction further ensures longevity in harsh industrial settings, delivering consistent performance year after year.

**Pros and Cons of Buying a Square DLM120 Data Logger Controller with Keys**

The Square DLM120 is a programmable logic controller (PLC) designed for industrial automation, offering flexibility in control and data logging. Below is a detailed breakdown of its advantages and disadvantages.

### **Pros**

1. **Programmability and Flexibility**

The DLM120 supports ladder logic programming, allowing users to customize control logic for various applications. This makes it adaptable to different automation tasks, from simple relay control to more complex sequences.

2. **Built-in Data Logging Capabilities**

The device includes a data logger function, enabling real-time monitoring and historical recording of process variables. This feature is valuable for troubleshooting, performance analysis, and compliance reporting.

3. **Compact and Modular Design**

The DLM120 is a compact PLC with integrated I/O, reducing the need for additional rack-mounted equipment. Its modular design allows for easy expansion with optional input/output modules.

4. **User-Friendly Interface**

The controller features a built-in LCD display and keypad, simplifying setup, programming, and monitoring without requiring external HMI devices for basic operations.

5. **Cost-Effective for Small to Medium Applications**

Compared to larger industrial PLCs, the DLM120 offers a balance of functionality and affordability, making it suitable for small-scale automation projects or applications where high-end PLCs are overkill.

6. **Local and Remote Monitoring**

While primarily a local controller, some models support basic communication protocols (e.g., RS-485), allowing for limited remote monitoring or integration with other devices.

7. **Reliability for Basic Automation Tasks**

For applications requiring stable, low-maintenance control (e.g., HVAC systems, simple machinery, or process monitoring), the DLM120 provides dependable performance.

---

### **Cons**

1. **Limited Scalability**

The DLM120 is not designed for large-scale industrial automation. Users requiring extensive I/O expansion, advanced networking, or high-speed processing may need to upgrade to a more robust PLC system.

2. **Basic Communication Protocols**

While it supports RS-485, the DLM120 lacks advanced communication features like Ethernet, Modbus TCP, or Profibus, which are essential for integration with modern SCADA systems or cloud platforms.

3. **Programming Limitations**

The ladder logic programming environment, while intuitive, may be restrictive for complex algorithms or advanced control strategies. Users with sophisticated automation needs may find the software limiting compared to PLCs with graphical programming (e.g., Structured Text, Function Block Diagrams).

4. **No Built-in Web Server or Cloud Connectivity**

Unlike newer PLCs, the DLM120 does not offer built-in web server functionality or direct cloud connectivity. Remote access and data visualization typically require additional hardware or software.

5. **Dependence on Local Interface**

Without external HMIs or communication modules, users must rely on the onboard keypad and display for configuration and monitoring. This can be cumbersome for large systems or distributed installations.

6. **Limited Documentation and Community Support**

As a niche product, the DLM120 may have less extensive documentation, tutorials, or community support compared to widely used PLC brands like Siemens, Allen-Bradley, or Mitsubishi. Troubleshooting or finding third-party resources can be more challenging.

7. **Potential for Obsolescence**

The DLM120 is not part of a major PLC manufacturer s lineup, which could lead to longer lead times for parts or eventual discontinuation. Users should consider long-term availability before purchasing.

---

### **Conclusion**

The Square DLM120 is a practical choice for small to medium-sized automation projects where cost, simplicity, and basic data logging are priorities. It excels in applications requiring straightforward control logic, local monitoring, and minimal expansion needs. However, for users demanding advanced communication, scalability, or integration with modern industrial networks, the DLM120 s limitations may outweigh its benefits.

- Simple relay control,

- Local data logging for process monitoring,

- A budget-conscious approach,

- Minimal I/O requirements,

then the DLM120 is a viable option. However, if you anticipate growth, require advanced networking, or need complex programming capabilities, investing in a more scalable PLC (e.g., a Siemens S7-1200, Allen-Bradley Micro800, or Mitsubishi FX series) would be more future-proof.

### **Recommendation**

- Your application is small-scale and does not require extensive I/O or advanced networking.

- You prioritize affordability and simplicity over long-term scalability.

- You are comfortable with basic ladder logic programming and local monitoring.

- You need Ethernet, Modbus TCP, or other modern communication protocols.

- Your project requires high-speed processing, extensive expansion, or integration with cloud platforms.

- You anticipate future upgrades or complex automation tasks that may exceed the PLC s capabilities.

For most modern industrial applications, pairing the DLM120 with additional communication modules or considering a more versatile PLC may be worth the investment for long-term flexibility.

Details:

Square Data Logger Controller, DLM120. 2 lb 14.4 oz 51426 QTY: 1 With Keys condition: Used, Good working Condition.

part #: dlm120 prices

• $25.50-$50.00

specifications sensoindustria:

• brand: Square D
• mpn: Dlm120
• part type: Data Controller

seller sensoindustria:

• rating: 100.0%
• # reviews: 10385
• city: York, South Carolina

returns sensoindustria:

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

offer sensoindustria:

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

payments sensoindustria:

• other
• credit card: Mastercard
• wallet: Apple-pay

shipping sensoindustria:

• class: Standard, Expedited
• cost: $18.95
• type: Calculated
• carrier: USPS, FedEx
• transit: 4-9 Days
• service: USPS Ground Advantage, USPS Priority Mail, FedEx Ground / FedEx Home Delivery

general sensoindustria:

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

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